physics

You overindulged on a delicious dessert, so you plan to work off the extra calories at the gym. To accomplish this, you decide to do a series of arm raises holding a 5.5kg weight in one hand. The distance from your elbow to the weight is 36cm , and in each arm raise you start with your arm horizontal and pivot it until it is vertical. Assume that the weight of your arm is small enough compared with the weight you are lifting that you can ignore it. As is typical, your muscles are 20% in converting the food energy they use up into mechanical energy, with the rest going into heat.
If your dessert contained 360 food calories, how many arm raises must you do to work off these calories?

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asked by dia
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    posted by Anonymous

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