Gravity always acts towards the center of the earth. TRUE OR FALSE?

What is the internal energy of 4.00 mol of diatomic nitrogen gas n2 at 455k

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.

Is there a point between a 10 nc charge and a 20 nc charge at which the electric field is zero?