Question: Based on the scenario below think about different changes in energy. Do the estimates posted seem reasonable? are there other ways you might estimate the

Based on the scenario below think about different changes in energy. Do the estimates posted seem reasonable? are there other ways you might estimate the energy introduced into the system?

When I pick up the 25 pound (11.33 kg) dumbbell off the rack, I hold it at my side. According to my handy tape measure, when my arm is straight by my side, my hand is 30 inches (0.762 m) above the ground.

PE = mass * gravitational force * height

PE = (11.33)(9.8)(0.762)

PE = 84.61 J

Similarly, when I am laying flat on the bench, I am holding the barbell straight above my chest. Let's say it weights 135 pounds (61.235 kg), and with my arms fully extended it is 25 inches above my body (0.635 m).

PE = (61.235)(9.8)(0.635)

PE = 381.06 J

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