Assume a hydrogen atom is a sphere with diameter 0.100 nm and a hydrogen molecule consists of two such spheres in
contact. (a) What fraction of the space in a tank of hydrogen
gas at 0°C and 1.00 atm is occupied by the hydrogen mole-
cules themselves? (b) What fraction of the space within one
hydrogen atom is occupied by its nucleus, of radius 1.20 fm?

The motor m applies a time-varying force of f (200 t) n, where t is in seconds. box b with mass 200 kg starts from rest, and the coefficients of kinetic and static friction are 0.2 and us 0.3 the acceleration due to gravity is g 9.8 m/s2 b 300 a) find the time ' when the box starts to move. b) calculate the speed of the crate at 3 s c) calculate the power delivered by the motor at t 3 s

Determine the age of a fossil if it had only one eighth of its original carbon-14 content remaining?

This is the number of complete movements of a wave per second.