When a gun is fired how come yhe recoil is not strong enough to knock the shooter over?

When the force acting on an object points at least partially in the direction of the motion the work done is considered to be negative

Explain why electric current cannot exist if a current doesn't have a voltage source.

Abag of potato chips contains 2.00 l of air when it is sealed at sea level at a pressure of 1.00 atm and a temperature of 20.0 deg c. what will be the volume of the air in the bag if you take it with you, still sealed, to the mountains where the temperature is 7.00 deg c and atmospheric pressure is 70.0 kpa? assume that the bag behaves like a balloon and that the air in the bag is in thermal equilibrium with the outside air.