Cracking the SAT Physics Subject Test: Ch6 Curved and Rotational Motion, RQ 1

題目
An object of mass 0.5 kg, moving in a circular path of radius 0.25 m, experiences a centripetal acceleration of constant magnitude 9 m/s2. What is the object’s angular speed?


相關主題：centripetal force, circular motion, angular speed


解答影片：

詳解：

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Cracking the SAT Physics Subject Test: Ch6 Curved and Rotational Motion, RQ 8

題目：

A moon of Jupiter has a nearly circular orbit of radius R and an orbit period T. Which of the following expression gives the mass of Jupiter?


相關主題：Kepler's law, gravitational force, centripetal force, circular motion

解答影片：

詳解：

評論：這一題是 Kepler's law 的應用題，可以從萬有引力定律以及向心力解出來。公式背得熟的同學可以直接套用，如此便能省略中間的步驟。

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