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 說道: 無題
2022-01-14 16:39:11
dingjerry 說道: 無題
2022-01-14 16:45:00
哦,那我把文字拷貝下來試試看:
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 說道: 無題
2022-01-14 16:48:09
dingjerry 說道: 無題
2022-01-14 16:54:53
不知道啊,你說要用到胡克定律的話,也沒給系數啊。
所以可能性就是要6.5米減去或者加上這個0.25米,那到底是要減還是加呢?
Slowking 說道: 無題
2022-01-14 18:13:48
應該是不加也不減,不是彈簧, 不適用胡克定律。
是除。
總能量 就是 150 公斤米, 除以0.25米的距離, 平均就是600公斤力。
自然反彈, 每次能量損失 50 公斤 X 1 米。
從4.5 到 6.5 要50公斤 x 2 米 , 加上 能量損耗 50 公斤 X 1 米。
teddybearvan 說道: 無題
2022-01-14 18:15:03
teddybearvan 說道: 無題
2022-01-14 18:17:00
www.numerade.com/ask/q...ter-20165/
physics.stackexchange....the-object
dingjerry 說道: RE:
2022-01-14 18:34:01
www.numerade.com/ask/q...ter-20165/
physics.stackexchange....the-object
沒用,我估計這題用不到胡克定律
dingjerry 說道: RE:
2022-01-14 18:34:30
沒辦法,輔導孩子功課。 就怕什麼時候我都不會做了,該咋辦?
Slowking 說道: Re: RE:
2022-01-14 18:37:03
沒辦法,輔導孩子功課。 就怕什麼時候我都不會做了,該咋辦?
幾年級的題目啊啊