To find out how much energy Ronald put into the inclined plane, we can use the formula for efficiency, which is:
\[ \text{Efficiency} = \frac{\text{Useful work output}}{\text{Total energy input}} \]
In this case:
- Efficiency = 35% = 0.35
- Useful work output = 224 joules (based on what went into moving the box)
We can rearrange this formula to find the total energy input:
\[ \text{Total energy input} = \frac{\text{Useful work output}}{\text{Efficiency}} \]
Substituting in the known values:
\[ \text{Total energy input} = \frac{224 \text{ joules}}{0.35} \]
Calculating this gives:
\[ \text{Total energy input} = 640 \text{ joules} \]
Therefore, Ronald put 640 joules of energy into the inclined plane.
The correct response is 640 joules.
1 answer