A Box M = 20 Kg) Is Sitting on a Horizontal

question 24

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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