Question

if you do 100 j in a pulley system increases the potential energy of a load by 60 j, what is the efficiency of the system?

Explanation:

Step1: Recall efficiency formula

Efficiency ($\eta$) of a system is given by the ratio of useful output energy to input energy, multiplied by 100%: $\eta = \frac{\text{Useful Output Energy}}{\text{Input Energy}} \times 100\%$

Step2: Identify values

Input energy = 100 J (assuming the first number is 100 J from the text), Useful output energy (increase in potential energy) = 60 J

Step3: Calculate efficiency

Substitute values into the formula: $\eta = \frac{60}{100} \times 100\% = 60\%$

Answer:

60% (corresponding to the option with 60%)