Suppose you live in the United States and you see a crescent moon in your evening sky tonight. What will a friend in South America see tonight?
A) Your friend will also see a crescent moon.
B) Your friend will see a first quarter moon.
C) Your friend will see a gibbous moon.
D) Your friend won't see the Moon tonight, because it is up only in the morning.
A
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A jet aircraft, in level flight at constant speed, is observed directly overhead. A sonic boom is heard 13.0 s later, at which time the line of sight to the aircraft forms a 51° angle with respect to the horizontal. The speed of sound is 325 m/s
The altitude of the aircraft is closest to A) 6700 m. B) 5400 m. C) 8300 m. D) 2700 m. E) 13,000 m.
A block lies on a smooth inclined plane tilted at an angle of 35° to the horizontal
(a) Draw the free-body diagram for the block. (b) Determine the block's acceleration as it slides down the inclined plane. (c) If the block started from rest 8.5 m up the incline from its base, determine the block's speed when it reaches the bottom of the incline. (d) How long did it take the block to reach the bottom of the inclined plane?
Quasars are most common with red shifts
a. less than 0.1 b. less than 0.5 c. of about 2 d. greater than 6 e. greater than 8
The Big Bang is a theory describing the ____
a. birth of our Solar System b. start of civilization on Earth c. beginning of planet formation d. beginning of the Universe e. massive extinction of dinosaurs