The total mass of a binary system can be calculated from
a. the ratio of the angular separation from the center of mass of each of the stars.
b. the distance to the binary and its radial velocity.
c. the semimajor axis and period of the orbit.
d. the radial velocities of the two stars.
e. the time required for the smaller star to eclipse the larger star.
c
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How many times does the Moon rotate on its axis in one orbital period?
A. several times B. twice C. only once D. The Moon does not rotate.
The larger the parallax shift, the closer an object is to us
Indicate whether the statement is true or false
You are making a circular turn in your car on a horizontal road when you hit a big patch of ice, causing the force of friction between the tires and the road to become zero. While the car is on the ice, it
A) moves along a straight-line path away from the center of the circle. B) moves along a straight-line path toward the center of the circle. C) moves along a straight-line path in its original direction. D) continues to follow a circular path, but with a radius larger than the original radius. E) moves along a path that is neither straight nor circular.