An Object of Mass, M, Is Placed in an Arc $\mu$

question 12

Multiple Choice

An object of mass, m, is placed in an arc of a circle of radius, r. The coefficient of kinetic friction between the object and the surface of the arc is $\mu$ _k. What is the work done by friction in going from P₁ and P₂?

• A) -\(\mu\) _kmg r (cos(\(\theta\)₂)-cos(\(\theta\)₁))
• B) -\(\mu\)_kmg r (sin(\(\theta\)₂)-sin(\(\theta\)₁))
• C) -\(\mu\)_kmg r cos(\(\theta\)₂) sin(\(\theta\)₁)
• D) -\(\mu\)_kmg r sin(F\(\theta\)₂)cos(\(\theta\)₁)
• E) none of the above

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