A person is walking outdoors on a cold day when the temperature is -20°C. Each time he breathes, he inhales 0.0050 m3 of air
He is breathing at the rate of 16 breaths per minute. At what rate does he lose heat from breathing if the air in his lungs is heated to body temperature (37°C) before it is exhaled? The specific heat of air is 1020 J/(kg?K) and the density of air is 1.29 kg/m3.
A) 60 W
B) 90 W
C) 100 W
D) 150 W
E) 300 W
C
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Which of the following is true of Population I stars?
A) They are usually found in the halo of our Galaxy. B) They are usually found in globular clusters. C) They are usually found in the central bulge. D) They are usually found in the disk component of the galaxy.
A baseball (0.145 kg, circumference 229 mm) is held completely under sea water (density, 1017 
by the application of what force?
A. 0.21 N B. 0.49 N C. It requires no additional force to remain completely submerged. D. 0.061 N E. 0.145 N
Two bulbs are shown in a circuit that surrounds a region of increasing magnetic field directed out of the page. When the switch is closed,
a.
bulb 1 glows more brightly.
b.
bulb 2 glows more brightly.
c.
both bulbs glow equally brightly.
d.
bulb 1 goes out.
e.
bulb 2 goes out.
If the potential in a region is given by V(x,y,z) = xy - 3z-2, then the y component of the electric field in that region is
A) x + y - 6z-3. B) -y. C) -x. D) x + y.