Which of the following is the most usable form of nitrogen to plants?

ammonia

nitrates

nitrous oxide

nitrogen gas

How would doubling the made of an object change the objects potential energy

If a sphere and a cure have the same mass and are propelled up a ramp with the same force, which would travel father up the ramp? explain.

If the temperature were raised very high, classically what would we expect the heat capacity per object to be for this one-dimensional system? give a numerical value. chigh t = __ j/k/object (one reason for the discrepancy is that the high-temperature limit assumes that the number of oscillators is large (n > > 1), which is not the case in this tiny system.)