The diagrams show the movement of particles for two substances. The left image labeled X shows spaced out green balls with long movement lines behind them. The right image shows tightly cluster green balls with short movement lines behind them.

Which best compares the temperatures of the substances?

Substance X has the highest temperature because its particles have more kinetic energy.
Substance X has the highest temperature because it has fewer particles.
Substance Y has the highest temperature because its particles have more kinetic energy.
Substance Y has the highest temperature because it has more particles.

First, launch the video below. you will be asked to use your knowledge of physics to predict the outcome of an experiment. then, close the video window and answer the question at right. you can watch the video again at any point. part a as in the video, we apply a charge +q to the half-shell that carries the electroscope. this time, we also apply a charge –q to the other half-shell. when we bring the two halves together, we observe that the electroscope discharges, just as in the video. what does the electroscope needle do when you separate the two half-shells again? view available hint(s) as in the video, we apply a charge + to the half-shell that carries the electroscope. this time, we also apply a charge – to the other half-shell. when we bring the two halves together, we observe that the electroscope discharges, just as in the video. what does the electroscope needle do when you separate the two half-shells again? it deflects more than it did at the end of the video. it deflects the same amount as at end of the video. it does not deflect at all. it deflects less than it did at the end of the video. submit

If the area of a square has increased by a factor of 16, by how much has each side increased?

Atemperature inversion can cause a warm air mass to move over a colder air mass. this traps the colder air mass and prevents surface air from rising. this may result in which of these? a) smog b) acid rain c) freezing rain d) a thunderstorm