At room temperature, a typical person loses energy to the surroundings at the rate of 62 W
If this energy loss has to be made up by an equivalent food intake, how many kilocalories (food calories) does this person need to consume every day just to make up this heat loss? (1 cal = 4.186 J)
A) 1300 kcal B) 1100 kcal C) 1600 kcal D) 1000 kcal E) 1500 kcal
A
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Conductor A has 16 electrons and conductor B has 32 electrons. The ratio of the valence electrons of conductor A and conductor B is given as
A) 1:2. B) 2:1. C) 1:3. D) 3:1. E) 3:2.
A capacitor with very large capacitance is in series with another capacitor with very small capacitance. What is the equivalent capacitance of the combination?
1.slightly greater than the capacitance of the large capacitor 2.slightly less than the capacitance of the large capacitor 3.slightly greater than the capacitance of the small capacitor 4.slightly less than the capacitance of the small capacitor
An explorer walks into a lab in a science building. She has a compass in her hand and finds that the south pole of her compass points toward the room's East wall when she is nearer that wall and toward the west wall when she is nearer that wall. You could explain this if magnetized metal had been installed in the East and West walls with North poles pointing into the room. If no magnetic material
was installed in the North or South walls of the room, she would expect that a. the south pole of the compass would tend to point toward those walls. b. the north pole of the compass would tend to point toward those walls. c. the compass needle would not point in any particular direction. d. the north pole of the compass needle would tend to point toward the centers of those walls, but the south pole would tend to point toward the sides of those walls. e. the south pole of the compass needle would tend to point toward the centers of those walls, but the north pole would tend to point toward the sides of those walls.
A cup of coffee is enclosed on all sides in an insulated container 1/2 cm thick in the shape of a cube 10 cm on a side. The temperature of the coffee is 95°C, and the temperature of the surroundings is 21°C. Find the rate of heat loss (in J/s) due to conduction if the thermal conductivity of the cup is 2 × 10^?4 cal/s/cm/°C
a. 62 b. 74 c. 230 d. 160 e. 12