What is amplitude? i'm pretty dumb lol

What surface does the epithelial tissue cover? a. the surface of the body b. lines internal organs c. forms many glands d. all of the above

When an exothermic reaction releases thermal energy, this energy is select all that apply. useful to do work not useable to do work harnessed to do work dissipated by conduction

Consider a system to be one train car moving toward another train car at rest. when the train cars collide, the two cars stick together. what is the total momentum of the system after the collision? 800 kg • m/s 1,600 kg • m/s 2,400 kg • m/s 4,000 kg • m/s