Define the rate of doing work? Find an expression? Also give unit?
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Rate of doing work is called power.
In other words, power is defined as the work done in unit time.
Expression: P = W/∆T,
where P is the power, W is the work done, ∆T is the time period.
If the work done is a function of time, then we can use differentiation to calculate power
if W = f(t), then
Power = dW/dt = d f(t)/dt
Unit of Power : joules/sec or watts
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