Find the final equilibrium temperature when 20.0 g of milk at 10.0°C is added to 160 g of coffee at 90.0°C. (Assume the specific heats of coffee and milk are the same as water and neglect the heat capacity of the container, and cwater = 1.00 cal/g•°C = 4186 J/kg•°C)
a. 85.3°C
c. 71.4°C
b. 81.1°C
d. 66.7°C
B
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Rotation curves for spiral galaxies show:
A) they are slowing down. B) rotation speed drops off further from the nucleus. C) most have dark halos. D) most of the mass lies in the nucleus. E) no relation to mass.
Star A has a temperature 1/4 that of star B. Both star A and star B are the same physical size. Which statement below is correct?
A) Star A is redder and dimmer than star B. B) Star A is bluer and dimmer than star B. C) Star A is redder and brighter than star B. D) Star A is bluer and brighter than star B. E) Star A and star B have the same color, but star A is brighter.
The size of a neutron star is
a. about the same as that of our Solar System. b. about the same as that of the Sun. c. about the same as Earth. d. smaller than any of these.
Directly above Earth's equator lies the ________ in the sky.
A. Celestial equator B. ecliptic C. North Celestial Pole D. South Celestial Pole