Generally speaking, how does the surface temperature and luminosity of a protostar compare to the surface temperature and luminosity of the main-sequence star it becomes?
A) A main-sequence star is cooler and dimmer than it was as a protostar.
B) A main-sequence star is cooler and brighter than it was as a protostar.
C) A main-sequence star is hotter and brighter than it was as a protostar.
D) A main-sequence star is hotter and dimmer than it was as a protostar.
D
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Standing Sound Waves: A string that is 0.26 m long is vibrating in its n = 6 harmonic. The sound from this string excites a pipe that is 0.88 m long and open at both ends into its second overtone resonance. What is the common resonant frequency of the string and the pipe? The speed of sound in air is 345 m/s.
A. 590 Hz B. 390 Hz C. 490 Hz D. 690 Hz E. 760 Hz
The Schmidt corrector plate largely cures spherical aberration, giving a wide, flat field of view
Indicate whether the statement is true or false
A particle (charge = +40 ?C) is located on the x axis at the point x = ?20 cm, and a second particle (charge = ?50 ?C) is placed on the x axis at x = +30 cm. What is the magnitude of the total electrostatic force on a third particle (charge = ?4.0 ?C) placed at the origin (x = 0)?
a. 41 N b. 16 N c. 56 N d. 35 N e. 72 N
On December 21, the noonday Sun is overhead at what latitude?
a. 0° b. 23.5°N c. 23.5°S d. That of the Tropic of Cancer