Two cars collide with each other. Before the collision, one car (m = 1300 kg)

is going north at 30 m/s and the other car (m = 900 kg) is going south at 15

m/s. What is the momentum of the system made up of the two cars after the

collision?

Your class decides to build a circuit to make a light bulb shine. When you are finished, you have a setup with wires, a light bulb and a battery. What role does the battery play in this circuit design? A) The battery works as the system's wires.

The force needed to overcome static friction is usually less than that needed to overcome kinetic friction. true or false?

A rocket burns fuel to produce blank the force that moves the rocket forward

Which of the following correctly describes a longitudinal wave?

A ball on an extremely low-friction, tilted surface will slide downhill without rotating. If the surface is rough, however, the ball will roll. Explain.

What happens if a hypothesis is not supported?

a group of elements that stretch bend and conduct heat and electricity

A rectangular block has dimensions 2.9 cm x 3.5 cm x 10.0 cm. the mass of the block is 615.0 g. what is the volume and density of the block? (answer it with correct numbers of significant figures)

Which of the following are products of cellular respiration? Sunlight Oxygen ATP Water Carbon Dioxide

Do magnetic field lines ever start or end anywhere?