Question

a washing machine takes 1200 j total, but it only uses 840 j to function. what is the efficiency of the washing machine? ? % hint : efficiency = \frac{usable e}{total e} \cdot 100

Explanation:

Step1: Identify usable and total energy

Usable energy ($\text{usable E}$) = 840 J, Total energy ($\text{total E}$) = 1200 J.

Step2: Apply efficiency formula

Using the formula $\text{Efficiency} = \frac{\text{usable E}}{\text{total E}} \cdot 100$, substitute the values:
$\text{Efficiency} = \frac{840}{1200} \cdot 100$

Step3: Calculate the fraction and multiply by 100

First, simplify $\frac{840}{1200} = 0.7$. Then multiply by 100: $0.7 \cdot 100 = 70$.

Answer:

70