a) How much power,( answer given in both watts and HP ), must you exert horizont
ID: 2259516 • Letter: A
Question
a) How much power,( answer given in both watts and HP ), must you exert horizontally to drag a 25kg table, 10m across a brick floor in 30s at a constant speed if the coefficient of kinetic friction is 0.550 ?
b) If the table were accelerated by 0.5m/s^2 while being dragged, what would be the maximum HP needed?
How much power,( answer given in both watts and HP ), must you exert horizontally to drag a 25kg table, 10m across a brick floor in 30s at a constant speed if the coefficient of kinetic friction is 0.550 ? If the table were accelerated by 0.5m/s^2 while being dragged, what would be the maximum HP needed?Explanation / Answer
a). Force applied = friction force = u*N = 0.55*25*9.8 = 134.75 N work done = F*s = 134.75* 10 = 1347.5 J power = work/time = 1347.5/30 = 44.917 W = 44.917/746 hp = 0.0602 hp b). net force = m*a => F - 0.55*25*9.8 = 25*0.5 => F = 147.25 N work done = F*s = 147.25*10 = 1472.5 J power = work/time = 1472.5/30 = 49.083 W = 49.083/746 hp = 0.0658 hp
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