Stars only exhibit a Doppler shift if they are moving
A) away from us along the line of sight
B) perpendicular to our line of sight
C) in a circular motion about us
D) toward or away from us along the line of sight
D
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A cubic box with sides of 20.0 cm contains 2.00 × 1023 molecules of helium with a root-mean-square speed (thermal speed) of 200 m/s
The mass of a helium molecule is 3.40 × 10-27 kg. What is the average pressure exerted by the molecules on the walls of the container? The Boltzmann constant is 1.38 × 10-23 J/K and the ideal gas constant is R = 8.314 J/mol ? K = 0.0821 L ? atm/mol ? K. A) 3.39 kPa B) 1.13 kPa C) 570 Pa D) 2.26 kPa E) 9.10 Pa
Because protostars are at a low temperature and surrounded by dust and gas, astronomers must observe them with ________.
A. ultraviolet telescopes B. gamma ray telescopes C. radar D. infrared and radio telescopes
The acceleration of a ball as it rolls down a ramp is 4 m/s2 . The ball is referred to 2 s after it starts to roll. The acceleration after starting from rest is __________
Fill in the blank(s) with correct word
As a 4-10 solar mass star leaves the main sequence on its way to becoming a red supergiant, its luminosity:
A) decreases. B) first decreases, then increases. C) increases. D) remains roughly constant. E) first increases, then decreases.