A Machinist Turns the Power on to a Grinding Wheel

question 17

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:

Hoop

A circular band or ring that can be used for various purposes, including sports, jewelry, or as part of mechanisms.

Operant Conditioning

A process of instruction where behavior intensity is adjusted by giving incentives or imposing sanctions.

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The immune system's hypersensitive reaction to a foreign substance, producing symptoms ranging from mild to life-threatening.

Phobic Response

An intense and irrational fear response to a particular object, situation, or activity, leading to avoidance behavior.