The corona of the sun can be observed
a. during a lunar eclipse.
b. with a coronagraph.
c. using filtergrams.
d. a and b above
e. none of the above
B
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What do astronomers think is the eventual fate of a white dwarf?
What will be an ideal response?
A 0.30 kg mass is suspended on a string. In equilibrium the mass stretches the spring 2.0 cm downward. The mass is then pulled an additional distance of 1.0 cm down and released from rest
(a) Write down its equation of motion. (b) Calculate the velocity of the mass at T/3 s.
What is the magnitude of the free-fall acceleration at a point that is a distance 2R above the surface of the Earth, where R is the radius of the Earth?
a. 4.8 m/s2 b. 1.1 m/s2 c. 3.3 m/s2 d. 2.5 m/s2 e. 6.5 m/s2
Which of the following rocks would be expected to have the coarsest-grained texture?
a) granite b) obsidian c) basalt d) pumice