If the strength of the magnetic field at b is 20 units, the strength of the magnetic field at a is

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.)

The two required components for a generator

Achlorine atom has 17 protons and 18 neutrons. what is its mass number? what is its atomic number?