發問時間: 教育與參考其他:教育 · 1 0 年前

問物理題目有關圓周運動?

1. A small container of water is placed on a turntable inside a microwave oven, at a radius of 12m from the center. The turntable rotates steadily, turning one revolution

in each 7.25s. What angle dose the water surface make with the horizontal?

2.A string under a tension of 50N is used to whirl a rock in a horizontal circle of

radius 2.5m at a speed of 20.4m/s on a frictionless surface. As the string is pulled in, the speed of the rock increases. When the string is 1m long and the speed of the rock is 51m/s, the string breaks. What is the breaking strength, in newtons, of the

string?(圖為一石頭繫在一繩上放在桌面,而繩穿過桌面中心並用手拉動,而石頭作圓周運動)

已更新項目:

第1題答案為0.527度

第2題可不用回答了^^

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