Under which circumstances can you be sure that the thermal pressure within a gas cloud is increasing?
A) The cloud's temperature and density are both increasing.
B) The cloud's temperature is increasing and its density is decreasing.
C) The cloud's temperature and density are both decreasing.
D) The cloud's temperature is decreasing and its density is increasing.
E) It is impossible to say.
B
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Based on our understanding of our own solar system, which of the following would be most surprising to observe in an extra solar system of planets?
A. Several planets have dense atmospheres containing carbon compounds. B. The planets nearest to the star have a lower density than the planets farther out. C. All the gas giants have moons. D. Several planets show large tilts of their rotation axis compared to the plane of their orbits.
Consider a radioactive substance with a half-life of 10 years. If you start with 1 kilogram of this substance, after 20 years, ________ of the radioactive substance will remain.
A) 0.25 kilogram B) none C) 0.75 kilogram D) 0.5 kilogram
A 2.0-kg block slides on a frictionless 25° inclined plane. A force of 4.6 N acting parallel to the incline and up the incline is applied to the block. What is the acceleration of the block?
a. 1.8 m/s2 up the incline b. 2.3 m/s2 up the incline c. 6.6 m/s2 down the incline d. 1.8 m/s2 down the incline e. 2.3 m/s2 down the incline
If in a double-slit experiment the distance to the screen is increased, which of the following happens to the interference pattern shown on the screen?
A) The minima get closer together. B) The maxima stay at the same position. C) The minima and maxima stay at the same position. D) The maxima get further apart. E) The minima stay at the same position.