60) A brick weighing 40 kg is dropped into
a com deep river from a height of 2.0m
Assuming that 80% of the gravitational
Po thential energy is finally converted into
thermal energy find this thermal Energy
in calorie
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Answer:
Given:
Mass of the brick, m = 4 kg
Total vertical distance travelled by the brick, h = 3 m
Percentage of gravitational potential energy converted to thermal energy = 80
Total change in potential energy of the brick = mgh = 4 × 10 × 3 = 120 J
Thermal Energy = 120×80100= 96 J
Thermal energy in calories is given by
U=964.2=22.857 cal ≈23 cal
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