When water vapor is cooled it three forms into water droplets why does this represent a conservation in mass

What is the formula for calculating the mass when i have the number of volume and density

A 1000-kg car traveling at 66 m/s hits a 2000-kg car at rest and the two travel together after the collision. calculate the speed with which they move.

Saturn has an orbital period of 29.46 years and it's average distance to the sun is 9.54 AU if Venus has an orbital period of 0.62 years what is its average distance to the sun in AU

Which statement is true regarding radioactive particles subjected to an electric field?

Sam and Francis move a couch from their living room to a moving truck using a combined force of 60 Newtons. The distance from the living room to the truck is 13 m. How much work did they do?

Which of Newton's laws, when combined algebraically with his law of universal gravitation, can be used to calculate Earth's mass? A) first B) second C) third

Why does a balloon filled with helium rise while a balloon filled with an equal volume of average atmospheric air does not? A. Helium has no mass, but air does. B. Helium increases the balloon's mass more than air. C.

Consider the following controls in an automobile in motion : gas pedal, brake, steering wheel. what are the controls in this list that cause an acceleration of the car?

What material are oil pipelines made from?

3/129 A 175-lb pole vaulter carrying a uniform 16-ft, 10-lb pole approaches the jump with a velocity v and manages to barely clear the bar set at a height of 18 ft. As he clears the bar, his velocity and that of the pole are essentially zero.