- #1
UrbanXrisis
- 1,196
- 1
If a certain horse can maintain 1.00hp of output for 2 hrs, how many 70 kg bundles of shingles can the horse hoist to the roof of a house 8 m tall, assuming 70% efficiency?
He're what I did: 1 hp = 745.7 W = 44742 J/min = 2684520 J/hr = 5369040 J/ 2 hr * 70% = 3758328 J / 2 hr
W=Fd
W=(70*9.8)(8m)
W=5488 J
3758328 J / 5488 J =684.8 bundles of shingles
is this correct?
He're what I did: 1 hp = 745.7 W = 44742 J/min = 2684520 J/hr = 5369040 J/ 2 hr * 70% = 3758328 J / 2 hr
W=Fd
W=(70*9.8)(8m)
W=5488 J
3758328 J / 5488 J =684.8 bundles of shingles
is this correct?