All the following types of objects are found almost exclusively in the disk (rather than the halo) of the Milky Way except
A) young stars.
B) globular clusters.
C) X-ray binaries.
D) high-mass, red supergiant stars.
B
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A rocket is launched from the origin with an acceleration of 20.0 
at an angle of 30.0 degrees above the horizontal. The launch acceleration lasts for 2.00 seconds at which time the fuel is exhausted. The rocket then falls with an acceleration of 9.80 
downward. What is the time it takes to reach maximum height?
A. 3.22 s B. 3.87 s C. 6.08 s D. 4.75 s E. 5.12 s
Mort's twin, Velma, flies to a distant star at high speed and returns to Mort on Earth. She then finds that
A) she is younger than Mort. B) they are the same age. C) Mort is younger than her. D) they are both younger than each other. E) she has been changed into a giraffe.
A resistor and an inductor are connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the current to decrease to
A) 25% of the original value. B) 37% of the original value. C) 50% of the original value. D) 63% of the original value. E) 75% of the original value.
What is the net power that a person with surface area of 1.20 m2 radiates if his emissivity is 0.895, his skin temperature is 27°C, and he is in a room that is at a temperature of 17°C? (? = 5.67 × 10-8 W/m2 ? K4)
A) 60.3 W B) 62.6 W C) 65.7 W D) 68.4 W E) 64.8 W