the janitor exerted 80 newtons of forse to push the meter-long hall against the forse of friction. then he lifted the box weighing 220 newtons onto the second shelf, which was 1 meter off the floor. How much work did the janitor do?
work = force x distance
To determine the work done by the janitor, we need to calculate the work done in two separate tasks: pushing the meter-long hall against the force of friction and lifting the box onto the second shelf.
1. Work done in pushing the meter-long hall:
Work is calculated using the formula: Work = Force × Distance
Given that the janitor exerted a force of 80 Newtons and pushed the hall (assuming there is no friction on the hall) for a distance of 1 meter, we can calculate the work done as follows:
Work = 80 N × 1 m
Work = 80 Joules (J)
2. Work done in lifting the box:
Work is also calculated using the formula: Work = Force × Distance
Given that the box weighed 220 Newtons and was lifted to a height of 1 meter, we can calculate the work done as follows:
Work = 220 N × 1 m
Work = 220 Joules (J)
Thus, the total work done by the janitor is the sum of the work done in pushing the hall and lifting the box:
Total Work = Work done in pushing + Work done in lifting
Total Work = 80 J + 220 J
Total Work = 300 Joules (J)
Therefore, the janitor did a total of 300 Joules of work.