Consider the apparatus that Joule used in his experiments on the mechanical equi

Question

Consider the apparatus that Joule used in his experiments on the mechanical equivalent of heat, shown in the figure below. Suppose both blocks have a mass of 0.87 kg and that they fall through a distance of 0.40 m. (a) Find the expected rise in temperature of the water given that 6200 J are needed for every 1.0 degree C increase. Give your answer in Celsius degrees. (b) Would the temperature rise in Fahrenheit degrees be greater than or less than that of Celsius? (c) Find the rise in temperature in Fahrenheit degrees.

Explanation / Answer

The PE of the blocks = 2(mgh)

PE = 2(.87)(9.8)(.4)

PE = 68.2 J

1/6200 = x/68.2

x = .011 oC

Part B)

Fahrenheit

Part C)

To convert to a Fahrenheit change, multiply by 9/5

(.011)(9/5)

That is a .0198 oF change

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