Author Question: A modern version of Joule's experiment has you turn a crank attached to an 85.0 g aluminum cylinder. ... (Read 85 times)

jrubin · **on:** Jul 29, 2018

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/(kgK).

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

Question 2

The photons having greatest energy are those of

A) infrared.
B) red light.
C) green light.
D) blue light.
E) ultraviolet.