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

---

Definitions:

Overtime Pay

Additional compensation awarded to employees who work beyond the standard hours prescribed by their employment contract or by labor law.

Test Pilots

Skilled aviators who fly new or modified aircrafts to validate design objectives, ensure safety, and recommend improvements.

Airplane Makers

Companies and manufacturers that specialize in the design and production of aircraft.

Required Skills

The specific abilities, knowledge, and expertise that are necessary for an individual to perform a job effectively.