You look up and see a helicopter pass directly overhead. 3.10s later you hear the Sound of the engine. If the air temperature is 23.0°C, how high was the helicopter
flying?

What color of light must blue light mix with to create white light? a. yellow b. white c. blue d. green

Clothes dryer uses about 7 amps of current from a 240 volt line. how much power does it use?

Electromagnetic induction. a coil of wire contains n turns and has an electrical resistance r. the radius of each turn is a. initially, inside the coil there exists a uniform magnetic field of magnitude b0 parallel to the axis of the coil. the magnetic field is then reduced slowly. the current induced in the coil is i. how long does it take for the magnitude of the uniform field to drop to zero?