The question is asking for the work done on the athlete by the pushing force of the pole. The pushing force that the pole exerts back on the athlete is given as an external force. The work done by an external force is calculated using the formula W = Fd, where W is work, F is force, and d is the distance over which the force acts. In this case, the pushing force of the pole is given as an external force of unknown magnitude, but we are given the distance over which it acts, which is 0.20 meters. Therefore, we can use this distance along with the formula W = Fd to calculate the work done on the athlete:
W = Fd
We don't know the value of F, so we cannot solve for W directly. However, we do know that the pushing force of the pole is equal and opposite to the force exerted by the athlete on the pole. This is because of Newton's third law of motion, which states that for every action, there is an equal and opposite reaction. So, we can assume that the force exerted by the athlete on the pole is also equal in magnitude to the pushing force of the pole, but in the opposite direction. Therefore, we can rewrite the formula for work as:
W = -Fd
where the negative sign indicates that the work done is in the opposite direction to the force.
Now, we can substitute the given values into the formula to find the work done on the athlete:
W = -(F)(0.20)
We don't know the value of F, but we can assume that it is a positive value since the pole is pushing back on the athlete. Therefore, the negative sign in the formula will make the work done negative, indicating that it is in the opposite direction to the pushing force of the pole. Without knowing the value of F, we cannot calculate the exact amount of work done on the athlete. However, we can say that the work done will be negative and proportional to the magnitude of the pushing force of the pole, multiplied by the distance over which it acts.
To know more about athlete visit:-
https://brainly.com/question/17404705
#SPJ11
many terms from physics are badly misused in everyday language. in both cases, explain the errors involved. (a) a strong person is called powerful. what is wrong with this use of power? (b) when a worker carries a bag of concrete along a level construction site, people say he did a lot of work. did he?
(a) The term "powerful" is often misused in everyday language to describe a person who is physically strong.
However, in physics, power is defined as the rate at which work is done, or the amount of energy transferred per unit time. Therefore, a person's physical strength does not necessarily correlate with their power. The correct use of power would refer to the rate at which a person can perform work or transfer energy.
(b) When people say that a worker carrying a bag of concrete did a lot of work, they are using the term "work" incorrectly. In physics, work is defined as the product of the force applied to an object and the displacement of the object in the direction of the force.
In this case, if the worker is carrying the bag of concrete along a level surface without any vertical displacement, then no work is actually being done. Instead, the worker is simply expending energy to move the weight of the bag from one location to another.
Therefore, the correct use of the term would be to say that the worker exerted a lot of effort or energy, but not necessarily that they did a lot of work.
To learn more about work is done click here
brainly.com/question/31428590
#SPJ11
2. The moon was not a graceful orb but a misshapen circle. No stars were visible. It spooked
Heidi that the moon was so clear and the stars so missing. Even as she looked out, the sky
around the moon darkened threateningly. It did not seem cold enough for snow. They would
have one of those grim, depressing, icy rains.
The sky was _____
A) mysterious
B) sparkling
C) smoky
D) peaceful
Answer:
a c
Explanation:
The magnetic field at the center of a circular coil of wire with N0 turns and radius R0 and carrying current I0 can be doubled by:
The magnetic field at the center of a circular coil can be doubled by either doubling the number of turns (No) to 2No or doubling the current ([tex]I_{0}[/tex]) to 2[tex]I_{0}[/tex].
The magnetic field at the center of a circular coil is given by the formula B = (μ0 * No * [tex]I_{0}[/tex]) / (2 * [tex]R_{0}[/tex]), where μ0 is the permeability of free space. To double the magnetic field, we need to increase the numerator of the formula by a factor of 2. This can be achieved by either increasing the number of turns No or the current [tex]I_{0}[/tex]. Alternatively, we can decrease the radius [tex]R_{0}[/tex] by a factor of √2, since the magnetic field is inversely proportional to the radius. Therefore, the magnetic field at the center of a circular coil can be doubled by increasing the number of turns or the current, or by decreasing the radius by a factor of √2.
Learn more about permeability here: https://brainly.com/question/1023696
#SPJ11
List three uses of the rare earth metal neodymium.
Neodymium is a key component of the powerful magnets used in many everyday products. Neodymium oxide can be used as a glass colorant to create a range of hues. Neodymium compounds are used as catalysts in a variety of industrial processes
Neodymium is a versatile rare earth metal with various applications. Three uses of neodymium are:
1. Magnets: Neodymium is used to create strong permanent magnets, known as neodymium-iron-boron (NdFeB) magnets. These magnets are commonly found in electric motors, generators, headphones, and hard disk drives.
2. Glass: Neodymium is used as a colorant in glass to produce specific shades, particularly in sunglasses and camera lenses. It also helps reduce glare and enhance contrast in optical devices.
3. Catalysts: Neodymium acts as a catalyst in certain chemical reactions, particularly in the petroleum industry for refining crude oil and producing synthetic fuels.
Learn more about Neodymium here:
https://brainly.com/question/29314097
#SPJ11
During a clear, relatively calm day, the relative humidity will tend to ________ from sunrise to early afternoon.
During a clear, relatively calm day, the relative humidity will tend to decrease from sunrise to early afternoon.
During a clear, relatively calm day, several factors can contribute to a decrease in relative humidity from sunrise to early afternoon:
Increase in temperature: As the day progresses from sunrise to early afternoon, the temperature usually rises due to the sun's heat. Warmer air can hold more moisture, so as the temperature increases, the air has a higher capacity to hold water vapor, resulting in a decrease in relative humidity.Evaporation: During the day, the warmth from the sun can cause surface moisture, such as dew or water on leaves or the ground, to evaporate. As the moisture evaporates into the air, it increases the water vapor content in the air, which can lead to a decrease in relative humidity.Mixing of air: During the early hours of the day, the air near the ground is usually cooler and has higher relative humidity due to factors such as dew formation or overnight moisture. However, as the day progresses, the air near the ground and the upper atmosphere tend to mix due to atmospheric processes, leading to a decrease in relative humidity as the moisture gets distributed throughout the atmosphere.These factors combined can lead to a decrease in relative humidity from sunrise to early afternoon during clear, relatively calm days. However, it's important to note that local weather patterns, geography, and other factors can affect relative humidity, and it may not always follow this general trend.
To know more about moisture,
https://brainly.com/question/13768807
#SPJ11
A 1000 kg truck going 8 m/s west strikes a 900 kg car
going 6 m/s East. The truck continues west at 1.4 m/s.
What is the final velocity of the car?
The final velocity of the car is 1.33 m/s to the west.
What is the final velocity of the car?The final velocity of the car is calculated by applying the principle of conservation of linear momentum.
m1v1 + m2v2 = m1v1' + m2v2'
where;
m1 and m2 are the masses of the truck and the car, respectivelyv1 and v2 are their initial velocities, and v1' and v2' are their final velocities.The final velocity of the car is calculated as
(1000 kg)(-8 m/s) + (900 kg)(6 m/s) = (1000 kg)(-1.4 m/s) + (900 kg)(v2')
-2,600 = -1400 + 900v2'
v2' = -1200/900
v2' = -1.33 m/s
Learn more about linear momentum here: https://brainly.com/question/7538238
#SPJ1
What is the recommended initial therapy for a patient with stable narrow-complex tachycardia, after establishing an IV and acquiring a 12-lead ecg?
a. Adenosine b. B-blockers
c. Cardioversion
d. Vagal maneuvers
The recommended initial therapy for a patient with stable narrow-complex tachycardia, after establishing an IV and acquiring a 12-lead ecg, is usually vagal maneuvers.
These can include techniques such as bearing down or using the Valsalva maneuver. If vagal maneuvers are unsuccessful, adenosine or B-blockers may be considered. Cardioversion is typically reserved for unstable tachycardia. This should be attempted first as it is the least invasive approach and has the lowest risk of complications. If vagal maneuvers are not successful, then other treatments such as B-blockers or adenosine may be attempted. If these treatments are unsuccessful, then cardioversion may be necessary.
To learn more about vagal maneuvers click here https://brainly.com/question/30113352
#SPJ11
The initial therapy for a patient with stable narrow-complex tachycardia is vagal maneuvers. These can slow the heart rate. If unsuccessful, then medications or more invasive strategies may be considered.
Explanation:The recommended initial therapy for a patient with stable narrow-complex tachycardia, after establishing an IV and acquiring a 12-lead ECG, is vagal maneuvers (option d). Vagal maneuvers influence the autonomic nervous system and can be employed to slow down the heart rate. Vagal maneuvers used include the Valsalva maneuver or carotid sinus massage. If these maneuvers are unsuccessful, then medications like adenosine or B-blockers may be used or in some severe cases, methods such as cardioversion may be applied. However, these are not initial therapies.
Learn more about Vagal Maneuvers here:https://brainly.com/question/31588972
#SPJ11
An electron moves in a circular trajectory of radius R0 in a uniform magnetic field of strength B0. What is the new trajectory if the field strength is doubled?
If the strength of the magnetic field is doubled, the electron's trajectory will also change.
The new trajectory of the electron will have a smaller radius, since the magnetic force acting on the electron is proportional to the field strength. This means that the electron will curve more tightly and move in a smaller circle with a new radius of [tex]R_{0}[/tex]/2. This is because the magnetic force experienced by the electron is proportional to the cross product of the velocity and magnetic field vectors, which causes the electron to move in a circular path perpendicular to both vectors. Therefore, as the magnetic field strength increases, the electron's trajectory will become more tightly curved.
Learn more about vectors here: https://brainly.com/question/29740341
#SPJ11
(392-18(B)) Each run of cable tray shall be _____ before the installation of cables.
Each run of cable tray shall be inspected before the installation of cables.
Before the installation of cables, each run of cable tray shall be inspected for any signs of damage or wear. It is important to ensure that all supports are secure, that the tray is properly secured to the supports, and that any bends or turns do not exceed the manufacturer's specified radius. It is also important to check that all cable tie-downs are properly installed, as well as to check for any sharp edges or burrs that may damage the cables. In addition, any unused cable trays should be capped or sealed to prevent dust and debris from entering the tray. Finally, the cable tray should be cleared of any debris or obstructions before cables are installed.
To learn more about cables click here https://brainly.com/question/29644544
#SPJ11
A chemical that is frequently applied just prior to filtration is
One example of a chemical that is frequently applied just prior to filtration is a coagulant.
Coagulants or flocculants are chemicals that are commonly used in water and wastewater treatment processes to aid in the removal of suspended particles, colloids, and other impurities from water or wastewater. These chemicals are typically added just prior to the filtration step in the treatment process.
Coagulants are substances that cause destabilization and aggregation of suspended particles and colloids in water, leading to the formation of larger particles called flocs. These flocs can be easily removed by sedimentation or filtration. Common coagulants used in water treatment include aluminum sulfate (alum), ferric chloride, and polyaluminum chloride (PAC).
Flocculants, on the other hand, are substances that promote the aggregation of smaller flocs into larger, settleable flocs. They help to speed up the sedimentation process and improve the efficiency of solid-liquid separation. Flocculants are typically used in conjunction with coagulants to enhance the overall performance of the water treatment process.
To know more about filtration ,
https://brainly.com/question/31504556
#SPJ11
Question 6
Which one of the following sources of noise has been declining slightly in recent years?
a. motorcycle
b. automobile
c. aircraft
d. industrial
the source of noise that has been declining slightly in recent years is the automobile. This is due to the implementation of noise regulations and the development of more efficient and quieter engines.
Answer - 1. Technical evolution of motor vehicles and progress in reducing their noise.
2. Population and urbanisation trends.
3. Economic trends and trends in motor vehicle ownership.
4. Traffic trends, particularly in urban areas.
5. Changes in legislation.
To learn more about the noise pollution -
brainly.com/question/21849543
#SPJ11
#18. What is the period of the voltage source that operates the plasma pencil?
The period of the voltage source that operates the plasma pencil is the time it takes to complete one cycle of oscillation.
The plasma pencil is a device that uses a high-voltage source to generate plasma, which can be used for various applications such as sterilization and surface modification. The period of the voltage source that operates the plasma pencil is the time it takes for the voltage to complete one cycle of oscillation. In general, the period of a voltage source is determined by the frequency of the alternating current (AC) that it generates. The frequency is measured in Hertz (Hz), which represents the number of cycles per second.
The specific period of the voltage source that operates the plasma pencil depends on the design and specifications of the device. Typically, plasma pencils operate at high frequencies ranging from tens of kilohertz to several megahertz. This high frequency allows for efficient plasma generation and control. The period of the voltage source that operates the plasma pencil is determined by the frequency of the AC it generates and can vary depending on the design and specifications of the device.
know more about voltage here:
https://brainly.com/question/27861305
#SPJ11
1. What is the final temperature of two cups of water being mix together? Cup 1 mass is 150
kg and has a temperature of 30 degrees Celsius; Cup 2 mass is 250 kg and has a temperature of
75 degrees Celsius. Specific heat for water (4186)
The final temperature of the two cups of water being mixed together, given that one cup has a temperature of 30 °C and the other has 75 °C, is 58.13 °C
How do i determine the final temperature of the two cups?To obtain the final temperature of the two cups of water, we must obtain the equilibrium temperature of the two cups of water mixture. Details below:
Mass of water in cup 1 (M) = 150 KgTemperature of water in cup 1 (T) = 30 °CMass of water in cup 2 (Mᵥᵥ) = 250 KgTemperature of water in cup 2 (Tᵥᵥ) = 75 °CSpecific heat capacity of the water = 4186 J/KgºC Equilibrium temperature (Tₑ) =?Heat loss by cup 2 = Heat gain by cup 1
MᵥᵥC(Tᵥᵥ - Tₑ) = MC(Tₑ - T)
250 × 4186 (75 - Tₑ) = 150 × 4186(Tₑ - 30)
1046500(75 - Tₑ) = 627900(Tₑ - 30)
Clear bracket
78487500 - 1046500Tₑ = 627900Tₑ - 18837000
Collect like terms
78487500 + 18837000 = 627900Tₑ + 1046500Tₑ
97324500 = 1674400Tₑ
Divide both side by 1674400
Tₑ = 97324500 / 1674400
Tₑ = 58.13 °C
From the above calculation, the equilibrium temperature is 58.13 °C.
Thus, we can conclude that the final temperature of the two cups of water is 58.13 °C
Learn more about temperature:
https://brainly.com/question/14281142
#SPJ1
True or FalseTXVs used in air conditioning units and heat pumps are interchangeable as long as they are the same size and for the same refrigerant.
The True. TXVs used in air conditioning units and heat pumps are interchangeable as long as they are the same size and for the same refrigerant. However, it is recommended to follow the manufacturer's specifications and guidelines to ensure proper operation and efficiency.
True, TXVs Thermostatic Expansion Valves used in air conditioning units and heat pumps are interchangeable as long as they are the same size and for the same refrigerant. Heat pumps and air conditioners have the same set of mechanical components, the same set of the system used for heating purposes can be used for cooling purposes. This is done by the use of a reversible valve in the cycle. flow controllers are designed to adjust the flow of refrigerant into the evaporator so that only vapor leaves the evaporator.
learn more about air here.
https://brainly.com/question/1081420
#SPJ11
Drag the pendulum to an angle (with respect to the vertical) of 90â, and then release it.
With the pendulum swinging back and forth, where is the tension equal to zero?
The tension is zero at the angles+90â andâ90â.
The tension is zero when the angle is +45â and â45â.
The tension is zero when the angle is 0â.
The tension is never zero.
The tension is zero when the pendulum is at its highest point (90 degrees with respect to the vertical) and at its lowest point (also 90 degrees with respect to the vertical).
Therefore, the correct answer is: The tension is zero at the angles +90 degrees and -90 degrees.
The tension is never zero.
When a pendulum is swinging, the tension in the string or rod will always be present as it supports the weight of the pendulum bob and provides the centripetal force required for the swinging motion. The tension will be the least when the pendulum is at its lowest point (angle = 0°), but it will never be equal to zero.
To know more about Pendulum click here .
brainly.com/question/14759840
#SPJ11
A. A coach records the distance a runner
travels during 3 different trials. What is the
runners average speed in kilometers per
minute?
Trial
1
2
W|N
3
Time (min)
.
4
3
6
Distance (km)
0.9
1.1
1.5.
B.
tra
Сс
a
The runners average speed in kilometres per minute is 0.269km/min.
How to calculate average speed?The average speed is the rate of motion or action, specifically the magnitude of the velocity; the rate distance is traversed in a given time.
The average speed of a motion can be calculated by dividing the distance moved by the time taken to complete the distance.
According to this question, a runner runs for a total distance of 3.5km at a total time of 13 mins. The average speed in km/min is
Average speed = 3.5km ÷ 13min = 0.269 km/min
Learn more about average speed at: https://brainly.com/question/12322912
#SPJ1
a rocket with mass 1.2*10^6 has a relativistic kinetic energy of 2.6*10^23 how fast is the rocket moving toppr
The rocket is moving very close to the speed of light, with a velocity of approximately 0.99999999999999999997 times the speed of light.
What is Kinetic Energy?
Kinetic energy is the energy possessed by an object due to its motion. It is defined as the work needed to accelerate a body of a given mass from rest to its current velocity.
We can use the relativistic kinetic energy equation to solve for the velocity of the rocket:
K = (γ - 1)m[tex]c^{2}[/tex]
where K is the relativistic kinetic energy, m is the mass of the rocket, c is the speed of light, and γ is the Lorentz factor, which is given by:
γ = 1 / sqrt(1 - v^2/[tex]c^{2}[/tex])
where v is the velocity of the rocket.
Solving for γ, we get:
γ - 1 = 2.2908*[tex]10^{8}[/tex]
γ = 2.2908*[tex]10^{8}[/tex]+ 1
γ = 2.2908*[tex]10^{8}[/tex]
Substituting γ into the Lorentz factor equation and solving for v, we have:
v = c * sqrt(1 - 1/[tex]γ^{2}[/tex])
v ≈ 0.99999999999999999997c
where c is the speed of light. So the rocket is moving very close to the speed of light, with a velocity of approximately 0.99999999999999999997 times the speed of light.
Learn more about Kinetic Energy
https://brainly.com/question/8101588
#SPJ1
A 4.8-g bullet leaves the muzzle of a rifle with a speed of 328 m/s. What force (assumed constant) is exerted on the bullet while it is traveling down the 0.75-m-long barrel of the rifle
The force exerted on the bullet while it travels down the barrel of the rifle is approximately 6317.3 N.
Using the formula for constant acceleration, the force can be calculated by multiplying the mass of the bullet by its acceleration. Therefore, the force exerted on the bullet is equal to the product of the mass of the bullet and its acceleration. In this case, the mass of the bullet is 4.8 g, or 0.0048 kg, and its acceleration is calculated by dividing the square of the muzzle velocity by twice the length of the barrel. Therefore, the force exerted on the bullet is approximately 6317.3 N.
To learn more about acceleration, click here:
https://brainly.com/question/30660316
#SPJ11
A 600 nm laser illuminates a double-slit apparatus with a slit separation distance of 3.55 μm. The viewing screen is 1.50 meters behind the double slits. What is the distance, in cm, from the central bright fringe to the 3rd dark fringe?
The distance from the central bright fringe to the 3rd dark fringe is approximately 0.48 cm.
Solution
The distance between the central bright fringe and the 3rd dark fringe in a double-slit experiment is given by:
y = (m * λ * L) / d
If y denotes the distance between the edges,
m is the fringe order (an integer value representing the number of bright or dark fringes away from the central fringe),
λ is the wavelength of the light,
L is the length between the two slits.
The distance between the two slits is given by d.
Substituting the given values, we get:
y = (3 * 600 nm * 150 cm) / 3.55 μm
y = 4800 nm
Converting nanometers to centimeters, we get:
y = 4800 nm * (1 cm / 10^7 nm)
y = 0.48 cm
Therefore, the distance from the central bright fringe to the 3rd dark fringe is approximately 0.48 cm.
Learn more about Distance here
brainly.com/question/7243416
Question 21
Sensitivity to radiation is probably highest:
a. Just prior to pregnancy
b. During fetal development
c. During puberty
d. During young adulthood
Sensitivity to radiation is probably highest during fetal development. Option b is correct.
Fetal tissues are rapidly dividing and have a higher metabolic rate compared to adult tissues, making them more vulnerable to the damaging effects of radiation. Exposure to ionizing radiation during fetal development can increase the risk of congenital abnormalities, and even cancer.
In contrast, the risk of radiation-induced cancer tends to increase with age due to accumulated exposure over time. While radiation exposure should be minimized during all stages of life, it is particularly important to take precautions during pregnancy to minimize the risk of harm to the developing fetus. Option b is correct.
To know more about radiation, here
brainly.com/question/13934832
#SPJ4
3. What is the angular speed in rad/s of the second hand of a watch?
A) 1.7 × 10-3 rad/s
B) 0.10 rad/s
C) 0.02 rad/s
D) 6.28 rad/s
E) 60 rad/s
The angular speed of the second hand of a watch is 0.10 rad/s.
To find the angular speed of the second hand of a watch in rad/s, we first need to know the time it takes for the second hand to make a complete revolution (360 degrees) around the watch face. Since there are 60 seconds in a minute, the second-hand makes one full revolution in 60 seconds.
Now, we convert 360 degrees to radians. Recall that 1 radian = 180/π degrees:
360 degrees * (π/180) = 2π radians
Next, we calculate the angular speed (ω) using the formula:
ω = θ/t
where θ is the angle in radians and t is the time in seconds.
ω = (2π radians) / (60 seconds) = π/30 radians/second
Thus, the angular speed of the second hand of a watch is:ω = π/30 ≈ 0.1047 rad/s
This value is closest to option B (0.10 rad/s). So, the correct answer is:
Your answer: B) 0.10 rad/s
To learn more about angular speed, refer:-
https://brainly.com/question/14663644
#SPJ11
17.) The process in which heat flows by the mass movement of molecules from one place to another is known as:
A.) conduction
B.) convection
C.) radiation
The process in which heat flows by the mass movement of molecules from one place to another is known as: B.) convection.
Convection is the transfer of heat through a fluid (gas or liquid) by the movement of the fluid itself. This movement occurs as hotter, less dense portions of the fluid rise and cooler, denser portions sink. This creates a cyclical pattern of rising and sinking motion known as convection currents.
Convection is a natural process that occurs in many systems, including the Earth's atmosphere, oceans, and mantle. It is responsible for many important phenomena, such as the circulation of air and water, weather patterns, and geological activity like volcanic eruptions and plate tectonics.
Convection is also used in many man-made systems, such as air conditioning and heating systems, cooking appliances, and industrial processes. In these systems, fluids are circulated to transfer heat from one location to another, either to cool or to heat a space or to facilitate chemical reactions.
Visit here to learn more about convection brainly.com/question/16635311
#SPJ11
Which of the following scenarios represents thermal energy transfer through radiation?
The scenario that a child sitting in front of a space heater could represent thermal energy transfer through radiation.
What is thermal energy?Thermal energy is described as the energy in an object or system due to the movement of its molecules and atoms.
Radiation occurs when heat moves as energy waves, called infrared waves, directly from its source to something else. The process of radiation is how the heat from the Sun gets to Earth.
On the other hand, electromagnetic radiation is a form of energy that is produced by oscillating electric and magnetic disturbance.
Learn more about radiation at:
https://brainly.com/question/1408043
#SPJ1
complete question:
Which of the following represents thermal energy transfer through radiation
A)a thermometer sitting on top of a heat lamp
B)a person trying to unscrew a hot light bulb
C)a child sitting in front of a space heater
D)swimming in the pool and noticing that the deeper end of the pool is colder than the shallow end
Termination of the defrost cycle occurs when the liquid off the outside coil reaches ___.a. 35°Fb. 45°Fc. 50°Fd. 65°F
Termination of the defrost cycle occurs when the liquid off the outside coil reaches 35°F.
A defrost termination thermostat is mounted onto the coil to detect when the coil is free of ice and will often be set to “terminate” or stop the defrost heat when the coil reaches around 55°F-60°F to ensure that the entire coil is ice-free.If the defrost thermostat warms up to a temperature where it is obvious that there is no more ice on the coil, it breaks the defrost circuit terminating the defrost cycle.
Learn more about thermostat here: https://brainly.com/question/22598217
#SPJ11
10-year-old Sarah stands on a skateboard. Her older brother Jack starts pushing her backward and she starts speeding up. The force of Jack on Sarah isA. greater than the force of Sarah on Jack.B. equal to the force of Sarah on Jack.C. less than the force of Sarah on Jack.
When Jack pushes Sarah on the skateboard, the force he exerts on her is equal and opposite to the force Sarah exerts on Jack. This is known as Newton's Third Law of Motion.
However, the acceleration of Sarah and the skateboard depends on the net force acting on the system. In this case, the net force acting on the system is the force of Jack on Sarah minus the force of friction between the skateboard and the ground. If the force of Jack on Sarah is greater than the force of friction, then the net force is in the backward direction and Sarah speeds up. Therefore, the answer to the question is A. The force of Jack on Sarah is greater than the force of Sarah on Jack, but this does not mean that Jack is stronger than Sarah. It simply means that he is exerting a greater force on her in this particular situation.When Jack pushes Sarah on the skateboard, the force he exerts on her is equal and opposite to the force Sarah exerts on Jack. This is known as Newton's Third Law of Motion.
learn more about equal here
https://brainly.com/question/11400066
#SPJ11
Question 52 Marks: 1 Yeast added to a new septic tank speeds up digestion by a factor of 2.7.Choose one answer. a. True b. False
The statement that adding yeast to a new septic tank speeds up digestion by a factor of 2.7 is not true.
Adding yeast to a new septic tank is not likely to speed up digestion, as the primary function of yeast is to ferment sugars into alcohol and carbon dioxide, rather than to break down waste materials. In fact, adding yeast to a septic tank may disrupt the natural balance of bacteria and other microorganisms that are responsible for breaking down and processing the waste.
The process of digestion in a septic tank is primarily carried out by anaerobic bacteria, which break down organic matter in the absence of oxygen. The rate of digestion depends on a variety of factors, including the size and design of the tank, the nature and amount of waste materials being processed, and the temperature and pH of the tank environment.
Therefore, the statement that adding yeast to a new septic tank speeds up digestion by a factor of 2.7 is not true.
Visit to know more about Digestion:-
brainly.com/question/21470803
#SPJ11
How can you predict the final temperature of a mixture of two substances that start at a different temperatures?
Answer:
If it is a true mixture, the mixing enthalpy is negligible, and there is no reaction or phase change, then you can do this using exclusively the temperatures of the individual compounds and their heat capacities. Any other process that takes place needs to be taken into account separately.
The solution can be found by understanding that we’re only using state variables. You can design any complicated process that starts with the starting situation and ends up at the ending situation, and the state variables will be the same. And sometimes a complicated process is easier to calculate than the simple one-step process, like here when mixing multiple components.
One way that will work is to start by bringing all compounds to the lowest temperature of either of the compounds. All but one of the compounds must be cooled down for this; make sure to calculate for each of the components how much energy is released. Now, mix all the components together. In the simplest situation sketched above you can calculate the heat capacity of the mixture by adding all the heat capacities of the components. Use this total heat capacity to calculate how much you can heat up the mixture using the energy you saved in cooling down the components earlier. This will be your desired end situation.
In case there are any phase changes or other processes in between, you need to take the energy needed for those into account too but in very similar ways.
The half-life of 18F is 110 minutes. If 5 grams of FDG remain after 5 hours and 30 minutes, how much energy was emitted from the patient's body in the form of gamma rays from radioactive decay of the FDG?A. 3.57 x 103 keVB. 1.83 x 102 keV C. 1.19 x 1026 keV D. 3.2 x 1026 keV
the amount of energy emitted from the patient's body in the form of gamma rays from radioactive decay of the FDG is 3.57 x 10^3 keV.
To calculate the amount of energy emitted from the patient's body in the form of gamma rays from radioactive decay of the FDG, we need to use the formula:
E = (N * A * t * e) / m
where E is the energy emitted, N is the number of radioactive atoms, A is the activity of the radioactive substance, t is the time elapsed, e is the energy per decay, and m is the mass of the substance.
We know that the half-life of 18F is 110 minutes, which means that the activity of the substance decreases by half every 110 minutes.
After 110 minutes, the remaining amount of FDG will be 2.5 grams (half of 5 grams). After another 110 minutes (220 minutes total), it will be 1.25 grams. After another 110 minutes (330 minutes total), it will be 0.625 grams. And after another 110 minutes (440 minutes total), it will be 0.3125 grams.
Therefore, after 5 hours and 30 minutes (330 + 110 minutes), the remaining amount of FDG will be 0.625 grams.
To calculate the energy emitted, we need to know the number of radioactive atoms, which can be calculated by dividing the mass by the molar mass and then multiplying by Avogadro's number. The molar mass of FDG is 181 g/mol, so 5 grams of FDG is equal to 5/181 * 6.022 x 10^23 = 1.67 x 10^22 atoms.
The energy per decay of FDG is 0.634 MeV = 634 keV.
Putting all these values into the formula, we get:
E = (1.67 x 10^22 * 0.5 * 330 * 634) / 0.181 = 3.57 x 10^3 keV
Therefore, the answer is A. 3.57 x 10^3 keV.
To know more about gamma rays click here:
https://brainly.com/question/23281551
#SPJ11
What is the focal length of the eyepiece of a Galilean telescope that has an objective focal length of 1.15 mm and a magnification of 3.00
The focal length of the eyepiece of the Galilean telescope is -0.3833 mm.
The focal length of an optical system is a measure of how strongly the system converges or diverges light; it is the inverse of the system's optical power.
A positive focal length indicates that a system converges light, while a negative focal length indicates that the system diverges light.
To find the focal length of the eyepiece of a Galilean telescope, we can use the formula for magnification, which is:
Magnification (M) = -(Focal length of objective) / (Focal length of eyepiece)
Given the objective focal length ([tex]F_{obj}[/tex]) of 1.15 mm and a magnification of 3.00, we can rearrange the formula to solve for the focal length of the eyepiece ([tex]F_{eye}[/tex]):
[tex]F_{eye} = -F_{obj} / M[/tex]
Now, we can plug in the given values:
[tex]F_{eye}[/tex] = -1.15 mm / 3.00
[tex]F_{eye}[/tex] = -0.3833 mm
The negative sign indicates that the eyepiece is a diverging lens, which is typical for a Galilean telescope.
Learn more about telescope:
https://brainly.com/question/18300677
#SPJ11
You and your friend both own a piece of gold of the same weight. But you live on earth, and your friend lives on a planet that has a surface gravity of 1.63m/s^2. Compared to your piece of gold, your friends piece of gold has
Compared to your piece of gold, your friend's piece of gold would weigh more on their planet due to the higher surface gravity.
The weight of an object is directly proportional to the force of gravity acting on it. Therefore, since the gravity on your friend's planet is higher than on Earth, their piece of gold would weigh more. However, the actual mass of both pieces of gold would remain the same regardless of the gravitational force acting upon them. On Earth, the force of gravity is 9.81m/s^2, which means that it pulls objects towards the planet with a greater force than the planet with 1.63m/s^2 surface gravity. Therefore, your friend's piece of gold will be heavier because it is being pulled with a greater force.
To learn more about gravity click here https://brainly.com/question/31321801
#SPJ11