In recent years, many planetary systems have been discovered around distant stars. This has been accomplished, not by direct observation of the planets themselves, but indirectly, by observing a wobbling motion in the star
Why is this wobbling motion evidence of a planet?
The center of mass of the star-planet system is stationary or moves with constant velocity. If a planet is orbiting the star, what is actually happening is that both the planet and the star are in orbit around the center of mass of the system. Seen from far away, this appears as a wobble in the position of the star.
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What is a shock wave?
A) a pressure wave that moves slower than the speed of sound B) a pressure wave that moves faster than the speed of sound C) an electromagnetic wave that can create electrical shocks D) an electromagnetic wave created when electrons recombine with protons E) a pressure wave that moves faster than the speed of light
Stars of types ________ and ________ are found only in the youngest star clusters
Fill in the blank(s) with correct word
Dripstone formations that form on cavern floors are called _____________
a. stalactites b. pool stones c. stalagmites d. sedimentary
A box is dropped onto a conveyor belt moving at 2 m/s. If the coefficient of friction between the box and the belt is 0.3, how long before the box moves without slipping?