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7nadin3 [17]
2 years ago
15

A construction worker puts 20J of energy in to one strike of his hammer on the head of a nail. The energy transferred to driving

d nail in to d wood is 8J. What is d efficiency of d construction worker's hammering?​
Physics
2 answers:
KengaRu [80]2 years ago
4 0

Answer:

The efficiency can be found using the formula ;

efficiency=energy output divided by energy input ×100%.

efficiency=8.0j÷ 20j × 100%

efficiency=0.4 ×100%

efficiency=40%.

the efficiency of the hammer strike was 40%. vibration and heating of the nail are two possible reasons for the energy loss.

Slav-nsk [51]2 years ago
3 0

Answer:

efficiancy=40 percent

Explanation:

efficiency=energy output/energy input×100

efficiancy=8J/20J×100

efficiancy=0.4×100

efficiancy=40 percent

Mark brianliest if my answer suit your question..

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3 years ago
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Answer:

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Explanation:

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According to the equation, when V is directly proportional to 'I' where 'R' remains as constant, then the change in 'V is brings change in 'I' to make the equation valid.

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