A 1500kg wrecking ball hangs from a 20m -long cable. The ball is pulled back until...
A 1500kg wrecking ball hangs from a 20m -long cable. The ball is pulled back until the cable makes an angle of 30.0? with the vertical.
By how much has the gravitational potential energy of the ball changed?
Homework Answers
delta U = m*g*h
= m*g*L*(1 - cos(30))
= 1500*9.8*20*(1 - cos(30))
= 39388.5 J
the height gain = 20 meters X sin30
PE = m g h
PE =1500 (9.8) x20sin30
EDIT
PE = 1500(9.8) x20 X 0.5
PE = 147000 Joules
chnge in gravitational potential energy = mgh
m = 1500kg
g = 9.8 m/s2
h = l -lcos 30 = 20(1-cos 30) =2.68m
change potential energy U = 1500x 9.8 x 2.68 =39396 J
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