student lifts a 50.0 pound (lb) ball 4.00 feet (ft) in 5 .00seconds (s). How many watts of power are used to lift the ball?
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Answered by
13
Converting tho SI Units:
Mass m = 50 pound = 22.5 kg
Time t = 5 s
Displacement s = 4 ft = 1.2 m
Acceleration due to gravity = 10 m s⁻¹
Power P = Work done / time = (m X a X s) / t
= (22.5 X 10 X 1.2) / 5 = 270 / 5
= 54 W (watt)
Hope this helps you. :)
Mass m = 50 pound = 22.5 kg
Time t = 5 s
Displacement s = 4 ft = 1.2 m
Acceleration due to gravity = 10 m s⁻¹
Power P = Work done / time = (m X a X s) / t
= (22.5 X 10 X 1.2) / 5 = 270 / 5
= 54 W (watt)
Hope this helps you. :)
rina2112:
thank you
You're welcome :)
:-)
Answered by
7
Given:
mass of ball =50 pound =50x4.45 =225.5N[ ∵1Ib=4.45N]
height=4 feet=4X0.305=1.22m[∵1 ft=0.305m]
time=5 seconds
Work done= Force x Displacement
W= 225.5x 1.22= 275.11
Power=Work/time
=275.11/5
=55.0 W
so 55 watts of power is required to lift the ball.
mass of ball =50 pound =50x4.45 =225.5N[ ∵1Ib=4.45N]
height=4 feet=4X0.305=1.22m[∵1 ft=0.305m]
time=5 seconds
Work done= Force x Displacement
W= 225.5x 1.22= 275.11
Power=Work/time
=275.11/5
=55.0 W
so 55 watts of power is required to lift the ball.
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