In a Joule experiment, a mass of 6.51 kg falls through a height of 66.8 m and rotates a paddle wheel that stirs 0.68 kg of water. The water is initially at 15 degrees C. By how much does its temperature rise (in degrees C)

Explanation:

As the given data is as follows.

         m = 6.51 kg,   g = 9.8 ,     h = 66.8 m

mass of water (M) = 0.68 kg,    Specific heat of water = 4200

According to the given situation, the decrease in potential energy of mass will be equal to heat energy gained by water.

Therefore,

                mgh =

        4261.7064 =

              1.492 = - 15

So,    

                       =

Therefore, we can conclude that rise in temperature will be .

real, smaller and upside-down.   so the answer should be b.