If y = 0.02 sin (30x ? 400t) (SI units), the frequency of the wave is
a. 30 Hz
b. 15/? Hz
c. 200/? Hz
d. 400 Hz
e. 800? Hz
c
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__________ galaxies contain large clouds of gas and dust, both young and old stars, but have no obvious spiral arms or nucleus
a. Irregular b. S0 c. E7 d. Sa e. E0
Recall that an up quark (u) has a charge of +2/3 and a down quark (d) has a charge of -1/3. Which of the following quark compositions describes a proton?
A) uuu B) uud C) udd D) uuudd
A ball is thrown straight up, reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball is coming down
A) Both its velocity and its acceleration point upward. B) Its velocity points upward and its acceleration points downward. C) Its velocity points downward and its acceleration points upward. D) Both its velocity and its acceleration point downward. E) Neither velocity nor acceleration can be determined without additional information.
Kepler's second law tells us that a planet sweepa out equal areas in equal times. If you compare the amount of area per time swept by Earth with the one of Jupiter, you would conclude:
A) They sweep the same area per time. B) Jupiter sweeps a larger area per time because it has much more mass than Earth. C) Jupiter sweeps a larger area per time because it has a much larger orbital path than Earth. D) Earth sweeps a larger area per time because it has much less mass than Jupiter. E) Earth sweeps a larger area per time because it has a much smaller orbital path than Jupiter.