Which is the most massive star?
A. Star of 0.5 solar masses
B. Coolest possible main sequence star
C. Type B main sequence star
D. Type G main sequence star
E. Hottest possible main sequence star
Ans: E. Hottest possible main sequence star
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A sound wave radiates from a source in all directions. If the power of the sound source is 200 watts, then the intensity level of the sound wave 1000 m from the source is (in dB)
A. 62.8. B. 66.0. C. 68.5. D. 70.5. E. 72.0.
Two optically flat glass plates, 16.0 cm long, are in contact at one end and separated by 0.0200 mm at the other end. The space between the plates is occupied by oil with index of refraction 1.45. The index of refraction of the glass plates is 1.55
The plates are illuminated at normal incidence with monochromatic light, and fringes are observed. If the dark fringes are spaced 2.00 mm apart, what is the wavelength of the monochromatic light? A) 425 nm B) 475 nm C) 525 nm D) 675 nm E) 725 nm
Two identical gliders slide toward each other on an air track. One glider moves at 1 m/s and the other glider moves at 2 m/s. They collide, stick, and move at
A) 1/2 m/s. B) 1/3 m/s. C) 1/6 m/s. D) 3/4 m/s. E) 1.5 m/s.
A solenoid carrying an electric current, if free to rotate when placed in a magnetic field, will tend to orient its axis ________ (parallel, perpendicular, anti-parallel) to the magnetic field.
Fill in the blank(s) with the appropriate word(s).