SAT Subject Physics Practice Question 316: Answer and Explanation

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Question: 316

12. A train engine that weighs 5000N stops at the exact center of a bridge. The bridge weighs 75,000N and has two equally spaced pillars that completely support the bridge. The force exerted on the ground by a single pillar

A. 75,000N
B. 40,000N
C. 37,500N
D. 2500N
E. 0N

Correct Answer: B

Explanation:

The correct answer is (B). The two equally spaced pillars each hold one half of the weight of the bridge. Each also supports one half of the weight of the train engine, which is located at the exact center of the bridge.

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