Chapter SH, Problem 4.5APP

To determine

To Calculate: Efficiency of a machine.

Answer to Problem 4.5APP

Efficiency of the machine is $\underset{\_}{25\%}$ .

Explanation of Solution

Given:

Input work = $1200\text{ J}$

Output work = $300\text{ J}$

Formula used:

Efficiency is given by,

  $e=\frac{W_{\text{out}}}{W_{\text{in}}}\times 100$

where $W_{\text{out}}$ is output work and $W_{\text{in}}$ is input work.

Calculation:

Efficiency is calculated as:

  $\begin{array}{l}e=\frac{W_{\text{out}}}{W_{\text{in}}}\times 100\\ e=\frac{300\text{ J}}{1200\text{ J}}\times 100\\ e=25\%\end{array}$

Conclusion:

Efficiency of the machine is $\underset{\_}{25\%}$ .