A 45-g superball traveling at 28 m/s bounces off a brick wall and rebounds at 24 m/s. A high-speed camera records this event. If the ball is in contact with the wall for 3.6 ms, what is the average acceleration of the ball during this time interval? Assume the positive direction is away from the wall. Average acceleration=
A. 14440 m/s^2
B. 13650 m/s^2
C. 17900 m/s^2
D. 15690 m/s^2
E. 11840 m/s^2
F. 14380 m/s^2

The pressure, volume, and temperature of a mole of an ideal gas are related by the equation pv = 8.31t, where p is measured in kilopascals, v in liters, and t in kelvins. use differentials to find the approximate change in the pressure if the volume increases from 14 l to 14.6 l and the temperature decreases from 375 k to 370 k. (round the answer to two decimal places.)

Astudent is performing an experiment comparing sound and light waves. the student gathers the following data. what conclusion does the student most likely make based on this data? light waves always travel the same speed; however, the speed of sound is determined by the medium that it travels through. all sound waves always have the same energy, so the temperature of the medium does not affect wave speed. light needs to vibrate particles, so it travels fastest in tightly packed solids, while sound does not need a medium, so it travels fastest in a gas. tightly packed particles in solids slow down the light waves; however, sound waves make particles bounce into each other, so they travel faster in solids.

If steel is more dense that lake water, why can a boat float