A mole of diatomic oxygen molecules and a mole of diatomic nitrogen molecules are at STP. Which statements are true about these molecules? (There could be more than one correct choice.)
A) Both gases have the same average molecular speeds.
B) Both gases have the same number of molecules.
C) Both gases have the same average kinetic energy per molecule.
D) Both gases have the same average momentum per molecule.
B, C
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Which of the following objects cannot transit (i.e. pass in front of) the Sun as seen from Jupiter?
a. Mars b. Earth c. Saturn d. Mercury e. Venus
The big bang is thought to have occurred about
A) 14 trillion years ago. B) 14 million years ago. C) 5000 years ago. D) a million years ago. E) 14 billion years ago.
Planet Zero has a mass of 4.0 × 10^23 kg and a radius of 2.0 × 10^6 m. A 10-kg space probe is launched vertically from the surface of Zero with an initial kinetic energy of 8.0 × 10^7 J. What maximum distance from the center of Zero is achieved by the probe?
a. 3.2 × 10^6 m b. 4.0 × 10^6 m c. 6.0 × 10^6 m d. 5.0 × 10^6 m e. 2.5 × 10^6 m
The meaning of the phrase "space is relative" is that
A) all observers measure the same speed for a lightbeam. B) two observers, both in the same reference frame, observe different lengths for different objects. C) two observers, in different reference frames, observe different lengths for different objects. D) two observers, in different reference frames, observe different lengths for the same object. E) two observers, both in the same reference frame, observe different lengths for the same object.