A cylindrical bottle of oilandvinegar salad dressing whose v

A cylindrical bottle of oil-and-vinegar salad dressing whose volume is 1/3 vinegar (p = 1.01 g/cm^3) and 2/3 oil (p = 0.910 g/cm^3) is at rest on a table. Initially, the oil and the vinegar are separated, with the oil floating on top of the vinegar. The bottle is shaken so that the oil and the vinegar mix uniformly, and the bottle is returned to the table. How has the height of the center of mass of the salad dressing changed as a result of the mixing? It is higher. It is lower. It is the same. It has moved outside of the bottle. There is not enough information to answer this question. An artillery shell is moving on a parabolic trajectory when it explodes in midair. The shell shatters into a very large number of fragments. Choose the correct statement. The force of the explosion will increase the momentum of the system of fragments, and so the momentum of the shell is not conserved during the explosion. The force of the explosion will decrease the momentum of the system of fragments, and so the momentum of the shell is not conserved during the explosion. The center of mass of the system will continue to move on the initial parabolic trajectory until the first fragment touches the ground. The center of mass of the system of fragments will continue to move on the initial parabolic trajectory until the last fragment touches the ground. The center of mass of the system of fragments will have a trajectory that depends on the number of fragments and their velocities right after the explosion.

Solution

2) It is higher