During lightning strikes from a cloud to the ground, currents as high as 2.50×10^4 amps can occur and last for about 40.0 microseconds . how much charge is transferred from the cloud to the earth during such a strike?

At 20∘c, the hole in an aluminum ring is 2.800 cm in diameter. you need to slip this ring over a steel shaft that has a room-temperature diameter of 2.804 cm . 1. to what common temperature should the ring and the shaft be heated so that the ring will just fit onto the shaft? coefficients of linear thermal expansion of steel and aluminum are 12×10−6 k−1 and23×10−6 k−1 respectively.