Find the speed of a particle whose total energy is twice as much as its rest energy. important: step by step *typed* format preferred. if hand written, write clearly and legibly. be sure answer is correct.

To do work, this truck uses energy stored in chemical fuel and an electrical battery. how much total energy does this truck put out?

Unpolarized light falls on two polarizer sheets whose transmission axes are at right angles. a third polarizer is placed between the first two so that its axis makes a 52-degree angle with the axis of the first polarizer. a) what fraction of the incident light intensity is transmitted through the first polaroid? b) what fraction of the incident light intensity is transmitted through the second polaroid? c) what is the angle of polarization of the light that enters the third polaroid? d) what fraction of the incident light intensity is transmitted through the third polaroid. e) what happens if the middle polaroid is removed?

Explain what will happen if decomposers were apsent from a forest ecoysystem.