Why does the density of water vary with temperature?
A brief answer the student might give is that the density of water is a function of the
mass of the water molecules and the spacing between them. The spacing is a function
of temperature and becomes a minimum at 3.8°C.
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Compared with the spectral lines in the solar spectrum, lines in a supergiant star's spectrum are
a. more narrow. b. broader. c. weaker. d. stronger. e. broader and weaker.
A quantity of monatomic ideal gas expands adiabatically from a volume of 2.5 liters to 6.3 liters. If the initial pressure is P0, what is the final pressure?
a. 2.5P0 b. 4.7P0 c. 5.0P0 d. 0.21P0 e. 0.43P0
A rocket with an initial mass of 1000 kg adjusts its thrust by varying the rate at which mass is ejected. The ejection speed relative to the rocket is 40 km/s. If the acceleration of the rocket is to have a magnitude of 20 m/s2 at an instant when its mass is 80% of the original mass, at what rate is mass being ejected at that instant? Ignore any external forces on the rocket
a. 0.40 kg/s b. 0.50 kg/s c. 0.60 kg/s d. 0.70 kg/s e. 0.80 kg/s
Other planetary systems are best detected by the Doppler shifts that change the pattern of the star's
a. spectrum. b. brightness. c. rotational period. d. twinkling.