Will mark in a heat engine, if 700 j of heat enters the system, and the piston does 400 j of work, what is the final internal (thermal) energy of the system if the initial energy is 1,200 j? 1,500 j 900 j 1,100 j 300 j explain your answer.

In a laboratory, nakisha mixes sodium hydroxide solution with an indicator called phenolphthalein. when combined, they create a pink solution. nakisha wonders if mixing other solutions with phenolphthalein will also create this pink color. how could she use the scientific inquiry process to explore it further?

Anne applies a force on a toy car and makes it move forward. what can be said about the forces acting on the toy car at the moment anne applies the force?

What statements accurately describe atoms