A Machinist Turns on the Power to a Grinding Wheel $38 \mathrm { rad } / \mathrm { s }$

question 66

Multiple Choice

A machinist turns on the power to a grinding wheel at time t = 0 s. The wheel accelerates uniformly from rest for 10 s and reaches the operating angular speed of $38 \mathrm { rad } / \mathrm { s }$ The wheel is run at that angular speed for 30 s and then power is shut off. The wheel slows down uniformly at $2.1 \mathrm { rad } / \mathrm { s } ^ { 2 }$ until the wheel stops. In this situation, what is the angular acceleration of the wheel between $t = 0 \mathrm {~s}$ and $t = 10 \mathrm {~s} ?$

• A) 3.8 rad/ \(s ^ { 2 }\)
• B) 4.6 rad/ \(s ^ { 2 }\)
• C) 5.3 rad/ \(s ^ { 2 }\)
• D) 6.1 rad/ \(s ^ { 2 }\)
• E) 6.8 rad/ \(s ^ { 2 }\)

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Definitions:

Ancillary Behaviors

Supplementary or additional behaviors that support the primary behavior or outcome being studied.

Interpersonal Manner

relates to the way individuals interact with each other, including their communication style, behaviors, and emotional expressions during interactions.

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A detailed examination or analysis of data or phenomena at a very small or specific scale.

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Actions performed through speaking or writing, such as promising, ordering, greeting, or apologizing, which accomplish a social function.