When we say that momentum is "conserved," we mean When we say that momentum is "conserved," we mean: a. The momentum of an object is the same before and after a collision.
b. The momentum of the universe increases; it never decreases.
c. If there are no forces acting on an object, its momentum is zero.
d. The momentum of an isolated system is constant.

This chart shows characteristics of three different types of waves. which statement is best supported by the information in the chart? wave x and wave y are mechanical waves, and wave z is an electromagnetic wave. wave x and wave y are electromagnetic waves, and wave z is a mechanical wave. wave x and wave z are electromagnetic waves, and wave y is a mechanical wave. wave x and wave z are mechanical waves, and wave y is an electromagnetic wave.

Which model displays the change in a gas when the temperature of the gaseous system decreases?

Which sentences describe point source pollution? in this type of pollution, the source of the pollution is single and easily identifiable. when runoff water from the melting of snow mixes with debris, it creates pollution. the runoff water, mixed with pollutants, reaches large areas with disastrous effects. alternatively, when a wastewater treatment plant releases harmful chemicals into a stream, the chemicals pollute the stream water because they are not treated for safety.