A Box (M = 20 Kg)is Sitting on a Horizontal

question 51

Multiple Choice

A box (m = 20 kg) is sitting on a horizontal surface.It is connected to a massless hook by a light string passing over a massless pulley wheel.The coefficients of friction between the box and the surface are 0.50 (static) and 0.30 (kinetic) .On top of m is a second box M of mass 20 kg.The coefficients of friction between the boxes m and M are 0.80 (static) and 0.60 (kinetic) .How much weight needs to be added to the hook until the box just begins to move.

• A)10 kg
• B)98 kg
• C)20 kg
• D)16 kg
• E)200 kg

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