physics

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[匿名]

2009-11-04 11:22 pm

a block with a mass of 5.7kg slides on a frictionless table with a speed of 1.0m/s. it is brought to rest by compressing a spring in its path. by how much is the spring compressed if its force constant is 1500 N/m?

回答 (2)

Chau

2009-11-05 12:05 am

✔ 最佳答案

KE loss=PE gain
mvv/2=kxx/2
5.7*1*1/2=1500*x*x/2
x=0.0616m

參考: myself

👍 0 👎 0

2009-11-05 12:14 am

樓上已經有答案
只想說一下解題的方向﹗

一句話："能量只會轉換而不會消失﹗"

起初的能量+中途加入的能量(如果有的話)=最終的能量

如你這一題是:

車的動能 = 彈弓的位能

只要找出相應的公式，代入數字就可計出未知數。

👍 0 👎 0

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