Very massive stars lose their outer layers in a planetary nebula
a. True
b. False
Indicate whether the statement is true or false
False
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An apparent westward motion of a planet in the sky compared to the background stars (as viewed from Earth) when observed on successive nights is referred to as
a. epicycle. b. retrograde motion. c. prograde motion. d. heliocentric motion. e. deferent.
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
Spiral galaxies are much more common in the centers of rich clusters than in the universe as a whole
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While the red color of the Martian surface testifies to the presence of lots of iron, the weak magnetic field suggests it may not have a molten core anymore
Indicate whether the statement is true or false