A 100-Kg Box Is Placed on a Ramp

question 21

Multiple Choice

A 100-kg box is placed on a ramp.As one end of the ramp is raised,the box begins to move downward just as the angle of inclination reaches 25°.What is the coefficient of static friction between box and ramp?

• A) 0.15
• B) 0.27
• C) 0.47
• D) 0.95

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