An irregular galaxy contains mostly
a. lower-main sequence stars and giants.
b. upper main sequence stars and giants.
c. upper main sequence stars and gas and dust.
d. upper and lower main sequence stars and gas and dust.
e. white dwarfs and supergiants.
D
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Kinetic Energy: A 1.0-kg object moving in a certain direction has a kinetic energy of 2.0 J. It hits a wall and comes back with half its original speed. What is the kinetic energy of this object at this point?
A. 2.0 J B. 1.0 J C. 0.50 J D. 0.25 J E. 4.0 J
Neutron stars were first discovered in the 1930's
Indicate whether the statement is true or false
First Law of Thermodynamics: A fixed amount of an ideal monatomic gas is maintained at constant volume as it is cooled by 50 K. This feat is accomplished by removing 400 J of energy from the gas. How much work is done by the gas during this process?
A. 0 J B. 400 J C. -400 J D. -200 J E. 200 J
The greater the width of a resonance,
A) the greater the rest energy of the resonance. B) the greater the lifetime of the resonance. C) the lower the rest energy of the resonance. D) the shorter the lifetime of the resonance. E) None of the above answers are correct.