Hydrogen gas was cooled from 150c to 50c. its volume is 75.0 ml. what was its original volume?

What is the coefficient of kinetic friction μk between the block and the tabletop?

Lightning is an example of what phenomenon? a release of a large amount of energyan absorption of a large amount of energya natural electric circuita natural electric current

Ais a machine that makes work easier when a single force is applied. a simple machine b compound machine c endangered machine d complex machine