In terms of the mass M of our sun, what is the Chandrasekhar limit of stellar mass, below which a star will eventually collapse into a white dwarf?
A) 1.9 M B) 1.4 M C) 1.2 M D) 0.8 M
B
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By how much will mercury rise (or fall) in a 1.0 mm diameter glass tube (contact angle 140.°, Hg density 13.6 g/cc, surface tension 0.45 N/m)?
What will be an ideal response?
What could happen in planetary systems where the nebular gas is quickly disbursed?
A) No terrestrial planets would form. B) The only planets would be more massive than Jupiter. C) Many planets would be destroyed by migration onto the central star. D) Large ice-rich planetesimals would not be able to gather hydrogen and helium and become gas giants.
At different times of the year, the Sun appears to be in different parts of the sky among different groups of stars. This is so because
a. Earth revolves about the Sun. b. the Sun rotates on its axis. c. the Sun moves through space. d. stars move. e. Earth rotates on its axis.
You are on an airplane traveling with a constant velocity at an altitude of 20,000 m. What is the acceleration of gravity at that altitude? The radius of Earth is 6.37 × 106 m
A) 9.81 m/s2 B) 9.78 m/s2 C) 9.75 m/s2 D) 9.72 m/s2 E) 9.69 m/s2