Space Time & Motion A.2 Forces & Momentum (id: 94acb9092)

本题目来源于试卷: Space Time & Motion A.2 Forces & Momentum，类别为 IB物理学

[单选题]
A roller coaster loop ha74 s d4 pdu;evzsj+bl/s a radius Rg xow (w1gh-9q as shown in the diagram. The combined mass of a car and the passengers is Mgo(-q wg1hx9w


When the car goes around the top of the loop, the normal reaction force of the track on the car is equal to half of the weight of the car and passengers.
Which expression gives the kinetic energy at the top of the loop?

A. 0
B. $\frac{RMg}{4}$
C. $\frac{3RMg}{4}$
D. RMg


参考答案:  C


本题详细解析:
At the top of the loop, the centripetal forrr++0 yle)7y os fvks8ce is the vector sum of the combined weight of the car and the passengers, and the normal f 0rleo+)vkr8s+7sfyy orce of the track on the car.

微信扫一扫，分享更方便