What is the typical main sequence lifetime of a B-type star?
A) less than a million years
B) 20 million years
C) 100 million years
D) 1 billion years
E) 10 billion years
B
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Collisions between galaxies tend to destroy, not create, stars
Indicate whether the statement is true or false
Suppose that a rigid aluminum wire were to be strung out in a loop that just fits snugly around the equator (assuming a perfectly spherical Earth with a radius of 6.37 × 106 m)
If the temperature of the wire is increased by 0.50°C, and the increase in length is distributed equally over the entire length, how far off the ground will the wire loop be if it remained centered on the earth? The coefficient of linear expansion of aluminum is 24 × 10-6 K-1. A) 76 cm B) 760 m C) 76 mm D) 7.6 mm E) 76 m
What is the nuclear radius of 90Sr?
A) 4.0 × 10-15 m B) 1.2 × 10-15 m C) 1.1 × 10-13 m D) 5.4 × 10-15 m E) 3.3 × 10-13 m
Which of the following applies to Triton?
A) It is the most volcanically active body in the solar system. B) It is thought to have a deep, subsurface ocean of liquid water. C) It is the only moon in our solar system with an atmosphere thicker than Earth's atmosphere. D) It is the largest moon in the solar system. E) It is probably a captured Kuiper belt object.