Question

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 driving the nail in to the wood is 8.0 J. What is the efficiency of the construction worker's hammering?

Answer 1

Answer:-

• Used Energy=8J=P
• Initial energy=20J=V

We know that

$\boxed{\sf Efficency=\dfrac{P}{V}}$

$\\ \qquad\quad\sf{:}\longrightarrow Efficency=\dfrac{8}{20}$

$\\ \qquad\quad\sf{:}\longrightarrow Efficency=0.4J$