大一的力學題目，本身是電類，力學有數字的題目比較會算，這種偏代數的題目就比較不知如何下手
這邊有三題~只解一題也是可以~感恩
大一《普通物理-運動學》求解?
回答 (1)
2015-12-11 9:37 pm
✔ 最佳答案
(3) F = Friction = ? given θ & vf = friction coefficient = tanθ
F = M*g*tanθ
(3b) L = ? by Energy equation
0.5M*v^2 = F*L
=> L = 0.5M*v^2/F
= 0.5M*v^2/(M*g*tanθ)
= v^2/(2g*tanθ)
(3a) a = ?
0 - v^2 = 2a*L ;;; The 3rd Newton's formula
a = (0 - v^2)/2L
= -v^2/2L
= -v^2*2g*tanθ/2v^2
= - g*tanθ
(3c) As the former computation
收錄日期: 2021-04-30 20:18:33
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20151208035401AAE40MF