Question

​a metal block of mass 10 kg is dragged on a rough horizontal surface with a constant speed of 5 ms−1. If the coefficient of kinetic friction between the block and the road is 0.4, then the rate of generation of heat in s.I unit is

Answer 1

200 .........................................................................................

Answer 2

Hello friend,

◆ Answer -

dW/dt = 200 J/s

◆ Explaination-

# Given-

m = 10 kg

v = 5 m/s

μ = 0.4

# Solution-

Frictional force is calculated by-

F = μN = μmg

F = 0.4 × 10 × 10

F = 40 N

Rate of generation of heat is calculated by-

dW/dt = d(F.s)/dt

dW/dt = F.ds/dt

dW/dt = F.v

dW/dt = 40 × 5

dW/dt = 200 J/s

Therefore, rate of generation of heat is 200 J/s.

Hope this helps...