If you have a machine that provides a force of 78N and a little old lady who puts 26N of force into the machine, what is the machine's mechanical advantage?

This chart lists four kinds of polymers and their sources. what can be known about all four polymers, despite their differences? they come from living things. they share ionic carbon bonds. they are at least 100 monomers long. they are made of repeating subunits.

Elements in group 2 are all called alkaline earth metals. what is most similar about the alkaline earth metals?

A40 kilogram skier starts at the top of a 12 meter high slope. at the bottom, she is travelling 10 meters per second. how much energy does she lose to friction