Two speakers in a stereo emit identical pure tones. As you move around in front of the speakers, you hear the sound alternating between loud and zero. This occurs because of
a. interference
b. changing sound level
c. diffraction
d. the Doppler effect
e. shock waves
A
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Two 4. ? resistors are connected in parallel, and this combination is connected in series with 3 ?. What is the effective resistance of this combination?
A) 11. ? B) 5. ? C) 7. ? D) 1.2 ? E) 4. ?
What is true about solar system densities?
A) The denser planets lie closer to the Sun. B) In differentiated bodies, the denser materials lie near their surfaces. C) The asteroids all have about the same density. D) Saturn has the same density as water. E) Planetary density increases with increasing distance from the Sun.
Kepler's Second Law of planetary motion states that
A) an imaginary line joining the Sun and planet sweeps out equal areas in equal times B) the further a planet is from the Sun, the faster it moves in its orbit C) the further a planet is from the Sun, the slower it moves in its orbit D) the orbits of planets are ellipses
A car is traveling with a constant speed when the driver suddenly applies the brakes, causing the car to slow down with a constant acceleration of magnitude 3.50 m/s2
If the car comes to a stop in a distance of 30.0 m, what was the car's original speed? A) 10.2 m/s B) 14.5 m/s C) 105 m/s D) 210 m/s E) 315 m/s