You are watching: Rubbing your hands together is what type of energy

This is university Physics Answers with Shaun Dychko. A woman is rubbing her hands with each other 20 times and the inquiry is by just how much will she rise the temperature of she palms? We"re told the the massive of organization that"s walk to be heated is only around 0.10 kilograms. And, the distance of each obstacle is seven and a fifty percent centimeters. We transform that into meters. The friction force that she"s the contrary is 40 Netwons and also this distance of friction, pressure are needed since that"s going to be the work done on the hands. That job-related is walk to it is in turned into thermal energy. And also so, that"s walking to be the warmth transferred right into her palms. That"s walking to be the occupational done. So, we multiply the friction force by the total distance traveled, that"s why I have a subscript funding T there for total. Okay. We"ll gain there in a second. That"s additionally right down the details heat the the skin tissue, which to be a cup and also table 14.1, and also that is 3500 Joules every kilogram per Celsius degree. So, warm transfer is the mass of the organization times the particular heat times the adjust in temperature. And, we want to resolve for Delta T, and we"re going to divide both sides by M C and also then switch the sides roughly so we have actually the end one top top the left. So, we have Delta T is Q over M C. And also then, we understand that Q is going to be the job-related done top top the palms, i beg your pardon is the friction pressure times the complete distance rubbed. The full distance rubbed is going to be the number of times she rubs multiply by the distance per rub. And also so, we"ll substitute the in in place of D subscript T. So, us right funding N D here. All of this is going to be Q and our formula for Delta T. So, we substitute for Q now. So, the change in temperature climate is walk to be the friction pressure times the variety of rubs time the street per rub separated by the mass of tissue heated multiplied by the details heat of human being tissue. So, that"s 40 newtons times 20 rubs time 0.075 meters every rub, and also we separated that by 0.10 kilograms times 3500 Joules every kilograms per Celsius degree. And we acquire a adjust in temperature that 0.171 Celsius degrees.

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