The Figure Shows a Block of Mass M Resting on a 20°

question 140

Multiple Choice

The figure shows a block of mass m resting on a 20° slope.The coefficients of friction between the block and the surface of the slope are $\mu _ { \mathrm { S } } = 0.64$ and $\mu _ { \mathrm { k } } = 0.54$ It is connected using a very light string over an ideal pulley to a hanging block of mass 2.0 kg.The string above the slope pulls parallel to the surface.What is the minimum mass m so the system will remain at rest when it is released from rest?

• A)2.1 kg
• B)3.3 kg
• C)1.3 kg
• D)3.6 kg

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