Power
work done
time required
P
1.5 x 108 ft lbf
100 min
1 min
60 sec
1 hp
550 ft lbf/sec
P
45.5 hp
P
Fv
550
P
(1 lbf) (5 ft/sec)
550
P
9 x 103 hp
POWER
Energy, Work, and Power
CP-05
Page 10
Rev. 0
Example 1:
A pump provides a flow rate of 10,000 gpm. The pump does 1.5 x 10 ft-lbf of work
8
every 100 minutes. What is the power of the pump in hp?
Example 2:
A boy rolls a ball with a steady force of 1 lbf, giving the ball a constant velocity of 5
ft/s. What is the power used by the boy in rolling the ball?
