What is the momentum of a 800 kg car traveling at 20 m/s

What kind of air would be characteristic of a continental polar air mass? o a cold, dryob. warm, humido c. warm, dryo d. cold, wet

List and describe three ways that humans can change ecosystems and three ways that humans can protect ecosystems.

Calculate the magnitude of the force that the shell exerts on a positive point charge q located a distance r