1.Was the mechanical energy of the falling mass conserved?Discuss the possible sources of error.2.When a ball at rest is dropped,can it rebound to a greater height than its original height?3.A 2 kg rock is released from rest at a height of 29 m.Ignor

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1.Wasthemechanicalenergyofthefallingmassconserved?Discussthepossiblesourcesoferror.2.Whenaballatrest

1.Was the mechanical energy of the falling mass conserved?Discuss the possible sources of error.2.When a ball at rest is dropped,can it rebound to a greater height than its original height?3.A 2 kg rock is released from rest at a height of 29 m.Ignor
1.Was the mechanical energy of the falling mass conserved?Discuss the possible sources of error.
2.When a ball at rest is dropped,can it rebound to a greater height than its original height?
3.A 2 kg rock is released from rest at a height of 29 m.Ignore air resistance and determine the kinetic energy,gravitational potential energy,and total mechanical energy at each of the following heights:20m; 15m; 5m; 9m.
4.A man runs with a speed of 6 m/s off a platform that is 10 m above the water.How fast if he moving when he hits the water?Ignore air resistance.
朋友,可以用英文答吗?

1.Was the mechanical energy of the falling mass conserved?Discuss the possible sources of error.2.When a ball at rest is dropped,can it rebound to a greater height than its original height?3.A 2 kg rock is released from rest at a height of 29 m.Ignor
1.If the retarded force can be negligible,mechanical energy of the falling mass conserved.The error source comes from resistance,buoyancy and other similar things.
2.The ball can't rebound to a greater height than its original height because of resistance.If the retarded force can be negligible,the ball only can rebound to its original height.

下落物体的机械能会改变马

嗯··等我看看哦~~嘿嘿··
1.在只有重力做功的情况下机械能守恒··
if there is
2.不可能,他问的是一个小球下落后反弹的高度可能超过原来所在高度吗》???
3.
4.
汗啊··急吗?英文答还真要思考会
现在在上班··
抽空给你答哦...

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嗯··等我看看哦~~嘿嘿··
1.在只有重力做功的情况下机械能守恒··
if there is
2.不可能,他问的是一个小球下落后反弹的高度可能超过原来所在高度吗》???
3.
4.
汗啊··急吗?英文答还真要思考会
现在在上班··
抽空给你答哦

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