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 hq:7a:b72 zfm/ixqkf3 z)iie das a radius R as shown in the diasgnc *qby/+p+gram. The combined mass of qgysn+b+pc*/ a car and the passengers is M


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 coswr e)og9cm2, ko1 7jentripetal force is the vector sum of the combined weight of the car and the passengers, an mo,1sjwcog e o972k)rd the normal force of the track on the car.

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