A block is on a frictionless table, on earth. The block accelerates at 3.0 m/ $\mathrm { s } ^ { 2 }$ when a $20 \mathrm {~N}$ horizontal force is applied to it. The block and table are set up on the Moon where the acceleration due to gravity is 1.62 m/ $\mathrm { s } ^ { 2 }$ . The weight of the block on the Moon is closest to
A)11 N.
B)9.5 N.
C)8.1 N.
D)6.8 N.
E)5.5 N.

Question

Quizplus · Accepted Answer

Weight is a force, and on the Moon, the weight of the block is less than on Earth because the acceleration due to gravity is less. The weight of the block on the Moon is:$$W = mg = (1.62 \mathrm{~m/s^2})(5 \mathrm{~kg}) = 8.1 \mathrm{~N}$$Therefore, the closest choice is C) 8.1 N.

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