Question

How much time does t take a machine with 1200 w power rating to do 42000 j of work?

Answer 1

Given data:

The power of a machine is

`P=1200\text{ W}`

The work done by the machine is

`W=42000\text{ J}`

Now, the formula of the power of a machine can be expressed as,

`P=(W)/(t)`

Substituting the values in the above equation, we get:

`\begin{gathered} 1200\text{ W=}\frac{42000\text{ J}}{t} \\ t=\frac{42000\text{ J}}{1200\text{ W}}(\frac{1\text{ s}}{1\text{ J/W}}) \\ =35\text{ s} \end{gathered}`

Thus, the time taken by the machine is 35 s.