Why is it better to breathe through the nose than the mouth?

Wind and moving water provide energy. question 1 options: chemical mechanical thermal none of the above

Abumper car with a mass of 250 kg is traveling at a speed of 4 m/s. this bumper car collides and sticks to a second bumper car with a mass of 250 kg, which is initially at rest. what is the final speed of these two bumper cars after the collision, assuming they remain stuck together?

How does the strength of the electrostatic force between an electron and a proton compare to the strength of the gravitational force between them?