What is the speed of any light wave in a vacuum?

1) 3x10^8 m/s
2)infinity fast

Ahydroelectric plant takes energy from water and turns it into electrical energy. what are the transformations of energy in the water molecules that are used in the process of generating electricity this way?

Transfer chemicals from one location to another to weather objects. a-water b-physical weathering c-chemical weathering

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