A Modern Version of Joule's Experiment Has You Turn a Crank

question 48

Multiple Choice

A modern version of Joule's experiment has you turn a crank attached to an 85.0 g aluminum cylinder. A belt exerts a frictional torque on the cylinder of 1.50 Nm. The specific heat of aluminum is 900 J/(kg·K) . How many turns of the crank are necessary to raise the temperature of the aluminum by 40 C°?

• A) 325
• B) 650
• C) 900
• D) 975
• E) 1300

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