Question

Two blocks that are both 7 kg are connected by a string that massless and frictionless. The are both being pulled by a pulley over the edge of a table.

A. If force is directed to the right and has magnitude 90 N, find the acceleration of the two blocks.

B. For the same direction of F and magnitude, find the tension in the string.

C. Now a different force, still horizontal, is applied to block A, making the tension in the string zero. What is the magnitude of F? Does F point to the left or to the right?

F = Force

A B

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Answer #1

Т. F А AT mg at B motion A) Using equation of ma (i) T-mg at A) F - T ma (ii) lis adding ama F-ng => 90- 7 x 9.8 = a 2 x 7 =>

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