A Disc-Shaped Grindstone of Mass 3

question 64

Multiple Choice

A disc-shaped grindstone of mass 3.0 kg and radius 8.0 cm is spinning at 600 rev/min.After the power is shut off,a man continues to sharpen his axe by holding it against the grindstone until it stops 10 s later.What is the average torque exerted by the axe on the grindstone?

• A)9.6 mN · m
• B)0.12 N · m
• C)0.75 N · m
• D)0.60 kN · m
• E)0.060 N · m

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Definitions:

Cyclical Beta

A measure of how sensitive a stock's price is to economic cycles, with higher values indicating greater sensitivity.

Market Risk Premium

The additional return over the risk-free rate that investors require to compensate them for the risk of holding a risky market portfolio.

Countercyclical Beta

Countercyclical beta refers to the measure of an asset’s return sensitivity in opposition to market trends, often gaining value in downturns.

Fama-French Three-factor Model

An asset pricing model that expands on the capital asset pricing model by including size risk and value risk factors in addition to market risk.