Anna applies a force of 19.5 newtons to push a book placed on a table. if the normal force of the book is 51.7 newtons, what is the coefficient of kinetic friction? a0.01 b0.20 c0.38 d0.48

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.