The engine weighs 4500 newtons and it is lifted 1.5 meters up by the block and tackle system. To accomplish this, the mechanic must apply a force of 225 newtons while pulling a total of 37.5 meters of chain through the block and tackle pulley system. What is the work done by the block and tackle system?
Force applied x distance = 225 x 37.5 = 8438 J
is the work done. Only 4500*1.5 = 6750 J is used raising the engine. The rest was used overcoming friction.
The block and tackle is not 100% efficient. The efficiency is 80%
6750
To calculate the work done by the block and tackle system, we need to use the formula:
Work = Force × Distance
In this case, the force applied by the mechanic is 225 newtons and the distance the chain is pulled through the block and tackle system is 37.5 meters.
So, the work done by the block and tackle system is:
Work = 225 newtons × 37.5 meters
= 8437.5 newton-meters (since force × distance = newton-meters)
Therefore, the work done by the block and tackle system is 8437.5 newton-meters.