1. Select the option which will cause a worker to do the maximum amount of work
A)using a lever to lift 100 newtons up 4 meters on to a shelf (This one?)
B) using her hands to lift 200 newtons up 1 meter on to a table
C) using a ramp to lift a 200 newton box up 1 meter into a truck
D) using a pulley to lift a 100 newton box up 3 meters onto a platform
2. Yours friends are in a debate over who does the most work. In which situation is the most work being done.
A)Jesse hauls 9 kg bags of mulch 200m with an average force of 90n
B) Stella mops the restaurant with an average force of 60N for 250m
C)Peyton pushes his lawnmower with an average force of 75 N for 500 M the lawnmower weights 10 kg. (This one?)
D) Addie stocks 10 kg boxes of cans on the shelves of the grocery store with an average force of 30 N for a total of 1km
3. A running back holds a 0.25 kg football and runs 100 m down the football field. In addition to scoring six points for his team, he also ___ work on the football.
A) no
B) 25 J of
C) 100 J of
D) 250 J of
4. Lulu gets a flat tire on her way to school. She gets out and attempts to push the car. For 60 minutes, she pushes but the car never moves. How much work did Lulu perform as she unsuccessfully tried to move the car.
A) She did 60 minutes of hard work
B) No work was done since the car never moved
C) We would have to know how much Lulu weighed in order to calculate the force she exerted
D) She performed a lot of work but was simply not strong enough to move the car herself. (This one?)
5. A 3.0 kg cart rolls down a hill. Assume that the height of the cart changes from a maximum of 4.0 meters at the top of the hill to 0.0 meters at the bottom. The speed of the cart changes from 0.0 m/s to 3.0 m/s. How much kinetic energy does the cart have when it is half-way down the hill
A)6.0J
B) 12.0J (This One?
C)58.8 J
D) 117.6J
1. The option that will cause a worker to do the maximum amount of work is D) using a pulley to lift a 100 newton box up 3 meters onto a platform.
2. The situation in which the most work is being done is C) Peyton pushes his lawnmower with an average force of 75 N for 500 M. The work done can be calculated by multiplying the force exerted by the distance moved, so in this case, it would be (75 N * 500 M) = 37,500 J.
3. The answer is B) 25 J of. Work is calculated by multiplying the force applied by the distance moved in the direction of the force. In this case, the running back applies a force to hold the football while running, but since the football does not move, the distance is 0. Therefore, the work done on the football is 0.25 kg * 100 m = 25 J.
4. The answer is B) No work was done since the car never moved. Work is only done when there is a displacement in the direction of the force applied. In this case, even though Lulu was pushing against the car for 60 minutes, if the car did not move, then no work was done.
5. The answer is C) 58.8 J. The change in kinetic energy is equal to the work done, which can be calculated using the formula W = ΔKE = (1/2) * m * (v^2), where m is the mass and v is the velocity. Since the cart is halfway down the hill, its height has decreased by half, so the potential energy has also decreased by half. This decrease in potential energy is equal to the increase in kinetic energy. Therefore, ΔKE = (1/2) * m * (v^2) = (1/2) * 3.0 kg * (3.0 m/s)^2 = 13.5 J. However, since the potential energy decreases by half, the actual kinetic energy when the cart is halfway down the hill is 13.5 J / 2 = 6.75 J = approximately 6.0 J.
1. To determine which option will cause a worker to do the maximum amount of work, we need to use the formula for work, which is given as work = force x distance. We want to find the option with the highest value for work.
A) The work done in this option would be 100 newtons x 4 meters = 400 joules of work.
B) The work done in this option would be 200 newtons x 1 meter = 200 joules of work.
C) The work done in this option would be 200 newtons x 1 meter = 200 joules of work.
D) The work done in this option would be 100 newtons x 3 meters = 300 joules of work.
Therefore, option A) using a lever to lift 100 newtons up 4 meters on to a shelf will cause the worker to do the maximum amount of work.
2. To determine in which situation the most work is being done, we need to again use the formula for work, which is work = force x distance. We want to find the option with the highest value for work.
A) The work done in this option would be 90 newtons x 200 meters = 18,000 joules of work.
B) The work done in this option would be 60 newtons x 250 meters = 15,000 joules of work.
C) The work done in this option would be 75 newtons x 500 meters = 37,500 joules of work.
D) The work done in this option would be 30 newtons x 1000 meters = 30,000 joules of work.
Therefore, option C) Peyton pushing his lawnmower with an average force of 75 N for 500 M, with the lawnmower weighing 10 kg, represents the situation where the most work is being done.
3. The work done on an object can be calculated using the formula work = force x distance. In this scenario, the running back holds the football while running, so no external force is pushing or pulling the football. Therefore, no work is being done on the football. The correct answer is A) no.
4. Work is calculated using the formula work = force x distance. Even though Lulu attempted to push the car, if the car never moved, no work was done on the car. Therefore, the correct answer is B) No work was done since the car never moved.
5. The kinetic energy of an object can be calculated using the formula kinetic energy = 1/2 x mass x velocity^2. In this scenario, when the cart is halfway down the hill, it has covered half the distance, which means it has fallen 2.0 meters. The speed of the cart is given as 3.0 m/s.
Using the formula, the kinetic energy of the cart when it is halfway down the hill would be:
kinetic energy = 1/2 x mass x velocity^2
= 1/2 x 3.0 kg x (3.0 m/s)^2
= 1/2 x 3.0 kg x 9.0 m^2/s^2
= 13.5 joules (rounded to one decimal place)
Therefore, the correct answer is C) 13.5 J.
1. Select the option which will cause a worker to do the maximum amount of work
A)using a lever to lift 100 newtons up 4 meters on to a shelf (This one?CORRECT)
B) using her hands to lift 200 newtons up 1 meter on to a table
C) using a ramp to lift a 200 newton box up 1 meter into a truck
D) using a pulley to lift a 100 newton box up 3 meters onto a platform
2. Yours friends are in a debate over who does the most work. In which situation is the most work being done.
A)Jesse hauls 9 kg bags of mulch 200m with an average force of 90n
B) Stella mops the restaurant with an average force of 60N for 250m
C)Peyton pushes his lawnmower with an average force of 75 N for 500 M the lawnmower weights 10 kg. (This one?CORRECT)
D) Addie stocks 10 kg boxes of cans on the shelves of the grocery store with an average force of 30 N for a total of 1km
3. A running back holds a 0.25 kg football and runs 100 m down the football field. In addition to scoring six points for his team, he also ___ work on the football.
A) no
B) 25 J of...WHAT IS .25*100?
C) 100 J of
D) 250 J of
4. Lulu gets a flat tire on her way to school. She gets out and attempts to push the car. For 60 minutes, she pushes but the car never moves. How much work did Lulu perform as she unsuccessfully tried to move the car.
A) She did 60 minutes of hard work
B) No work was done since the car never moved
C) We would have to know how much Lulu weighed in order to calculate the force she exerted
D) She performed a lot of work but was simply not strong enough to move the car herself. (This one? THE BEST ANSWER, AS THE SWEAT ON HER BROW PROBABLY ATTESTS TO. VERY POOR QUESTION)
5. A 3.0 kg cart rolls down a hill. Assume that the height of the cart changes from a maximum of 4.0 meters at the top of the hill to 0.0 meters at the bottom. The speed of the cart changes from 0.0 m/s to 3.0 m/s. How much kinetic energy does the cart have when it is half-way down the hill
A)6.0J
B) 12.0J (This One? CORRECT
C)58.8 J
D) 117.6J