To set up a demonstration of the heating of gas under adiabatic compression, the procedure involves putting a few scraps of paper into a large gas test tube, which is then sealed off with a piston. if the piston compresses the trapped air very rapidly, the paper will catch fire. if the volume of trapped air is not reduced enough, the demonstration won't work. estimate the factor by which the volume of air trapped by the piston must be reduced for this demonstration to work. why will the paper not catch fire if the piston is depressed slowly? note that, to make this estimate, you'll need to look up values and can make assumptions including, for example, that the burning point of paper is 233 c

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.

Which of the following examples illustrates static friction? a box sits stationary on a ramp. a ball rolling on the lawn eventually comes to rest. a car rounds a curve on a road. a fish swims upstream.

A980-kg sports car collides into the rear end of a 2300-kg suv stopped at a red light. the bumpers lock, the brakes are locked, and the two cars skid forward 2.6m before stopping.the police officer, estimating the coefficient of kinetic friction between tires and road to be 0.80, calculates the speed of the sports car at impact. what was that speed?