0.05 kg bullet is fired to the north from a 4.0 kg rifle that is initially at rest. The bullet leaves the rifle with a momentum of 20 Ns. (a) Determine the total momentum of the bullet-and-rifle before the bullet is fired?

The volume of a gas is halved during an adiabatic compression that increases the pressure by a factor of 2.5. what is the specific heat ratio? show the math steps .

The coefficient of friction is a number that represents the resistance to sliding between two in contact with one another.

An object with initial temperature 130 ∘ f is submerged in large tank of water whose temperature is 50 ∘ f . find a formula for f ( t ) , the temperature of the object after t minutes, if the cooling constant is k = − 0.2 . remember newton's law of cooling (the rate of change of temperature with respect to time is equal to k times the difference between the temperature of the object and the surrounding temperature) ! : )