Two identical stars with mass m orbit around their center of mass. each orbit is circular and has radius
r, so that the two stars are always on opposite sides of the circle.
(a) find the gravitational force of one star on the other.
(b) find the orbital speed of each star.
(c) find the period of the orbit of each star.
(d) how much energy would be required to separate the two stars to infinity?
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Describe the path of a ray that approaches a mirror parallel to the principal axis.
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Alead ball is dropped into a lake from a diving board 5m above the water . it hits the water with a certain velocity and then sink with constant velocity in bottom . it reaches the bottom 5 second after it is dropped if g= 10m/s2 . find depth of the lake and average velocity of the ball ?
Answers: 1
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