Calculate a) the x- and y-components of the momentum vector of a 25 kg mass traveling at 120 m/s in a direction of 120 degrees relative to the +x-axis and b) the magnitude of the momentum vector and c) the angle of the momentum vector. a mass of 40 kg travels to the right at 32 m/s. a second mass of 25 kg travels to the left at 54 m/s. calculate the total vector momentum of the system of masses. 7. a 6.5 kg rife fires a 4.5 gram bullet with muzzle velocity of 820 m/s. calculate the recoil velocity of the rifle.

Acylinder with a movable piston contains 11.7 moles of a monatomic ideal gas at a pressure of 1.32×10^5 pa. the gas is initially at a temperature of 300 k. an electric heater adds 43200 j of energy into the gas while the piston moves in such a way that the pressure remains constant. cp=20.79 j k^−1 mol^−1 for a monatomic ideal gas, and that the number of gas molecules is equal to avogadro's number (6.022×10^23) times the number of moles of the gas. (a) what is the temperature of the gas after the energy is added? (b) what is the change in volume of the gas? (c) how much work is done by the gas during this process?

Under the action of a constant force an object accelerates at 7.8 m/s2. what will the acceleration be if (a) the force is halved? (b) the object's mass is halved? (c) the force and the object's mass are both halved? (d) the force is halved and the object's mass is doubled?

How many electrons in an atom could have these sets of quantum numbers? =3n=3 electronselectrons =4,ℓ=2n=4,ℓ=2 electronselectrons =6,ℓ=ℓ=−1n=6,ℓ=2,mℓ=−1