1) A 40 kg hay bale is lifted to a height of 30 meters and then released to fall
ID: 1413678 • Letter: 1
Question
1) A 40 kg hay bale is lifted to a height of 30 meters and then released to fall freely. What are the potential energy and kinetic energy at 13 meters above the ground?
Potential Energy = XXXX Joules Kinetic Energy = XXXX Joules
2) A simple pendulum is 1.6 meters long and has 8 kg bob. How much work is needed to move the pendulum from it's lowest point to a horiztonal position?
Work Input = XXXX Joules
3) A 3.9 kg ball drops a vertical distance of 33 meters and rebounds to a height of 15 meters. How much energy was lost?
Work Out = XXXX Joules
4) A roller coaster, which weighs 1,350 pounds, starts at a heigh of 200 feet. If the roller coaster comes to a stop at the second hill with a height of 140 feet, how much energy was lost to friction?
Wo = XXXX foot*lbs
Explanation / Answer
1) potential energy = 40 * 9.8 * 13 = 5096 J
kinetic energy = 40 * 9.8 * (30 - 13) = 6664 J
2) work is needed to move the pendulum = 8 * 9.8 * 1.6 = 125.44 J
3) energy was lost = 3.9 * 9.8 * (33 - 15)
= 687.96 J
4) energy was lost to friction = 1350 * (200 - 140)
= 81000 foot*lbs
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