Imagine a landing craft approaching the surface of callisto, one of jupiter's moons. if the engine provides an upward force (thrust) of 2880 n, the craft descends at constant speed; if the engine provides only 1944 n, the craft accelerates downward at 0.39 m/s2. what is the weight of the landing craft in the vicinity of callisto's surface?

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.