1. A proton has a charge.
positive
negative
neutral
2.
and are two subatomic particles found in the nucleus of an atom
electrons; neutrons
protons; neutrons
protons; electrons
3.
A(n) is a subatomic particle that has a negative charge.
proton
electron
neutron

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.