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A block R of mass 100 kg is placed on a block S of mass 150 kg as shown in the figure. Block R is tied to the wall by a mass less and in extensible string PQ. If the coefficient of static friction for all surfaces is 0.4, the minimum force F(in kN) needed to move the block S is
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- 0.69
- 0.88
- 0.98
- 1.37
Correct Option: D
F = μ (Ws + WR) + μ WR
F = μ (Ws + 2WR)
= 0.4 (150 + 2 × 1000)9.81 = 1.37 kN
