How does height impact potential energy

Two identical cars with mass m = 1,325 kg are traveling in opposite directions at speeds of 54 m/s. They collide head on. After the collision, both cars recoil and move at 43 m/s, in opposite directions.

Calculate the number of molecules/m3 in an ideal gas at stp.

What causes charges to move in a circuit?

Which statement is correct about the relationship between the average speed and the magnitude of the average velocity for any motion?

Process by which water vapor changes to a liquid Evaporation Condensation Convection radiation

A grocery shopper tosses a (n) 9.1 kg bag of rice into a stationary 19.3 kg grocery cart. The bag hits the cart with a horizontal speed of 6.6 m/s toward the front of the cart. What is the final speed of the cart and bag? Answer in units of m/s.

Where do most metamorphic rocks processes take place?

A 13,500 kg railroad freight car travels on a level track at a speed of 4.5 m/s. It collided and coupled with a 25,000 kg second car, initially at rest and with brakes released. What is the speed of the two cars after collision

What type of waves move energy forward, but the source makes up and down

Why do helium balloons float? Talk about density of atoms and compare to elements in the air.