General relativity, rather than special relativity, must be used for which kind of frame of reference a. frame of reference moving backward at constant velocity b. frame of reference that is accelerating c. a frame of reference that is at rest d. a frame of reference moving forward at a constant velocity

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.)