Listed following are various physical situations that describe how light interacts with matter. match these to the appropriate category. view available hint(s) visible light does not pass through a black wall. cell phone signals pass through walls. red light hits a red sweatshirt. visible light meets clear glass. white light hits a white piece of paper. blue light hits a red sweatshirt. light comes from your computer screen. light comes from a light bulb.

Power can be defined as a. the distance over which work was done. b. how much work can be done in a given time. c. all the work in an given area. d. the energy required to do work.

When an object is heated it contracts. a. true b. false

The great sandini is a 60.0-kg circus performer who is shot from a cannon (actually a spring gun). you don’t find many men of his caliber, so you him design a new gun. this new gun has a very large spring with a very small mass and a force constant of 1100 n/m that he will compress with a force of 4400 n. the inside of the gun barrel is coated with teflon, so the average friction force will be only 40.0 n during the 4.00 m he moves in the barrel. at what speed will he emerge from the end of the barrel, 2.50 m above his initial rest position?