The uncertainty in position of a positron in a certain state is 1 nm. the uncertainty in its momentum can be 5.0 times 10^-26 kg middot m/s 4.0 times 10^-24 kgmiddotmiddot m/s 3.0 times 10^-24 kgmiddotmiddot m/s only (b) and (c) only (a) none of the above

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.