What is the speed of a periodic wave with a frequency of 4.5 hz and a wavelength of 0.9m

Which graph best represents the relationship between the electric current and the rate at which a magnet is turning inside an electric generator?

What is the role of the ocular lens?

Athermometer is removed from a room where the temperature is 70° f and is taken outside, where the air temperature is 10° f. after one-half minute the thermometer reads 60° f. what is the reading of the thermometer at t = 1 min? (round your answer to two decimal places.) ° f how long will it take for the thermometer to reach 30° f? (round your answer to two decimal places.)