You are standing near a railroad track and a train is moving toward you at 60 mph and blowing its horn. What will you notice as the train moves past you?
a. As the train approaches, the horn will sound lower in pitch than when the train is moving away.
b. As the train approaches, the horn will sound higher in pitch than when the train is moving away.
c. There will be no change in the pitch of the horn as it moves by.
d. The horn will get louder as the train moves away from you.
e. The horn will get quieter as the train moves toward you.
b
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As an interstellar gas cloud shrinks in size, the law of conservation of angular momentum predicts it will
A) heat up. B) slow down in its rotation. C) cool off. D) continue shrinking. E) rotate faster.
X-rays with an energy of 400 keV undergo Compton scattering from a target. The scattered rays are deflected at an angle of 38° relative to the direction of the incident rays.What is the energy of the scattered x-rays?
a. 343 keV b. 300 keV c. 400 keV d. 2410 keV
A very loud train whistle has an acoustic power output of 100 W. If the sound energy spreads out spherically, what is the intensity level in dB at a distance of 89.0 meters from the train? (I0 = 10?12 W/m2)
a. 20.7 dB b. 70.0 dB c. 90.0 dB d. 95.0 dB e. 207 dB
Which statement is correct about the relationship between the instantaneous speed and the magnitude of the instantaneous velocity?
A) The average speed can be less than, greater than or equal to the magnitude of the average velocity. B) The instantaneous speed is always equal to the magnitude of the instantaneous velocity. C) The average speed is always less than or equal to the magnitude of the average velocity. D) The instantaneous speed is always greater than or equal to the magnitude of the instantaneous velocity. E) The average speed is always one-half the magnitude of the average velocity.