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3 years ago

8

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

g the nail into the wood is 8.0 J. What is the efficiency of the construction worker's hammering? (2 sig figs and answer in a percentage)

1 answer:

maks197457 [2]3 years ago

3 0

Answer:

The efficiency of the constuction is 9.0

Explanation:

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A cosmic ray proton moving toward the Earth at 5.00 10 m/s 7 × experiences a magnetic force of 1.70 10 N −16 × . What is the str

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