I'm giving away points every day until Christmas, just be the first to answer. I put it in random subjects, but I give away the date in points. I might continue this after Christmas as well, just free points. Say code: five golden rings to win :)

Describe how the motion of a spring being pushed forward and backward is similar to the motion of air particles in a sound wave.

An electric power distributor charges residential customers $0.10 per kilowatt-hour (kwh). the company advertises that "green power" is available in 150 kwh blocks for an additional $4 per month. (green power is generated from solar, wind power, and methane sources.) if a certain customer uses an average of 391 kwh per month and commits to one monthly 150 kwh block of green power, what is her annual power bill

The resistance of 100 w bulb is less than resistance of 40 w bulb. explain the reason.