An electric drill transfers 200 J of energy into a useful kinetic energy store. It also transfers 44 J of energy by sound and 48 J of energy by heat. What is the efficiency of this drill? Round your answer to the nearest whole numbe
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Answer:
Given that,
Out put energy = 200 J
Transfer energy by sound= 44 J
Transfer energy by heat = 48 J
We need to calculate the efficiency of his drill
Using formula of efficiency
\eta=\dfrac{E_{out}}{E_{in}}\times100η=EinEout×100
Put the value into the formula
\eta=\dfrac{200-(44+48)}{200}\times100η=200200−(44+48)×100
\eta=54\%η=54%
Hence, The efficiency of his drill is 54 %.
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