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Author Question: A modern version of Joule's experiment has you turn a crank attached to an 85.0 g aluminum cylinder. ... (Read 91 times)

jrubin

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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.


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nhea

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Reply #1 on: Jul 29, 2018
Answer to Question 1

A

Answer to Question 2

Answer: E


jrubin

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Reply 2 on: Jul 29, 2018
:D TYSM

Jsherida

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Reply 3 on: Yesterday
Excellent

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