Samara stands on the ground. Gravity is applying a force to pull her body to the ground while the ground is applying the same amount of force to push back up against her body. Is this an example of a balanced force or action-reaction forces? Does Newton's third law still apply? Explain how you know.

How many molecules are present in 3 mols of silicon dioxide (sio2)?

Ms.hidalgo opens the door to her classroom. her classroom is 60 degrees and the air outside is 80. predict what will happen using your knowledge of how heat flows.

An ice-making machine inside a refrigerator operates in a carnot cycle. it takes heat from liquid water at 0.0 degrees celsius and rejects heat to a room at a temperature of 19.2 degrees celsius. suppose that liquid water with a mass of 76.3kg at 0.0 degrees celsius is converted to ice at the same temperature. take the heat of fusion for water to be l_f = 3.34*10^5 j/kg.how much energy e must be supplied to the device? express your answer in joules.