Compared to its average speed in air, the average speed of a beam of light in glass is
A) more.
B) less.
C) the same.
Answer: B
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A proton of mass m is at rest when it is suddenly struck head-on by an alpha particle (which consists of 2 protons and 2 neutrons) moving at speed v
If the collision is perfectly elastic, what speed will the alpha particle have after the collision? (Assume the neutron's mass is equal to the proton's mass.) A) zero B) 2v/3 C) 3v/5 D) 5v/3
The Milky Way galaxy is an example of a grand-design galaxy
a. True b. False Indicate whether the statement is true or false
Most of the mass in the Milky Way Galaxy is located
A) in the halo (above/below the disk). B) within the disk. C) in the stars in the spiral arms. D) in the gas and dust. E) in the central bulge of the galaxy.
Which of the following are the jovian planets?
a) Jupiter, Saturn, Uranus, Neptune b) Earth, Mars, Jupiter, Saturn c) Uranus, Neptune, and Pluto d) Mercury, Jupiter, and Saturn e) Mercury, Venus, Earth, Mars