Problem 1020 roblem 1020 Part A A 1500 kg wrecking ball hang

Problem 10.20 roblem 10.20 Part A A 1500 kg wrecking ball hangs from a 20-n-long cable. The ball is pulled back until the cable makes an angle of 25.0 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 U = 1 Value Units Submit Provide Feedback

Solution

Given,

mass(m) = 1500 kg

h = 20 m

angle(theta)= 25 degrees

A)
change in height = 20 - 20*cos(theta)
   = 20 - 20*cos25

                          = 1.874 m

potential energy = mass*g* change in height
= 1500*(9.8)*(1.874)

                           = 27,547.8 J
= 27.5478 kJ