Consider the apparatus that Joule used in his experiments on the mechanical equi
ID: 2250573 • Letter: C
Question
Consider the apparatus that Joule used in his experiments on the mechanical equivalent of heat, shown in Figure 16-8. Suppose the block has a mass of 0.75 kg and that it falls through a distance of 0.45 m. Find the expected rise in temperature of the water given that 6200 J are needed for every 1.0
Consider the apparatus that Joule used in his experiments on the mechanical equivalent of heat, shown in Figure 16-8. Suppose the block has a mass of 0.75 kg and that it falls through a distance of 0.45 m. Find the expected rise in temperature of the water given that 6200 J are needed for every 1.0 degree C increase.Explanation / Answer
mass of block m = 0.75 kg
the block falls a distance of h = 0.45 m
the potential energy of the block is
U = m x g x h
where g = 9.8 m/s^2
for 6200 J the temperature is 1.0 oC
for U J the temperature is T
or 6200 x T = U x 1
or T = (U/6200) = (m x g x h/6200) oC