Answered

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A 20N box is pushed 10m up a ramp in 25 seconds. How much power is required? The work out to lift the same box is 75 J. Calculate the efficiency

Sagot :

To now the power we need to:

[tex]P=\frac{E}{t}=\frac{F\cdot d}{t}=\frac{20N\cdot10m}{25s}=8W[/tex]

The power is the ratio of energy over time, and the energy is the force applyed in the distance

For the efficiency

[tex]\eta=\frac{75J}{20N\cdot10m}=0.375[/tex]

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