A Machinist Turns the Power on to a Grinding Wheel

question 7

Multiple Choice

A machinist turns the power on to a grinding wheel, which is at rest at time t = 0.00 s. The wheel accelerates uniformly for 10 s and reaches the operating angular velocity of 25 rad/s. The wheel is run at that angular velocity for 37 s and then power is shut off. The wheel decelerates uniformly at 1.5 rad/s² until the wheel stops. In this situation, the time interval of angular deceleration (slowing down) is closest to:

• A) 17 s
• B) 15 s
• C) 19 s
• D) 21 s
• E) 23 s

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Definitions:

Pseudohypertrophic Muscular Dystrophy

A genetic disorder characterized by muscle weakness and the appearance of enlarged muscles due to fat and connective tissue buildup, also known as Duchenne muscular dystrophy.

Genetic Counseling

A communication process that aims to advise individuals and families about the nature, inheritance, and implications of genetic disorders.

Duchenne

Refers to Duchenne Muscular Dystrophy, a genetic disorder characterized by progressive muscle degeneration and weakness.

Spastic Cerebral Palsy

A form of cerebral palsy characterized by stiff and difficult movement due to muscle tightness and spasms, resulting from brain damage.