On a hot day, you are in a sealed, insulated room. the room contains a refrigerator, operated by an electric motor. the motor does work at the rate of 254 w when it is running. assume the motor is ideal (no friction or electrical resistance) and that the refrigerator operates on a reversible cycle. in an effort to cool the room, you turn on the refrigerator and open its door. let the temperature in the room be 325 k when this process starts, and the temperature in the cold compartment of the refrigerator be 264 k. at what net rate is heat added to (+) or subtracted from the room and all of its contents?

Which best represents the law of conservation of mass ?

Acylinder with a movable piston contains 11.7 moles of a monatomic ideal gas at a pressure of 1.32×10^5 pa. the gas is initially at a temperature of 300 k. an electric heater adds 43200 j of energy into the gas while the piston moves in such a way that the pressure remains constant. cp=20.79 j k^−1 mol^−1 for a monatomic ideal gas, and that the number of gas molecules is equal to avogadro's number (6.022×10^23) times the number of moles of the gas. (a) what is the temperature of the gas after the energy is added? (b) what is the change in volume of the gas? (c) how much work is done by the gas during this process?

What is the measure of how much matter is in an object and that can be measured using a balance? a. height b. volume c. weight d. mass