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 24 rubs, at a distance of 8.50 cm per rub, and with an average frictional force of 44.0 N, what is the temperature increase? The mass of tissues warmed is only 0.100 kg, mostly in the palms and fingers.
Work done by the friction force = amount of thermal energy
transferred to the hand.
Work (W) = Ffriction x total distance
Here total distance = 24 x 8.5 cm = 204 cm = 2.04 m
or
Therefore, W = 44 x 2.04 = 89.76 N m
This is the amount of thermal energy which is transferred to the
tissue.
Now we can calculate the temperature increase by the following
formula as:
∆Q = mass x Specific heat x ∆T
Here we need to know the specific heat of the tissue. The average
specific heat of the human body is 3470 J/(kg * ˚C)
Therefore
∆T = 89.76 / (0.1 Kg x 3470 )
∆T = 0.26 ˚C
Rubbing your hands together warms them by converting work into thermal energy. If a woman rubs...
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 25 rubs a distance of 7.50 cm each and with a frictional force averaging 51.3 N, what is the temperature increase? The mass of tissue warmed is only 0.100 kg, mostly in the palms and fingers. The specific heat of the tissue is 3500 J/(kg · °C).
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 25 rubs a distance of 7.50 cm each and with a frictional force averaging 51.3 N, what is the temperature increase? The mass of tissue warmed is only 0.100 kg, mostly in the palms and fingers. The specific heat of the tissue is 3500 J/(kg · °C). ____C
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Even when shut down after a period of normal use, a large
commercial nuclear reactor produces heat at the rate of 162 MW by
the radioactive decay of fission products. This causes a rapid
increase in temperature if the cooling system fails.
Answers are NOT 12650 and 0.181 for #1.
Even when shut down after a period of normal use, a large commercial nuclear reactor produces heat at the rate of 162 MW by the radioactive decay of fission products....