What is the impulse needed to stop a 45-kg boy who is running at 6 m/s in 3 seconds?

Alightning strike consists of charge moving from a cloud to the ground . in one particular case, the electrons in a lightning strike are confined to travel within a radius of 1.5 m and to move at a speed of 5.0 x 10 m/s. if the density of electrons in the strike is 10'15 electrons/m what current is carried by the lightning ?

Around faucet handle is part of a(n) a. lever b. screw c. inclined plane d. wheel and axle

Which of the choices below is one of the primary gases found in the atmosphere? a. helium b. carbon dioxide c. nitrogen d. argon