1. The Carnot cycle uses an ideal gas that completes a cycle by going under adiabatic and isothermal processes. (a) Find the amount of work that will be done in this cycle. Present your solution thoroughly by showing the graph at each step, the amount of work and heat for each step and the net work that you will find. (b) If the efficiency of this cycle is calculated as the amount of work that you get to the amount of energy (heat) that is paid, derive the equation of efficiency in terms of heat of cold and hot reservoir. Is there also a way to represent efficiency in terms of temperatures of hot and cold reservoir? (c) From your answers to parts (a) and (b) explain thoroughly why you can’t have a heat engine with 100% efficiency?

when insulating materials rub against each other, they may become electrically charged . electrons , which are negatively charged, may be 'rubbed off' one material and on to the other. the material that gains electrons becomes negatively charged. the material that loses electrons is left with a positive charge.

i am pretty sure it is c because when people are closer together, they cannot move as freely. picture being in a mostly full elevator, for instance. the people are right next to you, and you can barely move.

b. lifting dumbbell weight at 20-degree angle from the body after a 45-degree angle

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.