What is the magnetic force on a proton that is moving at 2.5 x 10 7 m/s up through a magnetic field that is 0.12 T and pointing toward you ? the charge on a proton is 1.6 x 10 -19 C

Why is there friction between objects

Afixed electric space heater wired by a cable with an ampacity of 30 a should draw a maximum current of a. 30 a. b. 24 a. c. 15 a. d. 27 a.

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.)