A ball tossed vertically upward rises, reaches its highest point, and then falls back to its starting point. During this time the acceleration of the ball is always
A) in the direction of motion.
B) opposite its velocity.
C) directed upward.
D) directed downward.
E) none of the above
Answer: D
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The light blue ellipse represents tidal bulges. In what way are these bulges drawn inaccurately?
A) There should be only one bulge rather than two. B) They should be aligned with the Sun rather than the Moon. C) They should be much smaller compared to Earth. D) They should be more pointy in shape.
An electron is sent at high speed toward a gold nucleus (charge +79e). What is the electrical force acting on the electron when it is 3.0 × 10^-13 m away from the gold nucleus? (e = 1.6 × 10^-19 C, ke = 8.99 × 10^9 N•m2/C2)
a. 2.1 × 10^-6 N c. 0.20 N b. 2.0 × 10^-4 N d. 20 N
The eight corners of a cubic lattice unit cell contribute ______________lattice point(s) to the unit cell.
Fill in the blank(s) with the appropriate word(s).
How is a luminosity class assigned to a star?
a. By combining the apparent magnitude with the star's parallax. b. By measuring the period of variability in the star's apparent magnitude. c. By studying the absorption line width in the spectrum of the star. d. By observing the angular size of the star's image in a photograph or digital image.