Approximately how long does it take the Sun to orbit the Milky Way Galaxy?
A) 23,000 years
B) 230,000 years
C) 2.3 million years
D) 230 million years
E) 23 billion years
D
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The sum of the baryonic and non-baryonic matter is 27.9% and thus equal to the critical density
a. True b. False Indicate whether the statement is true or false
The power expended doing 100 J of work in 50 s is
A) 1/2 W. B) 2 W. C) 4 W. D) 50 W. E) 5,000 W.
A force of 1 N accelerates a 1-kg mass at 1 m/s2. The acceleration of a 2-kg mass acted upon by a force of 2 N is
A) half as much. B) twice as much. C) the same. D) none of the above
What is the average kinetic energy per molecule of an ideal gas at a temperature of 300 K? Boltzmann's constant is k = 1.38 × 10-23 J/K
A) 1.7 × 10-21 J B) 8.3 × 10-21 J C) 6.2 × 10-21 J D) 2.1 × 10-21 J E) 4.1 × 10-21 J