A Block of Mass M Is Held Motionless on a Frictionless

question 28

Multiple Choice

A block of mass M is held motionless on a frictionless inclined plane by means of a string attached to a vertical wall as shown in the drawing.
-Assume the plane is not frictionless and the string breaks, what minimum value of the coefficient of static friction, $\mu$ _s, would prevent the block from sliding down the inclined plane?

• A)zero
• B)1
• C)cos \(\theta\)
• D)sin \(\theta\)
• E)tan \(\theta\)

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