The amount of water in reservoirs is often measured in acre-ft. one acre-ft is a volume that covers an area of one acre to a depth of one foot. an acre is an area of 43 560 ft2. find the volume in si units of a reservoir containing 20.0 acre-ft of water.

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.

Amother used 150 watts of power to raise a 15 newton object in a time interval of 8.0 seconds. through what vertical distance was the object raised ?

Which system of units is used by only a small number of countries in the world, including the u.s.