Equilibrium: In the figure, a 10-lb weight is suspended from two spring scales, each of which has negligible weight. Which one of the following statements about the readings in the scales is true?
A. Each scale will read 5 lb.
B. The top scale will read zero, the lower scale will read 10 lb.
C. The lower scale will read zero, the top scale will read 10 lb.
D. Each scale will show a reading between one and 10 lb, such that the sum of the two is 10 lb. However, exact readings cannot be determined without more information.
E. None of these is true.
Answer: E
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