SCIENCE <span title="HELP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!10">HELP!!!!!!!!!!!!!!!!!!!!!...</span> points for best answer?

Question

The nergy required to lift 2 skiers to the top of the mountain is 240,000J. the energy supplied to the motor is 800,000J. CALCULATE THE EFFICIENCY

i forgot the equation and please show how you did it.

Answer 1

240,000 / 800,000 = 30% efficient

and to the guy above me... you&#039;re saying the lift is 330% efficient?

Answer 2

The formula for Efficiency is Energy Output÷Energy Input ×100%. In the problem, the Energy Output is 240,000J while the Energy Input is 800,000J.

240,000J÷840,000J × 100% = 30%

30% is the efficiency.

Answer 3

The efficiency is (the motor joules) divided by (skiers joules).

Answer 4

Hey,

Efficiency = Useful Energy / Total Energy

So,

Efficiency of motor = 240,000/ 800,000 = 0.3 or 30% efficiency

Hope this helps :)