As shown in the diagram above, a 2 -kilogram mass lies on a horizontal rough surface while a 1 -kilogram mass hangs vertically. The string between them is massless, and the pulley is both massless and frictionless. What minimum coefficient of friction will keep the blocks at rest? (A) 0.1 (D) 0.4 (B) 0.2 (E) 0.5 (C) 0.3
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This is simply the mass times the acceleration due to gravity, which is approximately 9.8 m/s^2. So, the force of gravity is 1 kg * 9.8 m/s^2 = 9.8 N. This force is pulling the 2-kilogram mass horizontally. However, for the blocks to remain at rest, this force Show more…
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As shown in the diagram above, a 2 -kilogram mass lies on horizontal rough surface while a 1-kilogram mass hangs vertically. The string between them is massless, and the pulley is both massless and frictionless. What minimum coefficient of friction will keep the blocks at rest? (A) 0.1 (B) 0.2 (C) 0.3 (D) 0.4 (E) 0.5
A 3.0-kilogram mass lies on a rough horizontal surface. It is attached to a 1.0- kilogram mass by a string draped over a pulley as shown in the diagram above. What minimum coefficient of friction is needed in order for the blocks to remain at rest? (A) 0.25 (B) 0.33 (C) 0.50 (D) 0.67 (E) 0.75
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