When the current through a circular loop is 4.20 A, the magnetic field at its center is 5.21\times 10^{-4}~\text{T}5.21×10 −4 T. What is the radius of the loop?

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.)

If angle "a" is 25°, angle "b" is: a) equal to angle c b) less than angle c c) greater than angle c

Afrequency generator sends a 550 hz sound wave through both water and ice. what is the difference in wavelength between the wave produced in ice and the wave produced in water?