Work Power and Energy 3 Question 9

9. A body of mass 2kg is being dragged with a uniform velocity of 2m/s on a rough horizontal plane. The coefficient of friction between the body and the surface is 0.20,J=4.2J/cal and g=9.8m/s2. Calculate the amount of heat generated in 5s.

(1980,5M)

Show Answer

Answer:

Correct Answer: 9. 9.33cal

Solution:

  1. s=vt=2×5=10m

Q= work done against friction

=μmgs=0.2×2×9.8×10=39.2J=9.33cal

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