The graph for position versus time is given for a car. What can you say about the velocity of the car over time?
A. it speeds up all the time
B. it slows down all the time
C. it moves at constant velocity
D. sometimes sometimes
it speeds up and it slows
E. not really sure
it slows down all the time. When looking at a position graph, the velocity is represented by the slope of
the line. Since the slope of the graph is gradually decreasing, so is the velocity.
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A main difference between a radio wave and a light wave is
A) wavelength. B) frequency. C) both of these D) neither of these
If the Moon is setting at noon, the phase of the Moon must be
A) full. B) first quarter. C) third quarter. D) waning crescent. E) waxing crescent.
Although we know less about dark matter in elliptical galaxies than in spiral galaxies, what does current evidence suggest?
A) Unlike the broad distribution of dark matter in spiral galaxies, elliptical galaxies probably contain dark matter only near their centers. B) Elliptical galaxies probably contain far more dark matter than spiral galaxies. C) Elliptical galaxies probably contain about the same proportion of their mass in the form of dark matter as do spiral galaxies. D) Elliptical galaxies probably contain far less dark matter than spiral galaxies.
A truck moving at 36 m/s passes a police car moving at 45 m/s in the opposite direction. If the frequency of the siren is 500 Hz relative to the police car, what is the frequency heard by an observer in the truck after the police car passes the truck? (The speed of sound in air is 343 m/s.)
a. 361 b. 636 c. 393 d. 396 e. 383