The orbits of population I stars I. are confined to disk of the galaxy. II. are very elliptical. III. are nearly circular. IV. are randomly inclined to the disk of the galaxy

a. I
b. IV
c. I & IV
d. II & IV
e. I & III


e

Physics & Space Science

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A large gas cloud in the interstellar medium that contains several type O and B stars would appear to us as:

A) a dark nebula. B) an emission nebula. C) bright blue. D) a reflection nebula. E) a dark patch against a bright background.

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Sun is considered to be a

A) low-mass star. B) intermediate-mass star. C) high-mass star. D) brown dwarf.

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Two identical cars are traveling around the same curve on a highway. One of them is moving at 60 mph, and the other is moving at 30 mph. The centripetal force acting on the car moving at 60 mph is __________ the value of the centripetal force acting on the car moving at 30 mph

a. one quarter b. one half c. the same as d. twice e. four times

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An ideal gas with ? = 1.67 is initially at 0°C in a volume of 10.0 liters at a pressure of 1.00 atm. It is expanded adiabatically to a volume of 10.4 liters. What then is the temperature?

A) -7.10°C B) 2.53°C C) -22.7°C D) 67.8°C E) -19.5°C

Physics & Space Science