The diagram below illustrates two stars in a visual binary system and the center of mass of this system. Based on this diagram, what is the ratio of the mass of star A to the mass of star B?
a. 2 to 1
b. 1 to 2
c. 2 to 3
d. 3 to 2
e. 1 to 3
B
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Pulsars slow their pulse rate because:
a. they convert energy of rotation into radiation. b. they drag companion stars around, causing them to slow. c. of friction with the interstellar medium. d. of the conservation of angular momentum.
A force of 10.0 N is applied to a wire with an un-stretched length of 4.00 m and a diameter of 5.00 mm. If the wire changed length by 1.20 mm, then the stress in the wire is
a. 
b. 
c. 
d. 
e. 
Star A is identical to Star B, except that Star A is twice as far from us as Star B. Therefore, ________
A) both stars have the same luminosity, but the apparent brightness of Star A is four times that of B) both stars have the same luminosity, but the apparent brightness of Star B is four times that of C) both stars have the same apparent brightness, but the luminosity of Star B is four times that of D) both stars have the same luminosity, but the apparent brightness of Star B is twice that of Star A
Which of the following is true about the temperature change with increasing elevation above the Earth's surface?
What will be an ideal response?