Hydrostatic equilibrium in our Sun is the balance between:
A) convection and radiation.
B) convection and gravitation.
C) pressure and radiation.
D) radiation and gravitation.
E) gravitation and pressure.
E
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How many times must a dip in the brightness of a star be seen in order to detect a planet with the transit technique?
A) 1 time B) 2 times C) 3 times D) 4 times
How would you expect a star that formed recently in the disk of the galaxy to differ from one that formed early in the history of the disk?
A) It should have a higher fraction of elements heavier than hydrogen and helium. B) It should be much brighter. C) It should be higher in mass. D) It should orbit the galactic center at a much higher rate of speed. E) All of the above would be expected.
The melting point of aluminum is 660°C, its latent heat of fusion is 4.00 × 105 J/kg, and its specific heat is 900J/kg ? K. How much thermal energy must be added to 500 g of aluminum originally at 27°C to completely melt it?
A) 485 kJ B) 395 kJ C) 273 kJ D) 147 kJ E) 14 kJ
Which of the following is true about simultaneous events?
a. Whether two events are simultaneous depends on the reference system the events are viewed from. b. Two events at different places cannot ever be simultaneous. c. Two events can only be simultaneous if they happen at the same place. d. Two events can only be simultaneous if they are very carefully timed. e. Only one event can be simultaneous at a time.