A tennis ball bounces off a brick wall. Which of the following is true?
A. The momentum of the ball is conserved in this process
B. If the collision is elastic, then the ball's velocity does not change in this process
C. The total momentum of the ball, wall, and Earth is conserved in this process
D. None of these choices are true
Answer: C
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In a resonating pipe that is open at one end and closed at the other, there
A) are displacement nodes at each end. B) are displacement antinodes at each end. C) is a displacement node at the open end and a displacement antinode at the closed end. D) is a displacement node at the closed end and a displacement antinode at the open end.
An astronomer would find a type Ia supernova in a distant galaxy useful as a(n) ____
a. spiral tracer b. gravitational lens c. age calibration d. rotation curve e. standard candle
All the following statements are true. Which one explains why our calendar has leap years?
A) Earth's axis precesses with a period of about 26,000 years. B) There is a difference between a sidereal year and a tropical year. C) A tropical year is slightly more than 365 days. D) Earth's speed varies as it orbits the Sun.
If you are in the Moon's umbral shadow, then you are witnessing
A) nighttime. B) some kind of lunar eclipse. C) a total solar eclipse. D) a partial solar eclipse. E) a total lunar eclipse.