15. A 12 kg crate is pushed up an incline from point A to point B as shown in the figure: B 7.5 m 2.5 m The height of the points A and B from the ground are given in the figure. What is the change in the gravitational potential energy of the crate? A. 590J B. -590] C. 950] D. -950 J

7. A person pushes a box up an incline with constant force, and after calculating how much work they did on the box summed with how much work gravity did on the box they find a non-zero positive result, i.e. ?person>Wgravity. What are two explanations of where the “extra” work done by the person on the box went?

In the figure shown, if the mass (m36 Kg) is moving with constant speed and traveled a distance d=10 m, what is the work done in Joules by frictional force? Given that F =23N and e =53°. A -415.2 B. None C. -553.7 D. -138.4 E. -276.8

In which scenario below does the ball have more gravitational potential energy when sitting at the top. Why?   A. The ball travels up to a height of 3 ft.   B. The ball travels straight up the column to a height of 3 ft.

How much work (in J) must be done to lift a stack of bricks, which has a mass of 50 kg, from the ground to a height of 6 m? (g = 10 m/s?) A. 300J B. 500 J C. 3,000) D. 5,000J E. zero J

A 25 N block is being pushed up on a plane inclined at an angle of 30° with the horizontal by a 46 N force applied parallel to the plane. The block moves 3.0m up the inclined plane. How much work is done on the block by a.) gravitational force, b.) force, c.) friction force, and d.)normal force. The coefficient of friction H, is 0.2. FN wsin e wcos 0 W Activate Windows Goto Senioa

You push a shopping cart a certain distance with a certain force. If you apply that same force, but push the shopping cart TWICE the distance as in the first case, the work you do in this second case is _________ as the work done in the first case.   a. the same amount.   b. four times as much.   c. half as much.   d. twice as much.

I need the answer as soon as possible

39. A 4.0-kg block is lowered down a 37° incline a distance of 5.0 m from point A to point B. A horizontal force 10 N) is applied to the block between A and B as shown in the figure. The kinetic energy of the block at A is 10 J and at B it is 20 J. How much work is done on the block by the force of friction between A and B? B 370 a. -58 J b. -53 J ⠀ c. -68 J d. -63 J e. -47 J

1. A roller-coaster car with a mass of 1200 kg starts at rest from a point 20 m above the ground. At point B, it is 9 m above the ground. [Express your answers in kilojoules (kJ).] a. What is the initial potential energy of the car? b. What is the potential energy at point B? c. If the initial kinetic energy was zero and the work done against friction between the starting point and point B is 40 000 J (40 kJ), what is the kinetic energy of the car at point B 2. The time required for one complete cycle of a mass oscillating at the end of a spring is 0.80 s. What is the frequency of oscillation?