What is the first law of gravity??

What is the frequency of a light wave with a wavelength of 620nm

True or false: the cycle of seasons on the earth is caused by the tilt of the earth on its axis toward and away from the sun.

A1,700kg car is being used to give a 1,400kg car a push start by exerting a force of 140n the impulse on the smaller car during the 30.0s of contact is +670kg*m/s. what is the impulse of the smaller car on the larger car? -814 kg*m/s 0kg *m/s -670kg*m/s -550kg*m/s