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

question 74

Multiple Choice

The figure shows a block of mass m resting on a 20° slope. The block has coefficients of friction $\mu _ { \mathrm { S } } = 0.64$ and $\mu \mathrm { k } = 0.54$ with the surface of the slope. 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