Question

Rubbing your hands together warms them by converting work into thermal energy. If a woman rubs her hands back and forth for a total of 20 rubs, at a distance of 7.50 cm per rub, and with an average frictional force of 40.0 N, what is the temperature increase? The mass of tissues warmed is only 0.100 kg, mostly in the palms and fingers.

They use the formula Q=NFd

I do not understand this formula or its derivation. It is not available on the internet or anywhere in my texbook.

Can u explain this please.

Thank You

Answer 1

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