Block A, with a Mass of 50 Kg, Rests on a Horizontal

question 11

Multiple Choice

Block A, with a mass of 50 kg, rests on a horizontal table top. The coefficient of static friction is 0.40. A horizontal string is attached to A and passes over a massless, frictionless pulley as shown. The smallest mass m_B of block B, attached to the dangling end, that will start A moving when it is attached to the other end of the string is:

• A) 20 kg
• B) 30 kg
• C) 40 kg
• D) 50 kg
• E) 70 kg

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