Question

You use an inclined plane to move furniture into a truck. You perform 352 kj of work, but only do 229 kj of useful work. What is the efficiency of the inclined plane?

Answer 1

Answer:

The efficiency of the inclined plane is 65.05%.

Explanation:

It is given that, you use an inclined plane to move furniture into a truck.

Work done performed by the person, i.e. input work $W_i=352\ kJ$

Useful work done by the person, i.e. input work $W_o=229\ kJ$

The efficiency of any simple machine is always less than 1. For the inclined plane it is given by :

$\eta=\dfrac{W_o}{W_i}\times 100$

$\eta=\dfrac{229\ kJ}{352\ kJ}\times 100$

$\eta=65.05\%$

So, the efficiency of the inclined plane is 65.05%. Hence, this is the required solution.

Answer 2

Answer: 65.05%

Explanation: using

efficiency = (useful work/work done)×100

= (229/352)×100

= 65.05%