Their mass is small enough to produce a significant gravitational pull on your body due to inverse square law of gravity.
All objects in the universe exert a gravitational pull on each other, as described by Newton's law of universal gravitation. The magnitude of this force is proportional to the masses of the objects and the distance between them. However, in most cases, the force of gravity between everyday objects is too small to be noticeable.
The force of gravity between two people is determined by their masses and the distance between them. Since the masses of two people are relatively small compared to, say, the mass of the Earth, the gravitational force between them is negligible.
Furthermore, the distance between two people passing each other on the street is relatively large compared to their masses. The gravitational force between two objects decreases rapidly with distance, becoming very small at distances much larger than the size of the objects. Hence, the gravitational pull between two people passing each other on the street is too small to be felt or noticed.
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You are riding on a Ferris wheel that is rotating with a constant speed. The car in which you riding always maintain its correct upwards orientation; it does not invert. What is the direction of the normal force on you from the seat when you are at the top of the wheel? i. upward, ii. downward, iii. impossible to determine
The direction of the normal force from the seat when atop the wheel would be downward. Option II.
Direction of the normal forceThe direction of the normal force on you from the seat when you are at the top of the wheel is downward.
This is because the normal force is always perpendicular to the surface of the seat, and at the top of the Ferris wheel, the surface of the seat is pointing downward.
The normal force is what keeps you from falling through the seat, and it must always be directed perpendicular to the seat's surface to provide the necessary support.
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When a car goes around a curve of smaller and smaller radius, the centripetal force on it decreases. True or False?
The given statement, "When a car goes around a curve of smaller and smaller radius, the centripetal force on it decreases." is false.
The centripetal force required to keep a car moving in a curved path at a constant speed is directly proportional to the square of its velocity and inversely proportional to the radius of the curve.
As the radius of the curve decreases, the required centripetal force increases, not decreases. If the centripetal force on the car decreases, it would move out of its circular path, implying a decrease in velocity or radius of curvature.
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how to convert 52 f to c?
52F is equal to 11.11°C. The calculation to convert from Fahrenheit to celsius takes the Fahrenheit temperature, subtracts 32 from it, and then multiplies the result by 5/9.
In order to convert from Fahrenheit (F) to Celsius (°C), you will need to use the following equation:
[tex]C = (F - 32) * (5/9)[/tex]
In this case, to convert 52F to °C, we use the equation:
[tex]C = (52 - 32) * (5/9)[/tex]
Substituting the values, we get:
[tex]C = 20 * (5/9)[/tex]
Simplifying this equation, we get:
°C = 11.11
Therefore, 52F is equal to 11.11°C.
This conversion formula takes into account the difference between the two temperature scales, with farenheit being the higher temperature scale and celcius being the lower temperature scale.
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how does the length of the cord/strings affect the descent of the parachute?
The hang time of the parachute increased with string length, increasing air resistance. Even while gravity was always pushing on the object, the shorter strings increased the force it was exerting.
Gravity and drag are the main forces affecting a parachute. When you initially open the parachute, gravity pulls it downward and causes it to fall quickly to the ground. Yet, the amount of drag increases with falling speed.
The more air that needs to be forced out of the way by a parachute's bigger surface area, the slower it descends.
Air resistance rises with string length, prolonging the hang time and affecting the descent of the parachute. The shorter ropes increased the force that gravity was imposing on the object even though gravity was always pulling on it.
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why do hurricanes spin as they are moving
Hurricanes spin as they move due to a phenomenon known as the Coriolis effect, which is caused by the Earth's rotation. The Coriolis effect is a result of the fact that different parts of the Earth rotate at different speeds.
Specifically, the Earth rotates more rapidly at the equator than at the poles.
As air moves from high-pressure areas to low-pressure areas, it is deflected by the Coriolis effect. In the case of a hurricane, the low-pressure area at the center of the storm causes air to flow inward from all directions. As the air moves toward the center of the storm, it is deflected to the right (in the Northern Hemisphere) due to the Coriolis effect. This deflection causes the air to start rotating counterclockwise around the center of the storm.
The rotation of the hurricane becomes more pronounced as the storm gains strength and size, with the wind speed increasing as the storm's pressure drops. The direction of rotation is determined by the hemisphere the storm is in, with hurricanes in the Northern Hemisphere rotating counterclockwise and hurricanes in the Southern Hemisphere rotating clockwise. The rotation of a hurricane is also affected by other factors such as the shape of the coastline and the temperature of the water, but the Coriolis effect is the main cause of the storm's rotation.
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A car of mass 900 kg is driving along a horizontal road at 15 m/s when the brakes are applied and the wheels lock. The car glides on a thin 0. 003 mm layer of water with a contact area of 0. 4 m2. Calculate
A) The frictional force can be calculated as: 177.18 N.
B) The acceleration of the car is 0.197 m/s^2.
C) It takes approximately 15.23 seconds for the car to come to a complete stop.
Assuming that the coefficient of friction between the tires and the water is approximately 0.02, the frictional force between the tires and the water can be calculated as follows:
Frictional force = coefficient of friction * contact area * pressure
The pressure can be calculated as the weight of the car divided by the contact area:
Pressure = weight / contact area = (900 kg * 9.81 m/s^2) / 0.4 m^2 = 22,147.5 Pa
Therefore, the frictional force can be calculated as:
Frictional force = 0.02 * 0.4 m^2 * 22,147.5 Pa = 177.18 N
The acceleration of the car can be calculated using Newton's second law:
Net force = mass * acceleration
The net force acting on the car is the frictional force, since the wheels are locked and there is no other external force acting on the car. Therefore:
Frictional force = mass * acceleration
Acceleration = Frictional force / mass = 177.18 N / 900 kg = 0.197 m/s^2
The time it takes for the car to come to a complete stop can be calculated using the kinematic equation:
Vf^2 = Vi^2 + 2 * acceleration * distance
where Vf is the final velocity (0 m/s), Vi is the initial velocity (15 m/s), and distance is the distance the car travels before coming to a stop. Solving for distance:
distance = (Vf^2 - Vi^2) / (2 * acceleration) = (0 m/s - (15 m/s))^2 / (2 * 0.197 m/s^2) = 114.22 m
The time it takes for the car to travel this distance can be calculated using the kinematic equation:
distance = (Vi + Vf) / 2 * time
Solving for time:
time = 2 * distance / (Vi + Vf) = 2 * 114.22 m / (15 m/s + 0 m/s) = 15.23 s
Therefore, it takes approximately 15.23 seconds for the car to come to a complete stop.
The given question is incomplete, the complete question is
A car of mass 900 kg is driving along a horizontal road at 15 m/s when the brakes are applied and the wheels lock. The car glides on a thin 0. 003 mm layer of water with a contact area of 0. 4 m2. Calculate
the following:
A) The frictional force between the tires and the water.
B) The acceleration of the car.
C) The time it takes for the car to come to a complete stop.
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The figure below shows electrons moving along an electric current towards and away from the light bulb. Electrons traveling along an electric current. Arrow under electrons points right and left both towards and away from the light bulb. Does this figure show a direct or alternating current?
The figure below showing electrons moving along an electric current towards and away from the light bulb with arrows pointing right and left in both directions, indicates that the current is alternating.
What is Electric Current?
It is the rate at which electric charges move through a circuit, measured in amperes (A). Electric current is caused by the movement of electrons, which carry a negative charge, and it flows from a region of higher electric potential to a region of lower electric potential.
Electric current can be produced by a variety of sources, including batteries, generators, and power plants. The amount of current that flows through a circuit depends on the voltage, or electric potential difference, and the resistance of the circuit. Ohm's law describes the relationship between these variables: current is equal to voltage divided by resistance (I = V/R).
In an alternating current (AC), the flow of electric charge changes direction periodically, typically 50 or 60 times per second (50 or 60 Hertz). The direction of the current reverses periodically, causing the electrons to move back and forth, as shown in the figure. In a direct current (DC), the flow of electric charge is always in one direction, and the electrons move in one direction only.
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Kayla is going on a trip. The mass of
everything she is packing is 9.8 kg.
She packs everything into a bag that has a
mass when empty of 620 g.
What is the total mass of the bag and its
contents?
Give your answer in kg
Answer:
the total mass of the bag and its contents is 10.42 kg.
Explanation:
First, we need to convert the mass of the bag when empty from grams to kilograms:
620 g = 0.62 kg
Next, we can add the mass of the bag when empty to the mass of everything Kayla is packing:
total mass = 9.8 kg + 0.62 kg = 10.42 kg
Therefore, the total mass of the bag and its contents is 10.42 kg.
QuestionCompared to the star it evolved from, a red giant is Ahotter and brighter.Bhotter and dimmer.Ccooler and brighter.Dcooler and dimmer.Easy
Compared to the star it evolved from, a red giant is Hotter and dimmer. A red giant is an evolved, large, luminous star that has exhausted the hydrogen fuel in its core.
It is formed when a star's core contracts and heats up, causing it to expand significantly. This increases its luminosity, but since it is no longer producing energy from nuclear fusion, it is cooler and dimmer than the star that it evolved from. A red giant is a large and bright star that is in the later stages of its life cycle. It is much larger and brighter than the star it evolved from, but at the same time it is much cooler and dimmer. This is because, as the star ages, it expands and its luminosity decreases, making it cooler and dimmer. Red giants are also much larger than their original star, reaching up to 100 times the diameter of our sun.
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A bird is flying due east. Its distance from a tall building is given by x(t) = 25. 0m + (11. 7m/s)t - (0. 400m/s^3)t^3
A bird is flying due east. Its distance from a tall building is 33.5 meters away, at the instance of a time of 5 seconds.
To solve this problem, we need to find the position of the bird at a given time t.
The equation for the position of the bird as a function of time is:
[tex]x(t) = 25.0m + (11.7m/s)t - (0.400m/s^3)t^3[/tex]
To find the distance and position of the bird at a specific time, we can substitute that time into the equation and solve for x. Let's say we want to find the position of the bird at t = 5 seconds.
[tex]x(5) = 25.0m + (11.7m/s)(5s) - (0.400m/s^3)(5s)^3[/tex]
[tex]x(5) = 25.0m + 58.5m - 50.0m[/tex]
[tex]x(5) = 33.5m[/tex]
Therefore, at t = 5 seconds, the bird is 33.5 meters away from the tall building.
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what is newtons to kg?
Answer:
Below
Explanation:
They are not equivalent. but to find out the mass which weighs Newtons
divide Newtons by 'g ' Newtons/ (9.81 m/s^2) = KG (on earth)
Shows 100ml of water being poured through a soil sample. After the water has passed through the soil, 98ml of water is measured in the collection tray below the sample. Of the following, which is the most likely composition of the soil sample?
a. Clay - 80%; Silt - 10%; Sand - 10%
b. Clay - 50%; Silt - 40%; Sand - 10%
c. Clay - 40%; Silt - 50%; Sand - 10%
d. Clay - 10%; Silt - 10%; Sand - 80%
The most likely composition of the soil sample is, Clay 80%, Silt 10%, Sand 10%. Correct answer is option (a).
The volume of water that did not pass through the soil is assumed to be absorbed by the soil or evaporated. In this case, 2 ml of water were not collected, so the soil must have absorbed or evaporated this amount.
We can calculate the percent of water that passed through the soil by dividing the amount collected by the amount poured into the soil sample, then multiplying by 100. In this case, (98 ml / 100 ml) x 100 = 98%.
Based on this result, we can make an educated guess about the soil's texture. Soil with a high percentage of clay particles tends to have low permeability, which means it absorbs less water and more water passes through. The texture option that best matches this scenario is option (a) - Clay 80%, Silt 10%, Sand 10%.
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Determine the total charge transferred over the time interval of 0 ≤ t ≤ 10 s when i(t) = ½t A.
The total charge transferred over the time interval of 0 ≤ t ≤ 10 s is 25 Coulombs.
To determine the total charge transferred over the time interval of 0 ≤ t ≤ 10 s when i(t) = ½t A, we need to integrate the current with respect to time over the given time interval:
Q = ∫i(t) dt from t = 0 to t = 10
Q = ∫(½t) dt from t = 0 to t = 10
Q = ¼[t^2] from t = 0 to t = 10
Solving further,
Q = ¼[(10)^2 - (0)^2]
Q = 25 C
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which of the following are characteristics of slab pull? multiple select question. gravity is a major force in slab pull. the heat of the asthenosphere pulls against the lithospheric slab. subducting plates move faster than nonsubducting plates. subducting oceanic lithosphere is denser than asthenosphere.
Gravity is a major force in slab pull Sub-ducting plates move faster than non-sub-ducting plates. Sub-ducting oceanic lithosphere is denser than asthenosphere are the characteristics of slab pull.
What is slab pull?Slab pull is a process causing the subduction of oceanic lithosphere. It is the dominant mechanism of plate tectonic motion in which an area of the Earth's oceanic lithosphere moves under an overriding plate, which causes it to sink into the Earth's mantle. It occurs when the gravity of the sub-ducting slab of lithosphere, which is denser than the material around it, causes the slab to move slowly and steadily into the Earth's interior. The slab pull force is the major contributor to plate motion and is the result of the sinking of cold, dense lithosphere into the mantle.
The characteristics of slab pull are:
1. Subduction: Slab pull is caused by subduction, where one tectonic plate slides beneath another and is forced down into the mantle. Subduction occurs at convergent plate boundaries, such as subduction zones.
2. Negative Buoyancy: Sub-ducting lithosphere has a negative buoyancy, meaning it is denser than the surrounding asthenosphere and is therefore pulled down. This induces a down-force on the overriding lithosphere, which is known as slab pull.
3. Moving Plates: Slab pull is responsible for the movement of oceanic lithosphere, which is constantly being recycled. As oceanic lithosphere is sub-ducted, new lithosphere is formed at divergent plate boundaries and is then pushed away from the ridge.
4. Stress: Slab pull also plays a role in creating stress in the lithosphere. As plates move away from the ridge, they create tension in the lithosphere. This tension is released when the plates meet a subduction zone, resulting in an earthquake.
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what temperature change will 100 ml of water undergo when it absorbs 325 joules of heat
The temperature change we will notice when 100 ml of water undergoes when it absorbs 325 joules of heat is 0.7647 °C.
The mass of water would be the density of water times the volume of the water and
the density of water is 1g/ml,
therefore the mass of water would be
= (100 ml)(1 g/ml)
= 100 g
And we know that,
Q = m.c.ΔT
where,
Q is the energy supplied to the water
m is the mass of water
c is the specific heat constant
and ΔT is the change in temperature
So, after plugging the given values of the question in the equation we get,
325 J=(100 g)×(4.2 J/gC)×ΔT
ΔT = 0.7647 °C
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Two airplanes are flying above San Antonio, plane 1 is traveling 250 km/hr at a height of 2,000 m above the city. Plane 2 is traveling 150 km/hr at a height of 3,000 m above the city. Which of the statements below best describes the energy of each plane?
A Plane 1 and plane 2 have the same kinetic and potential energy
B Plane 1 has more kinetic energy than plane 2 but they have the same potential energy
C Plane 1 has more kinetic energy and plane 2 has more potential energy
D Plane 1 has more potential energy and plane 2 has more kinetic energy.
Answer:
C) Plane 1 has more kinetic energy and plane 2 has more potential energy.
Explanation:
he potential energy of an object is determined by its height above a reference level and its mass, while the kinetic energy of an object is determined by its mass and speed.
In this scenario, plane 1 has a higher speed than plane 2, but it is flying at a lower height. On the other hand, plane 2 is flying at a higher height, but it has a lower speed. Since the planes have different heights, they have different potential energies.
Therefore, the correct statement is: C) Plane 1 has more kinetic energy and plane 2 has more potential energy.
Answer:
C) Plane 1 has more kinetic energy and plane 2 has more potential energy.
Explanation:
he potential energy of an object is determined by its height above a reference level and its mass, while the kinetic energy of an object is determined by its mass and speed.
In this scenario, plane 1 has a higher speed than plane 2, but it is flying at a lower height. On the other hand, plane 2 is flying at a higher height, but it has a lower speed. Since the planes have different heights, they have different potential energies.
Therefore, the correct statement is: C) Plane 1 has more kinetic energy and plane 2 has more potential energy
A sensor uses 2.0 x 10-4 A of current when it is operated by a 3.0-V battery. What is the resistance of the sensor circuit?
Knowing the voltage and current of a sensor, we have that the resistance of the sensor is worth 15,000 Ω.
The resistance of the sensor circuit can be calculated using Ohm's Law, which states that the resistance (R) is equal to the voltage (V) divided by the current (I). In this case, the voltage is 3.0 V and the current is 2.0 x 10⁻⁴ A. Therefore, the resistance can be calculated as follows:
R = V / I
R = 3.0 V / (2.0 x 10⁻⁴ A)
R = 15,000 Ω
Therefore, the resistance of the sensor circuit is 15,000 Ω.
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how to convert 175c to f?
175 °C is equivalent to 347 °F. To convert a temperature from Celsius to Fahrenheit, you multiply the Celsius temperature by 9/5 and add 32.
To convert 175 degrees Celsius (°C) to Fahrenheit (°F), you can use the following formula:
°F = (°C x 9/5) + 32
Plugging in the given value of 175 °C, we get:
°F = (175 x 9/5) + 32 = 315 + 32 = 347 °F (rounded to two decimal places)
Therefore, 175 °C is equivalent to 347 °F.
The Celsius and Fahrenheit scales are two common temperature scales used in different parts of the world. Celsius (°C) is a metric temperature scale used in most countries around the world, while Fahrenheit (°F) is a temperature scale used primarily in the United States and a few other countries.
The conversion formula between Celsius and Fahrenheit is:
°F = (°C x 9/5) + 32 °C = (°F - 32) x 5/9
To convert a temperature from Celsius to Fahrenheit, you multiply the Celsius temperature by 9/5 and add 32. To convert a temperature from Fahrenheit to Celsius, you subtract 32 from the Fahrenheit temperature and then multiply the result by 5/9.
It's important to note that Celsius and Fahrenheit have different freezing and boiling points. In Celsius, water freezes at 0°C and boils at 100°C, while in Fahrenheit, water freezes at 32°F and boils at 212°F. This means that the same temperature can have different meanings depending on the scale used.
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What does the presence of molecular bands in the spectrum of a star indicate?
how does the material type affect the descent of the parachute?
The type of material has two effects on the parachute. The lighter the parachute, the slower it will descend. The heavier the parachute, the faster it will fall.
The parachute is slowed down by air resistance due to the material's big surface area. More air resistance and a slower parachute descent result from a larger surface area.
Since, the material affects how the parachute descended, it is essential that it be windproof, flexible, and light-weight. It must be able to resist environmental factors like high-altitude winds. While it takes longer to descend with lighter materials, it takes less time to descent with heavier ones. The material is basically chosen to be lighter or less heavy for this purpose.
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the atomic number of iron is 26, which means it has 26 protons. how many electrons would it have?
Answer: 26 electrons
Explanation:
The number of electrons and protons will always be the same number unless you are looking at an isotope.
So for iron, for example, there will be 26 protons, 26 electrons, and 30 neutrons.
How to convert 98.5 f to c
98.5°F can be converted into °C by subtracting 30 from this number and then dividing the result by 2, so that 98.5°F equals 34.25°C.
Celsius and Fahrenheit are the units used to measure temperature ranges. Celsius scale is globally accepted while Fahrenheit scales is only used in five countries. Celsius is also called centigrade and is symbolized by C while Fahrenheit is symbolized as F. To convert F into C we can first subtract 30 from the given temperature in F, and then divide the whole by 2. Therefore, 98.5°F is equivalent to 34.25°C.
On the other hand, of you want to convert C into F, then first multiply the temperature given in Fahrenheit by 2, and then add 30 to get the result in °C. According to the Celsius scale, the normal body temperature of a human is 37°C, while in Fahrenheit it is 98.6°. Moreover, water freezes at 0°C and boils at 100°C.
Celsius scale is a part of metric system or commonly known as standard unit (SI) system.
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Wind, water, and gravity, temperature changes, and pressure changes are all a cause of what process?
a chemical weathering
b physical weathering
c biological weathering
d acid weathering
Wind, water, and gravity, temperature changes, and pressure changes are all causes of physical weathering.
What is pressure?Pressure is a measure of the force exerted per unit area. It is a physical quantity that is used to describe the intensity of a force distributed over a surface. In other words, it refers to the amount of force applied to an object or substance divided by the area over which the force is applied. Pressure can be measured in a variety of units, such as pascals (Pa), pounds per square inch (psi), atmospheres (atm), and torr. The most common unit of pressure in everyday life is probably psi or atm, while in scientific contexts, the SI unit pascal is often used. Pressure is an important concept in many fields of science and engineering. It plays a critical role in fluid dynamics, thermodynamics, and mechanics, among others. Understanding how pressure works is important in a variety of applications, such as designing hydraulic systems, measuring blood pressure, predicting weather patterns, and analyzing the behavior of gases.
Here,
Physical weathering, also known as mechanical weathering, is the breakdown of rocks into smaller pieces without any change in their chemical composition. Wind, water, and gravity can all cause physical weathering by physically breaking rocks into smaller pieces. Temperature changes and pressure changes can also cause physical weathering by causing rocks to expand and contract, which can lead to cracks and fissures.
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YEA
A tether ball on a 2 meter line is 1 kg.
It is traveling at 10 m/s. What force is on
00S s il elm 21 is alevst
the line?
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The force on the tetherball is 50 Newtons.
What force is on the tether ball?
To calculate the force on the tetherball, we need to use Newton's second law, which states that the force (F) acting on an object is equal to the mass (m) of the object times its acceleration (a).
F = ma.
In this case, we know the mass of the ball (m = 1 kg) and its speed (v = 10 m/s), but we need to calculate its acceleration.
The acceleration of an object moving in a circle is given by the formula a a = v^2/r
where;
r is the radius of the circle.In this case, the circle is formed by the tetherball swinging around the pole, and the radius is the length of the tether, which is 2 meters. So, the acceleration of the ball is:
a = v^2/r = (10 m/s)^2 / 2 m = 50 m/s^2
Now, we can use Newton's second law to find the force:
F = ma
F = 1 kg * 50 m/s^2
F = 50 N
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(5 points) a map of equipotential curves has places in which the curves are much closer together than in other regions. is the field strong or weak where the curves are close together? explain why.
Answer: It is stronger
Explanation: The electric field=ΔV/Δl where l is the distance between the equipotential lines. Electric field strength is inversely proportional to the change in distance between the lines, so as the distance between the lines shrinks( become closer together) the electric field strength increases given that ΔV remains constant.
←
2006
Currently, you are watching this man pull a semi-truck behind him by a rope at a constant
velocity of 0.5 m/s. The truck has a mass of 6,820 kg while the man doing the pulling has a
mass of 114 kg. The coefficient of kinetic friction between the tire and the concrete is 0.35
giving the truck a frictional force of 23,392.6 N. The challenge is to pull the truck a distance of at
least 25 meters.
Considering this information, how much tension force is there in the rope while the man is
pulling on the semi-truck?
A. 391.0 N
B. 50.0 N
C. 23,392.6 N
D. 17,3350 N
The tension force there in the rope while the man is pulling on the semi-truck will be 23,392.6 N. The correct option is C.
What is a tension force?The tension force is the two opposite forces acting on the body and trying to pull the body outwards.
To pull the semi-truck at a constant velocity of 0.5 m/s, the man must apply a force equal in magnitude to the frictional force acting on the truck. This force is given by:
F = μ x N
Where μ is the coefficient of kinetic friction, and N is the normal force exerted by the ground on the truck. The normal force is equal in magnitude to the weight of the truck, which is given by:
N = m x g
Where m is the mass of the truck and g is the acceleration due to gravity (9.81 m/s²).
Substituting the given values, we get:
N = 6,820 x 9.81 = 66,887.2 N
F = 0.35 x 66,887.2 = 23,392.6 N
Since the man is pulling the truck at a constant velocity, the tension force in the rope must also be equal in magnitude to the frictional force acting on the truck, which is 23,392.6 N.
Therefore, the answer is C. 23,392.6 N.
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A water pipe in a building delivers 1000 liters (with mass 1000 kg) of water per second. The water is moving through the pipe at 1.4 m/s. The pipe has a 90° bend, and the pipe will require a supporting structure, called a thrust block, at the bend, as in the figure. We can use the ideas of momentum and impulse to understand why. Each second, 1000 kg of water moving at vx=1.4 m/s changes direction to move at vy=1.4 m/s. a. What is the momentum (magnitude and direction) of water before the bend? b. What is the momentum (magnitude and direction) of water after the bend? c. What are the magnitude and direction of the change in momentum of the 1000 kg of water? (Hint: subtracting a vector is same as adding that vector in negative direction) d. What are the magnitude and direction of the necessary impulse? e. This impulse takes place over 1.0 s. What is the necessary force?
a. Momentum is before band, 1400 kg m/s. b. Momentum after the band is, -1400 kg m/s. c. Change in momentum is, -2800 kg m/s. d. Necessary impulse is, -2800 kg m/s. e. Necessary force is, -2800 N.
a. The momentum of water before the bend is given by the product of its mass and velocity,
p1 = mv = (1000 kg)(1.4 m/s) = 1400 kg m/s in the direction of x-axis.
b. The momentum of water after the bend is also given by the product of its mass and velocity,
p2 = mv = (1000 kg)(-1.4 m/s) = -1400 kg m/s in the direction of y-axis.
c. The change in momentum of the 1000 kg of water is given by the vector subtraction,
Δp = p2 - p1 = (-1400 kg m/s) - (1400 kg m/s) = -2800 kg m/s in the direction of y-axis.
d. The necessary impulse is equal to the change in momentum,
J = Δp = -2800 kg m/s in the direction of y-axis.
e. The necessary force is given by the impulse divided by the time interval over which it acts:
F = J/Δt = (-2800 kg m/s) / (1.0 s) = -2800 N in the direction of y-axis.
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what is ionospheric reflection maximum angle of incidence ?
The ionospheric reflection maximum angle of incidence (MOF) is the highest angle of incidence at which a radio wave can be reflected by the ionosphere back towards the Earth's surface.
This maximum angle of incidence varies with the frequency of the radio wave and the height of the ionosphere.The ionosphere is a layer of ionized gases in the upper atmosphere that can reflect certain frequencies of radio waves back towards the Earth's surface.
The maximum angle of incidence is the steepest angle at which the radio wave can penetrate the ionosphere and still be reflected back to Earth.For example, for a radio wave with a frequency of 10 MHz, the MOF may be around 10 degrees, while for a radio wave with a frequency of 30 MHz, the MOF may be around 30 degrees.
The MOF also varies with the height of the ionosphere, which changes depending on factors such as time of day, season, and solar activity. Understanding the MOF is important in radio communication, particularly for long-distance communication, as it can affect the range and reliability of radio signals.
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Water comes of a tap of cross-sectional area 1.5 cm². After falling a vertical distance of 6.0 cm, the cros sectional area of the water column was found to have reduced to 0.45 cm². Calculate the speed of the water as it exited the tap.
The speed of the water as it exits the tap is approximately 1.89 m/s.
What is the speed of the water as it exited the tap?We can use the principle of conservation of mass and energy to solve this problem. Assuming that the water is incompressible and the flow is steady, the mass flow rate of water at the tap is constant. Therefore, the mass flow rate at the tap is equal to the mass flow rate at the exit:
ρ1A1v1 = ρ2A2v2
where:
ρ1 is the density of water at the tapA1 is the cross-sectional area of the tapv1 is the speed of water at the tapρ2 is the density of water at the exit (we assume it to be the same as ρ1)A2 is the cross-sectional area of the water column at the exitv2 is the speed of water at the exit (what we need to calculate)We can rearrange this equation to solve for v2:
v2 = (ρ1A1v1) / (ρ2A2)
We know that A1 = 1.5 cm², A2 = 0.45 cm², and the vertical distance fallen is 6.0 cm. We can find the speed of water at the tap using the equation for the potential energy:
mgh = (1/2)mv1²
where m is the mass of the water, g is the acceleration due to gravity, h is the vertical distance fallen, and v1 is the speed of water at the tap.
We can rearrange this equation to solve for v1:
v1 = √(2gh)
where;
h = 6.0 cm and g = 9.81 m/s².We also know that the density of water at room temperature is approximately 1000 kg/m³, which is equivalent to 0.001 g/cm³.
Putting all these values into the equation for v2, we get:
v2 = (0.001 g/cm³ x 1.5 cm² x sqrt(2 x 9.81 m/s² x 6.0 cm)) / (0.001 g/cm³ x 0.45 cm²)
Simplifying this expression, we get:
v2 = 1.89 m/s
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Which voice can produce a pitch that has a speed of 343 m/s and a wavelength of 0. 68 m? Check all that apply.
bass
baritone
tenor
contralto
sopran
A tone having a velocity of 343 m/s and a wavelength of 0.68 m can generate the following voices: baritone and tenor.
The speed of sound is constant at 343 m/s in dry air at room temperature, so the speed is not a determining factor for the pitch of a voice. The wavelength, however, is related to the pitch. The shorter the wavelength, the higher the pitch.
Based on the given wavelength of 0.68 m, we can determine the frequency of the sound using the formula:
frequency = speed / wavelength = 343 m/s / 0.68 m = 504.4 Hz
This frequency falls within the range of a baritone voice (196 Hz to 524 Hz) and a tenor voice (262 Hz to 698 Hz). Therefore, the correct answers are baritone and tenor.
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