You are driving along a highway at 35.0 m/s when you hear the siren of a police car approaching you from behind at constant speed and you perceive the frequency as 1310 Hz
You are relieved that he is in pursuit of a different driver when he continues past you, but now you perceive the frequency as 1240 Hz. What is the frequency of the siren in the police car? The speed of sound in air is 343 m/s.
A) 1300 Hz
B) 1320 Hz
C) 1270 Hz
D) 1360 Hz
E) 1370 Hz
C
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The graph shows 
versus t for an object moving along straight line. What is the acceleration at t = 11 s?
A. -10 
B. 10
C. 22
D. -22
Assuming the conditions ripe for life and intelligence abound in the Galaxy, what factor limits the number of galactic civilizations currently in existence?
A) the average survival time of the civilizations B) the lack of metals for technology C) the speed of technological development D) the expansion of the universe E) the number of supernova explosions
Which of the following statements is an inference from a model (rather than an observation)?
A) The Sun emits neutrinos. B) The photosphere emits visible light. C) The photosphere is made out of mainly hydrogen and helium. D) The corona is hotter than the photosphere. E) The Sun's core is gradually turning hydrogen into helium.
A uniform solid sphere of mass M and radius R rotates with an angular speed ? about an axis through its center
A uniform solid cylinder of mass M, radius R, and length 2R rotates through an axis running through the central axis of the cylinder. What must be the angular speed of the cylinder so it will have the same rotational kinetic energy as the sphere? A) 2?/5 B) ? C) 4?/5 D) 2?/ E) ?/