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pharm89
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Homework Statement
Hi I am taking a self study physics course and not sure about the following question. Any help would be much appreciated. Thanks
1. A 15.0 g bullet is fired at 840 m/s into a ballistic pendulum consisting of a 24.0 kg bag of sand. If the bag rises to a height of 80.0 cm, how much energy is converted into thermal energy in the bag?
Homework Equations
The Attempt at a Solution
1. Given: m = 24.0 kg
h= 80 cm or 0.08 m
v= 840 m/s
Required: thermal energy
Analysis: Determine total mechanical energy as the bag of sand rises and falls.
Bag of sand at the top
mgh
(24.0 kg)(9.8 m/s^2)(0.08 m )
=18.81 J
At the bottom
Ek + Eg
1/2(24.0 kg ) (0.08m)
=0.96
Total mechanical energy = 18.81 J - 0.96 = 17.85 J
I am kind of lost with this question and not sure of the right procedure to follow.
Thanks for the assistance.