10. A man stands on slick ice, so there is no friction between him and the groun

Question

10. A man stands on slick ice, so there is no friction between him and the ground. He then holds a rifle to his shoulder and fires a bullet out of it. What is the complete system of particles that will conserve momentum in the X direction which is parallel to the ground? A. The man, the rifle, the bullet, and the Earth. B. The rifle and the bullet. C. The man, the rifle, and the bullet. D. The rifle, the bullet, and the Earth. E. The bullet and the Earth 11. A sled slides down a snow covered hill and it is found that the kinetic energy of motion it has at the bottom is slightly less than the gravitational potential energy it had at the top of the hill. This is likely because A. some of the original gravitational potential energy has been converted into elastic potential energy of deformation and the sled changes shape during the slide down the hill. B. the friction between the sled and the snow did some work during the slide down the hill, converting some of the original gravitational potential energy to heat energy in the snow. C. total energy is not conserved in this interaction because the collision between the hill and the sled is a perfectly elastic collision. D. total energy is not conserved in this interaction because the collision between the hill and the sled is a perfectly inelastic collision. E.the low thermal energy in the cold snow is not enough to compensate for the energy lost converting from the original gravitational potential energy to the final kinetic energy

Explanation / Answer

10] option c is correct. Initially all three [man, rifle, bullet] were at rest, upon firing man+rifle moves backward while bullet moves forward. Rifle exerts a force on bullet and by Newtons third law, bullet also exerts force on rifle.

So to make this force internal, we will take [man, rifle, bullet] system . Earth is not applying any horizntal force, so no need to include it.

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