Asmall metal bar whose initial temperature was 20 degrees celsius is dropped into a large container of boiling water. how long will it take the bar to reach 90 degrees celsius if it is known that its temperature increases 2 degrees c in 1 second. how long will it ake the bar to reach 98 c?

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