A pendulum is set to swing with an amplitude of 4cm and a period of 0.8s.
mass of pendulum bob is 0.5 kg.
take g=10ms-2.
1.) find the length of the pendulum
2.) the max speed of the bob
3.) tension in the string when the bob is at the lowest position
thX!
AL physics machanics
2007-11-02 4:15 am
回答 (1)
2007-11-02 5:22 am
✔ 最佳答案
(1) With the relation of T = 2π√(l/g) for simple pendulum, we have:0.8 = 2π√(l/10)
l/10 = (0.8/2π)2
= 0.0162
l = 0.162 m
(2) T = 0.8 s
ω = 2π/T
= 2.5π rad/s
By vmax = ωA,
vmax = 2.5π × 0.04
= 0.314 m/s
(3) Tension = mg + mv2/r
= 0.5 × (10 + 0.3142/0.162)
= 5.30 N
參考: My physics knowledge
收錄日期: 2021-04-25 22:11:32
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20071101000051KK03305