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yurimontoya759
25.10.2019 •
Physics
A50-kg sack is lifted a vertical distance of 2 m another 25-kg sack is lifted a vertical distance of 4 m. if both sacks are lifted their respective distances in the same time, how does the power required for each compare? how about for the case in which the lighter sack is moved the same distance in half the time?
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Ответ:
Part a)
Here in both cases we will have same power
Part b)
Again we have same power in above two cases
Explanation:
Part a)
As we know that power is defined as the work done per unit time
now we know that both the sack is pulled upwards in same time
so we will have
so we will have
so here in both cases we will have same power
Part b)
now lighter sack will move same distance in half time
so we will have
so again we have same power in above two cases
Ответ:
hi, of course i want to talk
Explanation:
sometime we need to talk too while still doing h/w