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 has a0 gc-a bqb;2pfi fsui ppw8/: n6)egb- radius R as shown in the diagram. The combined mass of a car)/i6enpfgi-pb8w u: s 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 centripetj4t vsqcm 6nt* 8ly 8p1q5g8uval force is the vector sum of the combined weight of the car and the passengers, and the normal force of the track on j 1 s86mty45*uvptgl88c nvqqthe car.

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