A noisy machine in a factory produces a decibel rating of 75 dB. How many identical machines could you add to the factory without exceeding the 90 dB limit

What is the equation for electrical work?

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.

Decreased sensitivity to an unchanging stimulus is known as