Pls Answer all Will mark the first person to answer brainliest

Alfred pushes on a heavy box, but cannot move it. the box has a lot of inertia motion friction gravity

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.

Achild has maximum walking speed of 1.6 m/s. what is the length of the child's legs? 0.26 m