Aquarterback passes a football to a receiver on a windless day. why are the initial horizontal speed (just as it leaves the quarterback's hand) and the final horizontal speed (just before it's caught) the same? you may ignore the effects of air friction.
a. gravity pulls on the ball during its flight.
b. the vertical speed increases during the ball's flight.
c. there is no acceleration in the horizontal (or x) direction.
d. actually, they're not the same.

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

At very high pressures, gases become and will eventually a) more dense; become hotter b) more dense; change to a liquid or solid c) less dense; combust d) less dense; turn into a liquid

The diagram shows a series of volcanic island and a hot spot determine the direction of movement of the tectonic plate that for the island