Mark pushes his broken car 150 m down the block to his friend’s house. He has to exert a 110 N horizontal force to push the car at a constant speed. How much thermal energy is created in the tires and road during this short trip?

Karen lifts a 10.0 kg box up from the ground to a height of 1.50 meters. He then lowers the box to 0.630 m above the ground. What is the change in potential energy of the box in Joules?  change in potential energy between final and inital height.

At rest, a 59.0 kg cheetah can run at a top speed of 32.7 m/s, according to this video.   In terms of net work (in J), how fast can a cheetah reach its maximum speed? A food Calorie is equal to 4186 J. For the cheetah to reach top speed, how many Calories of net work are needed? Cheetah's body produces a lot of energy, yet the amount calculated here is only a small fraction of what it needs.

A 0.5 kg ball is thrown from the top of a 20 m high balcony at an angle of 45° and with a speed of 20 m/s. What is the mechanical energy of the ball when it is 10 m above the ground? Ignore air resistance. Take the 0 of potential energy to be when the ball is on the ground and use g = 10 m/s2.

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Justin, with a mass of 50 kg, is going down an 8.0-m-high water slide. He starts at rest, and his speed at the bottom is 12 m/s. How much thermal energy is created by friction during his descent? Express your answer with the appropriate units. Eth = μA Value Units ?

As usual, Hampus is out cycling. He is driving at 30.0 km/ h when he comes to a small hill that is 11 m high and 350 m long. Hampus and the bike weigh 95 kg together. a) What kinetic energy does Hampus have just before the hill? b) How much extra energy must Hampus produce to maintain a constant speed (30.0 km/ h) throughout the hill? c) How long does it take him to drive up the hill? d) What effect must he develop on the hill? Once at the top of the hill, the ground is flat. Hampus is tired and stops pedaling. After 12s the cycle stops. e) How big is the coefficient of friction? You can assume that is constant throughout the deceleration and that it includes both drag and rolling resistance.

A 2.0kg block starts with a speed of 10. m/s at the bottom of a plane inclined at 35° to the horizontal. The coefficient of sliding friction between the block and the plane is 0.30. use the work-energy theorem to determine how far the block slides along the plane before momentarily coming to rest. I know the answer is 6.2, I just don’t know how to get to it.

4. This Olympic skeleton athlete slides down an icy track head first. The track has many twists and turns with a total height of 102.75 m. If the 99.375 kg man has a speed of 27 m/s at the bottom, what was the total work done on him by friction and air resistance slowing him down? (In other words, what was the energy lost to friction and air resistance?) He starts from rest at the top. Previous submissions:

A 69.0-kg athlete leaps straight up into the air from a trampoline with an initial speed of 8.9 m/s. The goal of this problem is to find the maximum height she attains and her speed at half maximum height. What is the gravitational potential energy associated with the athlete? Write a general equation for energy conservation in this case and solve for the maximum height. Substitute and obtain a numerical answer. Write the general equation for energy conservation and solve for the velocity at half the maximum height. Substitute and obtain a numerical answer