When the Sun is located near one of the horizons, an observer looking at the sky directly overhead will view partially polarized light. This effect is due to which of the following processes?
a. reflection
b. double refraction
c. selective absorption
d. scattering
d
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In order to predict whether a star will eventually fuse oxygen into a heavier element, you mainly want to know what fact about the star?
A) how much oxygen it now has in its core B) its mass C) its luminosity D) its overall abundance of elements heavier than helium
You can reason that the time required for a ball to fall is related to the height from which it falls and to the acceleration due to gravity. Time is measured in seconds, height in meters, and gravitational acceleration. Using dimensional analysis, determine how the time to fall from height h compares to the time required to fall from height 2h.
A. It takes 1/2 as long
B. It takes 4 times as long
C. It takes 
times as long
D. It takes 2 times as long
E. It takes 
as long
F. It takes 1/4 as long
A laboratory vacuum pump can reduce the pressure in a chamber to 1.0 × 10-7 Pa
If the volume of the chamber is 0.500 m3 and the temperature is 27°C, how many molecules are left inside the chamber? (NA = 6.022 × 1023 molecules/mol, R = 8.31 J/mol ? K) A) 1.2 × 1013 B) 2.4 × 1013 C) 1.2 × 1012 D) 2.4 × 1012 E) 1.2 × 1014
2.00 moles of an ideal gas is at a pressure of 1.50 atmospheres and a volume of 0.00100 m3. What is the total kinetic energy of the gas?
A. 175 J B. 228 J C. 267 J D. 303 J E. 367 J