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): A child is straining to lift a large crate, without success. The crate is too

ID: 1970326 • Letter: #

Question

): A child is straining to lift a large crate, without success. The crate is too heavy. We denote the forces on the crate as follows:
P is the upward force being exerted on the crate by the person
C is the contact force on the crate by the floor, and
W is the weight (force of the earth on the crate).
Which of following relationships between these forces is true, while the person is trying unsuccessfully to lift the crate? (Note: force up is positive & down is negative)
A) P+C<W (b) P+C>W (c) P=C (d) P+C=W

Explanation / Answer

total upward force = P+C total downward force = W as the crate is in equilibrium both must balance so P+C=W.hence the answer is (d)

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