You do 100 J of work in pulling out a nail with a claw hammer. If the hammer does 70 J of work, what is the hammer's efficiency?
Eff. = 70/100 * 100%.
Eff. is 70/100
To determine the efficiency of the hammer, we can use the formula:
Efficiency = (Work output / Work input) x 100%
Given that the work output of the hammer is 70 J and the work input (total work done) is 100 J, we can substitute these values into the formula:
Efficiency = (70 J / 100 J) x 100%
Simplifying the equation:
Efficiency = 0.7 x 100%
Efficiency = 70%
Therefore, the hammer's efficiency is 70%.
To find the hammer's efficiency, we need to calculate the ratio of the work output to the work input, and then express it as a percentage.
First, we need to determine the work done by the hammer, which is given as 70 J (work output).
Second, we are given the total work done in pulling out the nail, which is 100 J (work input).
Efficiency can be calculated using the formula:
Efficiency = (Work output / Work input) * 100%
Plugging in the values we know:
Efficiency = (70 J / 100 J) * 100%
Simplifying the equation:
Efficiency = 0.7 * 100%
Efficiency = 70%
Therefore, the hammer's efficiency is 70%.