a)How large a horizontal force is required to pull a 1kg pendulum to one side so that the cord hanging the pendulum is 30(degrees) to the vertical?
b)If the horizontal force required is 20N and the angleto the vertical is 60(degrees), find the tension in the cord and the mass of the pendulum.
resolution of forces
2009-01-20 4:34 am
回答 (1)
2009-01-20 6:22 am
✔ 最佳答案
The answer is as follows:圖片參考：http://i277.photobucket.com/albums/kk75/uncle_michael/20090119_phy_01.jpg?t=1232374855
收錄日期: 2021-04-23 23:05:28
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20090119000051KK01609