V391 pegasi b is a star that is 4,570 light years away from earth. what is this distance in kilometers? (one light year is about 9.46 trillion kilometers.) 4,323 trillion kilometers 4,323 kilometers 43,232 kilometers 43,232 trillion kilometers 43,232 billion kilometers nextreset

The equation that describes a transverse wave on a string is y = (0.0120 m)sin[(927 rad/s)t - (3.00 rad/m)x] where y is the displacement of a string particle and x is the position of the particle on the string. the wave is traveling in the +x direction. what is the speed v of the wave?

An object has a weight of 500 on earth what is the mass of this object

Arailroad car collides with and sticks to an identical railroad car that is initially at rest. after the collision, the total kinetic energy of the two cars is a) the same as before. b) half as much as before. c) one third as much as before. d) one fourth as much as before. e) twice as much as before.