50 points do this in your own words do not copy from somewhere else!

in a heat engine, if 1000j if heat enters the system and the piston does 500j of work, what is the final internal energy of the system if the initial energy was 2000j?

1. write the equation.
2. list out the know variables.
3. plug in the numbers into the equation.
4. solve.
5. write your solution statement that includes initial energy and final energy.

In a sample of oxygen gas at room temperature, the average kinetic energy of all the balls stays constant. which postulate of kinetic molecular theory best explains how this is possible? a. attractive forces between gas particles are negligible because the particles of an ideal gas are moving so quickly. b. collisions between gas particles are elastic; there is no net gain or loss of kinetic energy. c. gases consist of a large number of small particles, with a lot of space between the particles. d. gas particles are in constant, random motion, and higher kinetic energy means faster movement.

Alarge marble is dropped in a graduated cylinder with 35ml of water in it.the water level increases to 49ml.what is the volume of the marble

Table sugar completely dissolved in water is an example of a?