What speed must a neutron have if its de Broglie wavelength is 0.255 nm?

What is the angular momentum of the bar about the axle?

What is the power rating of the lightbulb if 3.0 a flow through it when connected to a 15 v battery

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.