A 1200 kg wrecking ball hangs from a 20-m-long cable. The ball is pulled back un

Question

A 1200 kg wrecking ball hangs from a 20-m-long cable. The ball is pulled back until the cable makes an angle of 16.0 with the vertical.

Problem 10.20 Part A A 1200 kg wrecking ball hangs from a 20-m-long cable. The ball is pulled back until the cable makes an angle of 16.0° with the vertical. By how much has the gravitational potential energy of the ball changed? Express your answer to two significant figures and include the appropriate units. ? AU alue Submit My Answers Give Up Incorrect; Try Again; 3 attempts remaining Continue

Explanation / Answer

The ball has raised by the distance

h = 20 - 20cos16

h = 0.7747 m

PE = mgh

PE = 1200(9.81)(0.7747)

PE = 9120.546 J = 9.12 kJ

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