Consider a situation where change in momentum come from a change in mass rather than that coming from a change in velocity of an object: rocket propulsion. The propelling gases exert force on the rocket. The gases are expelled at a rate of R = 1300 kg/s with a speed of v = 4.5 × 104 m/s. a) What is the mass expelled in time ∆t. Label this mass ∆m. b) How much momentum does the mass carry, in terms of ∆t, R, and v. c) Use the relationship between the average force and change in momentum to obtain the expression for the average force in terms of R and v and calculate its value.

What is the angular momentum of the bar about the axle?

Which of the following are appropriate acceleration units?

Two manned satellites approaching one another at a relative speed of 0.550 m/s intend to dock. the first has a mass of 2.50 ✕ 103 kg, and the second a mass of 7.50 ✕ 103 kg. assume that the positive direction is directed from the second satellite towards the first satellite. (a) calculate the final velocity after docking, in the frame of reference in which the first satellite was originally at rest.(b) what is the loss of kinetic energy in this inelastic collision? (c) repeat both parts, in the frame of reference in which the second satellite was originally at rest. final velocity(d) loss of kinetic energy = ?