A 50 kg person on a trampoline bounces to a height of 5.5 m. On their second bounce they end up only 4.5 m high. On their third bounce they end up 6.5 m high.
If they just bounced without using any effort, how much energy was lost in the second bounce to sound and heat?
How much energy did the person need to produce on the third bounce (include the amount needed to overcome the energy loss found in the second bounce)?
On the third bounce, you measured the deflection of the trampoline to be 0.25 m. What average force did the person apply to the trampoline to get to 6.5 m high?
bbsang2 说道: 无题
2022-01-14 16:39:11
dingjerry 说道: 无题
2022-01-14 16:45:00
哦,那我把文字拷贝下来试试看:
A 50 kg person on a trampoline bounces to a height of 5.5 m. On their second bounce they end up only 4.5 m high. On their third bounce they end up 6.5 m high.
If they just bounced without using any effort, how much energy was lost in the second bounce to sound and heat?
How much energy did the person need to produce on the third bounce (include the amount needed to overcome the energy loss found in the second bounce)?
On the third bounce, you measured the deflection of the trampoline to be 0.25 m. What average force did the person apply to the trampoline to get to 6.5 m high?
optimas 说道: 无题
2022-01-14 16:48:09
dingjerry 说道: 无题
2022-01-14 16:54:53
不知道啊,你说要用到胡克定律的话,也没给系数啊。
所以可能性就是要6.5米减去或者加上这个0.25米,那到底是要减还是加呢?
Slowking 说道: 无题
2022-01-14 18:13:48
应该是不加也不减,不是弹簧, 不适用胡克定律。
是除。
总能量 就是 150 公斤米, 除以0.25米的距离, 平均就是600公斤力。
自然反弹, 每次能量损失 50 公斤 X 1 米。
从4.5 到 6.5 要50公斤 x 2 米 , 加上 能量损耗 50 公斤 X 1 米。
teddybearvan 说道: 无题
2022-01-14 18:15:03
teddybearvan 说道: 无题
2022-01-14 18:17:00
www.numerade.com/ask/q...ter-20165/
physics.stackexchange....the-object
dingjerry 说道: RE:
2022-01-14 18:34:01
www.numerade.com/ask/q...ter-20165/
physics.stackexchange....the-object
没用,我估计这题用不到胡克定律
dingjerry 说道: RE:
2022-01-14 18:34:30
没办法,辅导孩子功课。 就怕什么时候我都不会做了,该咋办?
Slowking 说道: Re: RE:
2022-01-14 18:37:03
没办法,辅导孩子功课。 就怕什么时候我都不会做了,该咋办?
几年级的题目啊啊