A fixed container holds oxygen and helium gases at the same temperature. Which of the following statements are correct? (There could be more than one correct choice.)
A) The oxygen molecules have the greater speed.
B) The helium molecules have the same average kinetic as the oxygen molecules.
C) The helium molecules have the greater speed.
D) The helium molecules have the greater average kinetic energy.
E) The oxygen molecules have the greater average kinetic energy.
B, C
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Can we see the "intruder galaxy" in the image?
A: Yes. B: No.
The figure shows an LR circuit with a switch and a 240-volt battery. At the instant the switch is closed the current in the circuit and the potential difference between points a and b, Vab, are
a.
0 A, 0 V
b.
0 A, ?240 V
c.
0 A, +240 V
d.
0.024 A, 0 V
e.
0.024 A, +240 V
This figure shows the life track of a 1 solar-mass star from its beginnings in a collapsing cloud fragment until it becomes a main-sequence star. At which of the numbered points is the object generating energy primarily from gravitational contraction?
A) Points 1, 2, and 3 B) Point 1 only C) Point 2 only D) Point 3 only E) Point 4 only F) Points 1 and 2 only
Compared with the huge force that attracts an iron tack to a strong magnet, the force that the tack exerts on the magnet is
A) relatively small. B) equally huge. C) not enough information