SAT Subject Physics Practice Question 317: Answer and Explanation

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Question: 317

13. 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 upward force exerted by each pillar

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

Correct Answer: B


The correct answer is (B). Each pillar supports exactly one-half of the weight of the train engine, which is 2,500N and is one-half the weight of the bridge.

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