A common property of all waves is the relationship between the speed (v), the wavelength (?), and the frequency of the wave (f). The correct equation for this relationship is which of the following?
A. v = f/?
B. v = f?
C. ? = vf
D. f = v?
Answer: B
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A current in a solenoid with N turns creates a magnetic field at the center of that loop. The field strength is directly proportional to:
a. number of turns in the loop. b. current strength. c. Both choices A and B are valid. d. None of the above are valid.
For main-sequence stars, which of the following is true about low-mass stars compared to high-mass stars?
A) Low-mass stars are cooler and less luminous than high-mass stars. B) Low-mass stars are hotter and more luminous than high-mass stars. C) Low-mass stars are cooler but more luminous than high-mass stars. D) Low-mass stars are hotter but less luminous than high-mass stars. E) Low-mass stars have the same temperature and luminosity as high-mass stars.
Simple Pendulum: Tarzan swings back and forth on a long vine. His friend Jane notices in amazement that he makes 30 complete swings in 2.4 minutes.(a) What is the frequency (in hertz) of Tarzan's swing?(b) How long is the vine he is using?
What will be an ideal response?
The gravitational field at the earth due to the moon is (the mass of the moon is 
kg and separated by a distance of 
A. 
B. 
C. 
D. 
E. 