A star of spectral type B with a mass of 10 times the mass of the Sun lives approximately how long on the main sequence?
A) 10 billion years
B) 10 million years
C) 1,000 years
D) 10,000 years
E) 1 billion years
B
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Rain or snow that falls on the continents is Earth's only
A) supply of water. B) supply of fresh water. C) hydrologic cycle. D) source of evaporation and condensation.
A sealed 89- tank is filled with 6000 moles of oxygen gas (O2) at an initial temperature of 270 K
The gas is heated to a final temperature of 350 K. The ATOMIC mass of oxygen is 16.0 g/mol, and the ideal gas constant is R = 8.314 J/mol · K = 0.0821 L · atm/mol · K. The initial pressure of the gas is closest to A) 0.15 MPa. B) 0.17 MPa. C) 0.19 MPa. D) 0.13 MPa. E) 0.11 MPa.
What is the charge on 1.0 kg of protons? (e = 1.60 × 10-19 C, mproton = 1.67 × 10-27 kg)
A) 1.0 C B) 1000 C C) 9.6 × 107 C D) 6.0 × 1026 C E) 6.0 × 1023 C
Brewster's Angle: When unpolarized light from air (with refractive index 1.00) strikes a piece of glass with index of refraction 1.80, the reflected light is found to be completely polarized when the angle of incidence is equal to Brewster's angle. What is the angle of refraction in this case?
Fill in the blank(s) with the appropriate word(s).