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

A horizontal spring with a spring constant k = 126 kN/m is relaxed from an extension x = 9.3 cm back to its unstretched length. Calculate the change in potential energy in Joules to 2 s.f. Your Answer: Answer

A 72.0 kg swimmer jumps into the old swimming hole from a tree limb that is 3.75 m above the water. 1) Use energy conservation to find his speed just as he hits the water if he just holds his nose and drops in. Express your answer in meters per second.   2) Use energy conservation to find his speed just as he hits the water if he bravely jumps straight up (but just beyond the board!) at 2.20 m/s. Express your answer in meters per second.   3) Use energy conservation to find his speed just as he hits the water if he manages to jump downward at 2.20 m/s. Express your answer in meters per second.

In the figure, a constant external force P = 300 N is applied to a 20.0 kg box, which is on a rough horizontal surface. While the force pushes the box a distance of 8.00 m, the speed changes from 0.500 m/s to 2.60 m/s. The work done by friction during this process is closest to P 30° 20 kg -8.0 m O A. +2209 J ОВ.-1948 J OC.-2013 J O D.+1948 J O E. +2013 J

1. So imagine a wombat named Horace at rest. It's somehow on the top of a long telephone pole. It has a mass of 44.0 kg. It then slides down the pole reaching a final speed of 5.95 m/s just before reaching the bottom 12.4  later.  (a) Calculate the change in the gravitational potential energy of Horace from top to bottom. (b) What is Horace's kinetic energy just before reaching the bottom?  (c) What is the average force of friction that acts on Horace while sliding?

18. A cart is loaded with à brick and pulled at constant speed along an inclined plane to the height of a seat- top. If the mass of the loaded cart is 3.0 kg and the height of the seat top is 0.45 meters, then what is the potential energy of the loaded cart at the height of the seat-top? 19. A 75-kg refrigerator is located on the 70th floor of a skyscraper (300 meters above the ground) What is the potential energy of the refrigerator? 220. TTHE potential energy of a 40-kg cannon ball is 14000 J. How high was the cannon ball to have this mouth potential energy? Ce %23 8. 9. W d f g h b n m C

A rope exerts a force F⃗  on a 20.0-kg crate.  The crate starts from rest and accelerates upward at 5.00 m/s2 near the surface of the earth. What is the kinetic energy of the crate when it is 4.0 m above the floor ?

A spring with a spring constant k = 852 N/m is compressed from its unstretched length to a length of 9.2 cm. Calculate the change in potential energy in Joules to 2 s.f. Your Answer: Answer

A 500N girl is in a tire swing that is attached to a rope 3m long and loops-the-loop. Determine the gravitational potential energy of the girl when the ropes are horizontal.

A 40 N object has 80 joules of potential energy. The object is at a height of 0.5 meters. True or false