Why is it so difficult to study the center of our galaxy?
a. Light from the center is lost in the glow of emission nebulae in this direction
b. Interstellar dust blocks almost all light before it reaches Earth.
c. The exact position of the center is not known.
d. The center of the galaxy puts out very little radiation and is too dim to study.
e. The center of the galaxy is too far away for radiation to be detected by telescopes.
b
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You are driving along a highway at 35.0 m/s when you hear the siren of a police car approaching you from behind and you perceive the frequency as 1340 Hz
You are relieved that he is in pursuit of a different speeder when he continues past you, but now you perceive the frequency as 1300 Hz. What is the speed of the police car? The speed of sound in air is 343 m/s. A) 38.4 m/s B) 30 m/s C) 39.2 m/s D) 40.1 m/s E) 41.7 m/s
A sound wave in a metal bar is an example of a longitudinal wave
Indicate whether the statement is true or false
Dark energy
A) has mass. B) has never been directly observed in the laboratory. C) pushes on space. D) All of the above. E) None of the above.
A spring with a force constant of 2.00 N/m is attached to a mass of 75.0 g. The system has a small amount of damping. If the amplitude of the oscillations decreases from 10.0 mm to 5.00 mm in 15.0 s, what is the magnitude of the damping constant?
A) 0.00693 Ns/m B) 0.0462 Ns/m C) 0.00762 Ns/m D) 0.0100 Ns/m E) 0.00857 Ns/m