更新1:
Please show how you did it
Can someone help me ?
回答 (1)
2020-08-24 4:19 pm
✔ 最佳答案
(a)Period, T
= (5 s) / 20
= 0.25 s
(b)
Frequency, f
= (20) / (5 s)
= 4 Hz
(c)
Speed, v
= 2π(2 m)/(0.25 s)
= 50 m/s
(d)
Centripetal acceleration
= v²/r
= (50 m/s)²/(2 m)
= 1250 m/s²
(e)
Force acting on the rock to keep it in UCM
= Centripetal force
= mv²/r
= (0.005 kg)(50 m/s)²/(2 m)
= 6.25 N
收錄日期: 2021-04-24 08:01:07
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20200824072950AANRY80