11. Momentum & Impulse

In a closed, isolated system, two objects collide and no external forces act on them. What is the total momentum of the system immediately after the collision?

Object A moves at 10 m/s at 53° and Object B moves at 5 m/s at –37° as shown below. Calculate the magnitude of the system's total momentum if both objects have a mass of 2kg.

A small rocket burns 0.0500 kg of fuel per second, ejecting it as a gas with a velocity relative to the rocket of magnitude 1600 m/s. What is the thrust of the rocket?

Two football players collide on a frictionless field and stick together. If the total momentum of the system before the collision is $p_{\mathrm{initial}}$, what is the total momentum of the system immediately after the collision?

The first three energy levels of the fictitious element X were shown in Figure P38.54. An electron with a speed of 1.4×10⁶ m/s collides with an atom of element X. Shortly afterward, the atom emits a photon with a wavelength of 1240 nm. What was the electron’s speed after the collision? Assume that, because the atom is much more massive than the electron, the recoil of the atom is negligible. Hint: The energy of the photon is not the energy transferred to the atom in the collision.

A 110-kg tackler moving at 2.5 m/s meets head-on (and holds on to) an 82-kg halfback moving at 4.4 m/s. What will be their mutual speed immediately after the collision?