a) The tension is 76.9 lb when the balloon rises with v=0.8t ft/s and b) The tension is 74.1 lb when the balloon descents with v = 0.4t ft/s.
What is Newton's second law?Newton's second law, states that the net force on an object is equal to its mass times its acceleration.
We can apply Newton's second law to the man and the balloon separately to determine the tension in each of his hands.
a) The net force on the balloon is equal to its mass times its acceleration, which is given by:
F(b) = mg + ma = mg + m(dv/dt)
= mg + m(d/dt(0.8 ft/s)
= (mg + 0.8m)/2
= [150 lb + (150b/32 ft/s²)(0.8 ft/s)]/2
T = 76.86 lb or 76.9 lb
b) When the balloon descends with a velocity of 0.4t ft/s, its acceleration is -0.4 ft/s² (negative because it is descending).
The net force on the man is still equal to the tension in his hands, which we can call T. Therefore:
T = m(m) × g - F(b)
where m(b) is the mass of the balloon, r is its radius, and ρₐ is the density of air,.
T = 150 lb × 32.2 ft/s² - (4/3)πr³ × ρₐ × 0.4 ft/s²
Dividing the tension equally between the man's hands, we get:
T(h) = T/2 = 75 lb × 32.2 ft/s² - (2/3)πr³× ρₐ × 0.4 ft/s²
Substituting the value of r and ρₐ, we get:
T(h) = 74.1 lb
Therefore, the answer is option 4) a) T=76.9 lb, b) T=74.1 lb.
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Fill in the blank: in tableau, a diverging palette displays two value ranges. It uses a color to show the range where a data point is from and color intensity to show its ______.
In Tableau, a diverging palette displays two value ranges. It uses a color to show the range where a data point is from and color intensity to show its magnitude.
A diverging palette in Tableau shows two value ranges. A colour is used to indicate the range from which a data point comes, and a color's intensity to indicate the size of that range.For example, if we have a data set that shows the difference in temperatures between two cities, a diverging color palette can be used to represent the temperature difference. The color of each data point will indicate whether the temperature difference is positive or negative, while the intensity of the color will represent the magnitude of the difference. This can make it easier to visualize and understand the data, particularly when there are large differences in the values being compared.for such more question on range
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A positive test charge is brought near to, but not touching a conducting sphere that is connected to the ground. Both objects remain at rest in the positions shown above. Charge begins to flow from the ground to the sphere. Which of the following statements best describes when charge stops flowing and provides justification for the claim? Charge will flow until the electric field at the surface of the sphere is equivalent to the electric field of the test charge, because then the excess charge on the surface of the sphere will be equal to the charge of the test charge Charge will flow until the electric field at the surface of the sphere is equivalent to the electric field of the test charge, because then the net force on all charges on the surface of the sphere will be zero Charge will flow until the potential at the surface of the sphere is the same as the potential of the test charge, because then the net force on all charges on the surface of the sphere will be zero. Charge will flow from the ground to the sphere until the potential is the same everywhere within the sphere, because then the excess charge on the surface of the sphere will be equal to the charge of the test charge. Charge will flow from the ground to the sphere until the potential is the same everywhere within the sphere, because then the net force on all charges on the surface of the sphere will be zero
The correct statement is option - {D} : Charge will flow from the ground to the sphere until the potential is the same everywhere within the sphere, because then the net force on all charges on the surface of the sphere will be zero
What is a conducting sphere?A conducting sphere will have the complete charge on its outside surface and the electric field intensity inside the conducting sphere will be zero.For a spherical charged shell the entire charge will reside on outer surface and again there will be no field anywhere inside itGiven is a positive test charge is brought near to, but not touching a conducting sphere that is connected to the ground. Both objects remain at rest in the positions shown above. Charge begins to flow from the ground to the sphere
When charge stops flowing, charge will flow from the ground to the sphere until the potential is the same everywhere within the sphere, because then the net force on all charges on the surface of the sphere will be zeroTherefore, the correct statement is option - {D} : Charge will flow from the ground to the sphere until the potential is the same everywhere within the sphere, because then the net force on all charges on the surface of the sphere will be zero
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A physics student performed an experiment in which the potential difference V between the ends of a long straight wire was varied. The current I in the wire was measured at each value of the potential difference with an ammeter and the results of the experiment are shown in the table.
Which one of the following statements is the best conclusion based on the data?
a The wire obeys Ohm's law over the range of potential differences between 5 and 30 V.
b The wire obeys Ohm's law over the range of potential differences between 5 and 20 V.
c The resistance of the wire is 20 Ω.
d The wire does not obey Ohm's law.
e The current in the wire is directly proportional to the applied potential difference.
(a) The wire Obeys over the range differences of Ohm's law Potential between 5 & 20 V.
What is Ohm's law?The relationship between current, voltage, and resistance is described by Ohm's law. The voltage or potential difference across a large number of materials determines how much constant current flows through them.
Given, A table of voltage and current shown in the picture below:
Ohm's law states that the current through a conductor between two points is directly proportional to the voltage across the two points, and the constant of proportionality is the resistance of the conductor. In other words, Ohm's law can be expressed as:
V = IR
where V is the potential difference across the conductor,
"I" is the current flowing through the conductor,
and R is the resistance of the conductor.
A) V =IR for Voltage, 5 - 20V it obeys. The range between Ohm's law Over on the potential differences. 5 & 20v, So This option is true
B) You Can't Say that Resistance the Range 5 -40 after 20 V Changes, Check it, at 25
dV/ dI = (25 -20)/(1.5 -1) = 10 ohm
C) Since Obey's accuracy, is not within 5V-20V it is Ohm's law with good this option is not true.
D) After 20V this option is not true also.
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Complete question:
Once ______ is locked, pain causing chemicals cannot transmit their messages.
Once the nerve cell membrane is locked, pain causing chemicals cannot transmit their messages.
What is the membrane ?The membrane is a thin, selective barrier which separates two distinct environments. It is the most fundamental structural and functional element of all living cells, regulating the passage of molecules into and out of the cell. Membranes are composed of a lipid bilayer and proteins. The lipid bilayer is made of phospholipids, which are amphipathic molecules, meaning they have both hydrophilic (water-attracting) and hydrophobic (water-repelling) regions. The membrane proteins embedded in the lipid bilayer provide the cell with selective permeability, allowing for the controlled passage of molecules into and out of the cell, and providing an effective barrier to the external environment. The proteins also provide receptors for signaling molecules, enzymes for metabolic reactions, and a scaffold for organizing the cell’s internal architecture.
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a 5.0 kg block accelerates a .80 m/s2 along a horizontal surface when a horizontal 12.0 N force acts on it. Show that the force of friction on the block is 8.0 N
The value of the frictional force acting on the block will be equal to 8 N.
How to get the frictional force?Force is defined as the product of mass and acceleration, and it acts on the body to move it.
Because an external force is acting on the block, a frictional force opposes the block's movement. The frictional force is denoted by f(k) and is given by
f(k) = external force - (ma)
f(k) = 12N - (5×0.8)
f(k) = 12- 4
f(k) = 8 N
f(k) = 8 N and since it opposes the external force then the sign will be negative that is f(k) = -8N.
Therefore, the frictional force will be 8 N.
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A 1.67m wooden beam that weighs 100 pounds is resting on two supports. The first support is 0.2 m from one end of the beam, and the second support is 0.3 m from the other end. Assume the axis of rotation would be the center of the beam
a. Find the torques acting on the wooden beam
b. Find the net torque acting on the wooden beam
The torque acts on a distance of 0.2 m from one end of the beam is 88.96 Nm and the torque acting upon a the distance of 0.3 m from the other end of the beam is 133.4 Nm. Then, the net torque of the mass is 44.48 Nm.
What is torque ?Torque is the rotational analogue of force on an object. It is the measure of force that acts on the object to rotate the object about an axis.
It is the cross product of force and distance from the end of axis. Torques generates the angular momentum in the object.
Given the mass m= 100 pounds.
1 pound = 4.448 N
then Force by the weight F = 100 × 4.448 = 444.8 N.
Then, the torque acts over 0.2 m from one end = F .r = 444.8 × 0.2 = 88.96 Nm.
Then, the torque acts over 0.3 m from one end = F .r = 444.8 × 0.3 = 133.4 Nm.
Therefore, the net torque acting on the mass is 133.4 -88.96 = 44.48 Nm.
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Vector E is 0.111m long in a 90 degree direction. Vector F if 0.234m long in 300 degree direction. Find the magnitude of their vector sum
The magnitude of their vector sum is 0.149 m.
What is magnitude?
Magnitude is a measure of the size or intensity of a physical quantity. It can refer to the size of an earthquake, the brightness of a star, the intensity of a hurricane, or any other physical quantity that can be measured in size or intensity.
Ex = Ecose (0.111) cos90° = 0 =
Ey Esino (0.111)sin90° 0.111m =
And
Fr=Fcose (0.234) cos300° 0.117m = Fy = Fsin0 (0.234) sin300°-0.203m
So the components of the vector sum are
Rr Ex+Fr=0+0.1170.117m =
Ry = EyFy 0.111 -0.203-0.092m
The magnitude of the vector sum is
R= |R² + R² = √(0.117)2 + (−0.092)2 = 0.149m
Therefore, The magnitude of their vector sum is 0.149 m.
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Which of the following best describes energy transfer in a closed system?
The best description of energy transfer in a closed system is that it occurs within the system and does not involve any exchange of energy with the surroundings.
What is Energy?
Energy is a property of objects or systems that can be transferred to other objects or systems, or converted into different forms. It is a scalar physical quantity that can be defined as the ability to do work or produce heat. Energy exists in many forms, such as mechanical, thermal, electrical, chemical, nuclear, and electromagnetic, and can be transformed from one form to another. The SI unit of energy is the joule (J), but other units such as the calorie (cal) or the electronvolt (eV) are also commonly used in different contexts.
In a closed system, energy transfer occurs between different parts of the system, but no energy is exchanged with the surroundings. Energy can be transformed from one form to another within the closed system, but the total amount of energy remains constant. Therefore, the best description of energy transfer in a closed system is that it occurs within the system and does not involve any exchange of energy with the surroundings.
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You are driving along the road at 30 m/s, when you notice a deer in the road 40m in front of you. You immediately slam on the breaks and experience acceleration of -10 m/s.
a) Where would you come to a stop if the deer were not in your way?
b) How fast are you going when you reach the deer’s position?
c) how long does it take you to get there?
Luckily this is one smart deer. The deer runs to the side and needs to move a minimum of 1.2 meters to avoid being hit. What acceleration of the deer is necessary to just avoid collision with your car?
a) The deer were not in your way, you would come to a stop after traveling 45 meters.
b) You are going 10 m/s (or approximately 36 km/h) when you reach the deer's position.
c) It takes you 2 seconds to get to the deer's position.
d) The acceleration will be -0.6m/s
How The answer was obtaineda) To calculate where you would come to a stop if the deer were not in your way, we can use the following kinematic equation:
v^2 = u^2 + 2as
0^2 = 30^2 + 2(-10)s
0 = 900 - 20s
20s = 900
s = 45
Therefore, if the deer were not in your way, you would come to a stop after traveling 45 meters.
b) To calculate how fast you are going when you reach the deer's position, we can use the same kinematic equation as in part a, but this time we want to solve for the final velocity (v):
v^2 = u^2 + 2as
v^2 = 30^2 + 2(-10)(40)
v^2 = 900 - 800
v^2 = 100
v = 10 m/s
Therefore, you are going 10 m/s (or approximately 36 km/h) when you reach the deer's position.
c) To calculate how long it takes you to get to the deer's position, we can use another kinematic equation:
s = ut + (1/2)at^2
40 = 30t + (1/2)(-10)t^2
20t^2 - 30t + 40 = 0
Using the quadratic formula, we get:
t = [30 ± sqrt(30^2 - 4(20)(40))] / (2(20))
t = [30 ± sqrt(100)] / 40
t = 1 or 2
We take the positive root, t = 2, because we are interested in the time it takes you to get to the deer's position after you start braking. Therefore, it takes you 2 seconds to get to the deer's position.
d) To calculate the acceleration of the deer necessary to just avoid collision with your car, we can use the following kinematic equation:
s = ut + (1/2)at^2
1.2 = ut + (1/2)at^2
We know that the initial velocity of the deer is likely greater than zero, since it is not stationary in the road, so we can't simply use u = 0. However, we can estimate u based on the time it takes for the deer to move 1.2 meters out of the way. If we assume that the deer moves at a constant acceleration, then the final velocity of the deer when it has moved 1.2 meters is:
v = u + at
We know that v = 0 (since the deer comes to a stop after moving 1.2 meters), and we know t = 2 (since this is the time it takes for the car to reach the deer's original position). Therefore:
0 = u + a(2)
u = -2a
Substituting this into the previous equation we have:
s = ut+(1/2)at^2
1.2 = -2a*2 +(1/2)a * 2^2
= -0.6m/s
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Select the statement(s) that accurately describe why people have to prepare for natural disasters.
1. People have to prepare for natural disasters in order to reduce the risk of injury, death, and property damage caused by the disaster.
What is natural disasters?Natural disasters are adverse events that occur naturally and are a result of the interaction between the physical environment and human activities. They can include floods, hurricanes, tornadoes, earthquakes, tsunamis, wildfires, landslides, volcanic eruptions, and extreme weather events. Natural disasters can have devastating impacts on communities, including loss of life, damage to property, displacement, and destruction of livelihoods. Governments, organizations, and individuals are increasingly working to reduce the impacts of natural disasters through improved risk management, infrastructure planning, and disaster response and recovery efforts.
2. People have to prepare for natural disasters in order to be able to respond quickly and efficiently in the event of an emergency.
3. People have to prepare for natural disasters in order to plan for the financial impacts of the disaster.
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A student sits on a rotating stool holding two
3 kg objects. When his arms are extended
horizontally, the objects are 1 m from the
axis of rotation, and he rotates with angular
speed of 0.64 rad/sec. The moment of inertia
of the student plus the stool is 8 kg m2
and is assumed to be constant. The student then
pulls the objects horizontally to a radius 0.3 m
from the rotation axis.
The student's final angular speed is roughly 0.60 radians per second.
What is an object's angular speed?The speed of an object in rotation is known as its angular speed. In radians, the distance traveled is denoted by the symbol. The amount of time is expressed in seconds. The angular speed is therefore expressed in radians per second, or rad/s.
This issue can be resolved using the conservation of angular momentum:
L = Iω
The student and the two objects initially have the following angular momentum:
L1 = (2 × 3 kg) × (1 m) × (0.64 rad/sec) = 3.84 kg m²/s
The moment of inertia of the student plus the stool is given as I = 8 kg m
I' = I + 2mr²
where m is the mass of each object (3 kg), and r is the new radius (0.3 m).
I' = 8 kg m² + 2 × 3 kg × (0.3 m)² = 8.54 kg m²
L1 = L2
I1 ω1 = I2 ω2
8 kg m² × 0.64 rad/sec = 8.54 kg m² × ω2
ω2 = (8 kg m² × 0.64 rad/sec) / (8.54 kg m²) = 0.60 rad/sec.
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when two objects slide against one another, which of the following statements about the force of friction between them is true?
Friction is the pressure that happens when two objects rub together. Microscopic bumps on the surface of each object obstruct the action of the different as the surfaces slide throughout one another.
What is the force of friction between the two objects?Friction is constantly contrary to the course of motion. The frictional pressure between two surfaces in attempting to slide one object throughout the different however neither objects are transferring with admire to every other. The friction is usually equal to the internet force parallel to the surface.
What type of pressure is when one object is sliding across another?We can outline sliding friction as the resistance created by using any two objects when sliding against each other. This friction is also recognised as kinetic friction and is defined as the pressure that is needed to keep a surface sliding along any other surface.
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A student sits on a rotating stool holding two
3 kg objects. When his arms are extended
horizontally, the objects are 1 m from the
axis of rotation, and he rotates with angular
speed of 0.64 rad/sec. The moment of inertia
of the student plus the stool is 8 kg m2
and
is assumed to be constant. The student then
pulls the objects horizontally to a radius 0.3 m
from the rotation axis.
part A. The final angular speed of the student is 1.28 rad/s.
part B. The change in kinetic energy of the system is 7.04 J.
How do we calculate?We have that the moment of inertia of the system is assumed to be constant, we then write:
Iω = I'ω'
The moment of inertia of the objects is written in the form of :
I_objects = 2MR^2
Therefore, the initial moment of inertia is gotten as:
I = M_student R_stool^2 + 2MR^2
The final moment of inertia is gotten as:
I' = M_student R_stool^2 + 2M(0.3)^2
The angular momentum is conserved, we ten have:
Iω = I'ω'
Solving for ω', we get:
ω' = (Iω)/(I') = ω (I/I')
ω' = 0.64 rad/s (M_student R_stool^2 + 2MR^2) / (M_student R_stool^2 + 2M(0.3)^2)
ω' = 1.28 rad/s
part b.
The initial kinetic energy is
K = 1/2 I ω^2
K = 1/2 (8 kg m^2) (0.64 rad/s)^2 = 1.6384 J
The final kinetic energy is given by:
K' = 1/2 I' ω'^2
K' = 1/2 (8 kg m^2 + 2(3 kg)(0.3 m)^2) (1.28 rad/s)^2 = 8.6784 J
The change in kinetic energy is therefore calculated as:
ΔK = K' - K = 8.6784 J - 1.6384 J = 7.04 J
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WORTH 40 POINTS!!
Label the following topographic map. Click on a label below the map to select it, and then click on the appropriate box on the map to place the label. (Increments for contour lines is 50 ft).
1.) River flow east
2.) Depression
3.) 2650 feet
4.) 3300 feet
5.) Steep area
1.) River flow east - The arrow pointing east in the lower right corner of the map indicates that the river flows east.
What is River flow?River flow is the movement of water through a river. It is the result of rainfall, melting snow and ice, and other sources of water such as groundwater. River flow is an important part of the water cycle and it is an essential component of many ecosystems. River flow affects the transport of sediment and nutrients, the formation of wetlands, and the formation of landforms such as floodplains, estuaries and other features.
2.) Depression - The area labelled "Depression" on the map is the area between two contour lines (2650 ft and 2800 ft).
3.) 2650 feet - The label "2650 ft" is placed on the contour line that is at 2650 feet.
4.) 3300 feet - The label "3300 ft" is placed on the contour line that is at 3300 feet.
5.) Steep area - The area labelled "Steep area" on the map is the area between two contour lines (3000 ft and 3250 ft). This area is steeper than the other areas on the map and would indicate a steep area.
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Kepler's second law, which states that as a planet moves around its orbit it sweeps out equal areas in equal times, implies that A) a planet travels faster when it is nearer to the Sun and slower when it is farther from the Sun. B) planets have circular orbits. C) the period of a planet does not depend on its mass. D) planets that are farther from the Sun move at slower average speeds than nearer planets. E) a planet's period does not depend on the eccentricity of its orbit.
Answer: an object's orbital speed is faster when nearer to the Sun and slower when farther away
Explanation:
Kepler's second law, which states that as a planet moves around its orbit, it sweeps out equal areas at equal times, implies that a planet travels faster when it is nearer to the sun and slower when it is farther from the sun, which is option a.
Kepler states that when a planet gets closer to the sun in its orbit, it generally covers a greater distance in a given amount of time, resulting in a higher speed. On the other hand, at the same time, the planet moves a small distance when it is farther from the sun. Here the Kepler second is explained.
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Give the SI base unit of each of these quantities Enter the abbreviation rather than the name of the unit: time: mass: Kg length:m
Time: s (second)
Mass: kg (kilogram)
Length: m (meter)
What are the SI units?The SI units (International System of Units) are a standard system of measurement used in science, engineering, and many other fields. They provide a universal language for expressing and comparing measurements. The SI units are based on seven fundamental physical quantities, and each of these quantities is associated with a specific base unit, which is defined independently of any other unit.
Seven base units of the SI system are:
Length: meter (m)
Mass: kilogram (kg)
Time: second (s)
Electric current: ampere (A)
Temperature: kelvin (K)
Amount of substance: mole (mol)
Luminous intensity: candela (cd)
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In a 41 s interval, 580 hailstones strike a glass window of area 1.346 m2 at an angle 31◦ to the window surface. Each hailstone has a mass of 7 g and speed of 6.7 m/s. If the collisions are elastic, find the average force on the window. Answer in units of N.
Answer:
N = hailstones / sec = 580 / 41 = 14.1 stones / sec
mass = .007 kg
v = 6.7 m/s * sin 31 = 3.45 speed of stones perpendicular to surface
Δp = 2 m Δv change in momentum dur to striking window
F = N Δp force required to repel hailstones
F = 2 N m Δv = .68 N force on window pane
Pressure = force / area (don't need window area for force)
zhangjin xu the jet engine of an airplane takes in 120 kg of air per second, which is burned with 4.2 kg of fuel per second. the burned gases leave the plane at a speed of 550 m/s (relative to the plane). If the plane is traveling 270 m/s (600 mi/h ), determine the following quantities. Part A - The thrust due to ejected fuel. Part B - The thrust due to accelerated air passing through the engine. Express your answer using two significant figures. Part C - The power (hp) delivered. Express your answer using two significant figures.
Therefore, the thrust due to ejected fuel is 2310 N, the thrust due to accelerated air passing through the engine is 98340 N, and the power delivered is 3260 hp.
What is acceleration?Acceleration is the rate of change of velocity of an object with respect to time. It is a vector quantity, meaning that it has both magnitude and direction. Acceleration occurs when an object changes its speed, its direction, or both. A positive acceleration means that the speed of an object is increasing, while a negative acceleration (also called deceleration) means that the speed of an object is decreasing. The standard unit of acceleration is meters per second squared.
Here,
To solve this problem, we can use the principle of conservation of momentum, which states that the total momentum of a system is conserved when there are no external forces acting on it. In this case, we can assume that the airplane and the burned gases form a closed system, so the total momentum of the system is conserved.
Part A: To find the thrust due to ejected fuel, we can use the equation:
Thrust = (mass flow rate of fuel) x (exit velocity of burned gases)
Thrust = (4.2 kg/s) x (550 m/s) = 2310 N
Part B: To find the thrust due to accelerated air passing through the engine, we can use the equation:
Thrust = (mass flow rate of air) x (exit velocity of air) + (mass flow rate of fuel) x (exit velocity of burned gases)
The mass flow rate of air is 120 kg/s, and the exit velocity of air is the sum of the speed of the airplane and the speed of the air relative to the airplane. We can use the formula for the velocity addition to find the exit velocity of air:
exit velocity of air = speed of airplane + speed of air relative to airplane
exit velocity of air = 270 m/s + 550 m/s = 820 m/s
Now we can substitute the values into the equation:
Thrust = (120 kg/s) x (820 m/s) + (4.2 kg/s) x (550 m/s)
Thrust = 98340 N
Part C: To find the power delivered by the engine, we can use the equation:
Power = Thrust x Velocity
We can use the speed of the airplane as the velocity, since this is the speed at which the engine is delivering thrust to the airplane. The speed of the airplane is 270 m/s, which is equivalent to 603 mi/h. To convert the thrust from Newtons to pounds-force (lbf), we can divide by the conversion factor 4.448 N/lbf. Then we can use the following formula to convert the power from watts to horsepower:
1 hp = 746 W
Substituting the values into the equation, we get:
Power = (98340 N / 4.448 N/lbf) x (603 mi/h) / (3600 s/h) x (1 hp / 746 W)
Power = 3260 hp
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two speakers are emitting identical sound waves with a wavelength of 4.0 m. the speakers are 8.0 m apart explained
Explain the independent roles of the approach motivation and the avoidance motivation on producing feelings of contentment in a relationship.
Both approach and avoidance motivation can impact feelings of contentment in a relationship. Approach motivation can lead to positive feelings of contentment by promoting behaviors that enhance intimacy and closeness, while avoidance motivation can help prevent negative experiences.
Explain the term approach motivation.Approach motivation can lead to positive feelings of contentment in a relationship by driving individuals to seek out and engage in behaviors that promote intimacy, closeness, and positive interactions with their partner.
Explain the term avoidance motivation.Avoidance motivation can also impact feelings of contentment in a relationship, but in a different way. It can lead individuals to engage in behaviors that prevent or mitigate negative experiences in the relationship.
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Please help me find the final answer for this vectors problem!!
The magnitude of the sum of the vectors is 58.3 N.
What is resultant of the two vectors?The resultant of the two vectors is calculated by resolving the vectors as follows;
The sum of the x - component of the vectors is calculated as follows;
Vx = V cos (θ)
where;
V is the magnitude of the vectorVx is the x component of the vectorθ is the inclination of the vector above the horizontalVx = 30 cos (45) + 50 cos (45)
Vx = 56.57 N
The sum of the y - component of the vectors is calculated as follows;
Vy = 30 sin (45) - 50 sin (45)
Vy = -14.14 N
The magnitude of the sum of the vectors;
V = √ (56.56² + (-14.14²)
V = 58.3 N
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Please help will give 50 points and Brainly
Answer:
thanks for 50 points
Explanation:
!am sorry
Explain the independent roles of the approach motivation and the avoidance motivation in producing feelings of contentment in a relationship
Motivation sometimes really helpful to a person when he or she confuses for the next step or hesitates in taking decisions. It helps to heal the problems in a relationship.
What is role of motivation?In psychology theory and research, the dichotomy between the drive to pursue rewards and the drive to avoid risks has a long and significant history.
For instance, Pavlov's description of two distinct systems that direct an organism towards or away from a stimulus prefigured more recent evidence from cognitive neuroscience that identifies various brain activity patterns related to the presentation of incentives and dangers.
The fact that approach and avoidance motives and goals are mostly independent of one another is a recurrent finding in research on these topics.
For instance, Gable, Reis, conducted a series of confirmatory component analyses on individual difference measures of approach and avoidance constructs to support a two-factor model of these constructs.
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Photons and photon flux a. Consider a 1 kW AM radio transmitter at 700 kHz. Calculate the number of photons emitted fro-m the antenna per second. b. The average intensity of sunlight on Earth's surface is about 1 kW m^-2. The maximum intensity is at a wavelength of around 800 nm. Assuming that all the photons have an 800 nm wavelength, calculate the number of photons arriving on Earth's surface per unit time per unit area. What is the magnitude of the electric field in the sunlight? c. Suppose that a solar cell device can convert each sunlight photon into an electron, which can then give rise to an external current. What is the maximum current that can be supplied per unit area (m^2) of this solar cell device?
The number of photons emitted per second is 2.16 x 10^28 photons/s. The magnitude of the electric field in the sunlight is 3.22 x 10^-5 V/m. The maximum current that can be supplied per unit area by the solar cell device is 1.29 microamperes per square meter.
How to find number of photons emitted per second?a. The energy of a single photon is given by E = hf, where h is Planck's constant and f is the frequency. We can find the frequency of the radio wave as follows:
f = 700 kHz = 700,000 Hz
The energy of a single photon at this frequency is:
E = hf = (6.626 x 10^-34 J s) x (700,000 Hz) = 4.64 x 10^-26 J
The power of the transmitter is 1 kW = 1000 J/s. Therefore, the number of photons emitted per second is:
(1000 J/s) / (4.64 x 10^-26 J/photon) = 2.16 x 10^28 photons/s
b. The energy of a photon with a wavelength of 800 nm can be calculated using the formula E = hc/λ, where h is Planck's constant, c is the speed of light, and λ is the wavelength.
We can then calculate the number of photons arriving on Earth's surface per unit time per unit area as follows:
E = hc/λ = (6.626 x 10^-34 J s) x (3.00 x 10^8 m/s) / (800 x 10^-9 m) = 2.48 x 10^-19 J
The number of photons arriving per unit time per unit area (i.e., the photon flux) is given by the intensity I divided by the energy of a single photon:
I = 1 kW/m^2 = 1000 J/s/m^2
Photon flux = I/E = (1000 J/s/m^2) / (2.48 x 10^-19 J/photon) = 4.03 x 10^21 photons/s/m^2
The magnitude of the electric field in the sunlight can be found using the formula I = ε0cE^2/2, where ε0 is the permittivity of free space and c is the speed of light:
E = sqrt(2I/ε0c) = sqrt(2 x 1000 J/s/m^2 / (8.85 x 10^-12 F/m x 3.00 x 10^8 m/s)) = 3.22 x 10^-5 V/m
c. The maximum current that can be supplied per unit area by the solar cell device is equal to the photon flux multiplied by the charge of an electron (q) and the efficiency of the solar cell (η):
I = ηqPhoton flux = ηq(4.03 x 10^21 photons/s/m^2)
The charge of an electron is q = 1.602 x 10^-19 C, and the efficiency of a typical silicon solar cell is around 20%. Therefore:
I = 0.2 x (1.602 x 10^-19 C) x (4.03 x 10^21 photons/s/m^2) = 1.29 x 10^-6 A/m^2
So, the maximum current that can be supplied per unit area by the solar cell device is 1.29 microamperes per square meter.
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A 1.17 kg book is held stationary in the hand. Find the forces acting on the book and the reaction forces to each of these. The hand now exerts an upward force of 14.9 N on the book. Find the book's acceleration. As the book moves upward, the hand is quickly removed from the book. Find the forces on the book and its acceleration
When the hand exerts an upward force of 14.9 N on the book, the book's acceleration is a = F/m = 14.9 N/1.17 kg = 12.7 m/s^2.
What is acceleration ?Acceleration is a measure of the rate of change of velocity of an object over time. It is a vector quantity and is measured in meters per second squared (m/s2). It is usually denoted by the symbol ‘a’. Acceleration can be positive, negative, or zero, depending on the direction of the change in velocity. Positive acceleration is an increase in velocity, negative acceleration is a decrease in velocity, and zero acceleration is no change in velocity.
The forces on the book when it is held stationary in the hand are the downward force of gravity (Fg = m*g = 1.17 kg * 9.8 N/kg = 11.5 N) and the upward force of the hand (Fh = 14.9 N). The reaction forces to these are the upward force of the hand (14.9 N) and the downward force of the book on the hand (11.5 N).
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A horizontal pipe of diameter 0.842 m has a smooth constriction to a section of diameter 0.5052 m . The density of oil flowing in the pipe is 821 kg/m3. If the pressure in the pipe is 7370 N/m2 and in the constricted section is 5527.5 N/m2, what is the rate at which oil is flowing?
A piece of a horizontal pipe with a diameter of 0.5052 m smoothly constricts from its diameter of 0.842 m. oil's viscosity as it flows through the pipe.
How does density work?How much "stuff" is contained in a specific quantity of space is determined by its density. For instance, a stone of the harder, light element gold Au will be heavier than a slab of the heavy element lead Pb. Styrofoam blocks are less dense than bricks. Mass per given volume serves as its definition.
Describe oil?Petroleum was created from the remains of extinct marine animals like plants, algae, and bacteria, just like coal and natural gas.
Oil is a thick, smooth fluid that is utilized as fuel and to move machine parts.
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an opaque spot called a may develop on the lens, which limits the amount of light transmitted into the eye.
An opaque spot called a cataract may develop on the lens, which limits the amount of light transmitted into the eye.
Describe the cataract?A cataract is described as a condition that affects the lens of the eye, causing it to become cloudy and opaque.
The lens is responsible for sending visual information to the brain, and also is described as a transparent structure in the eye that helps to focus light onto the retina.
Cataracts are most commonly associated with older people, but in some cases can be caused by other factors such as genetics, certain medical conditions.
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A data set of current new job openings in the banking industry is best shown in a _____________.
After the 2008 financial crisis, the banking sector was significantly weaker than it is today.
What exactly is finance?It is the act of directing various financial resources—such as credit, loans, and invested capital—to those parts of the economy that need them most or can use them most effectively.
Business financing is necessary for carrying out all other commercial transactions as well as for the acquisition of assets, goods, and raw materials.
Which city has the capital?Such as a plant and its equipment, patents, monetary assets of a company or an individual, or intellectual property. Whatever a company holds that helps create money is considered capital. Many sources of capital.
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Two vectors lie with their tails at the same point. When the angle between them is increased by 20 their scalar product has the same magnitude but changes from positivr to negative .the original angle between them was?
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The original angle between the two vectors was 20.91 degrees. when two vectors lie with their tails at the same point but change from positive to negative.
The angle between the vectors is increased by 20 degrees, their scalar product changes sign, we can set up the following equation:
cos(θ + 20) = -cos(θ)
cos(θ)cos(20) - sin(θ)sin(20) = -cos(θ)
cos(θ)(cos(20) + 1) = sin(θ)sin(20)
cot(θ) = -tan(20)
θ = tan⁻¹(-tan(20))
θ ≈ -20.91 degrees
Therefore, the original angle between the two vectors was 20.91 degrees.
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a turntable is rotating at 3313rpm . you then flip a switch, and the turntable speeds up, with constant angular acceleration, until it reaches 78rpm . part g suppose you are asked to find the amount of time t , in seconds, it takes for the turntable to reach its final rotational speed. which of the following equations could you use to directly solve for the numerical value of t ?
Once t can be located, more details are required.You would need further information (namely, the amount of the rotational motion ) before you could discover a numerical value for t; knowing and 0 would not be sufficient to enable you to solve for t.
What does rotation about just a fixed axis entail?When every particle in a body revolves in a circle around a single line, this is known as pure rotational motion.The rotational axis is this line.Then, at the same time, the same deflection occurs in all of the radii vectors from of the shaft to all of the particles.
What quantity is regarded when the rotation's axis is fixed—angular velocity?A spinning object's angular velocity is defined as a vector quantity in more sophisticated investigations of rotational motion.This vector has magnitude and points exteriorly along the axis of rotation for an object revolving anticlockwise about a fixed axis.
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