SAT Subject Physics Practice Question 653: Answer and Explanation

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Question: 653

4. A 400N box is suspended motionless from a steel frame by two ropes, A and B, which hang straight up and down. Which of the following statements about the tension in the two ropes is correct?

A. The tension in rope A is larger than in rope B.
B. The tension in rope B is larger than in rope A.
C. The tension in the two ropes is greater than 400N.
D. The tension in the two ropes is less than 400N.
E. The tension in the two ropes is equal to 400N.

Correct Answer: E

Explanation:

The correct answer is (E). According to the first condition of equilibrium, the sum of all the applied forces must equal zero if an object is not to move.

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