A piston–cylinder assembly contains 0.9 kg of air at a temperature of 300 K and a pressure of 1 bar. The air is
compressed to a state where the temperature is 470K and the pressure is 6 bar. During the compression, there is
a heat transfer from the air to the surroundings equal to 20 kJ. Determine the work during the process in kJ, Plot
the process in PV diagram.

and is the work done on or by the system

Can you think of a way a rock unit with an older fossil could be above a rock until with a younger fossil? describe the scenario.

The energy released by a chemical reaction can be measured using a calorimeter. when barium hydroxide octahydrate crystals are reacted with dry ammonium chloride inside of a coffee cup calorimeter, the temperature of the 18.00 g of water in the calorimeter decreases from 30.0°c to 8.0°c. the equation for calculating energy absorbed or released by a reaction is: where q is the energy released or absorbed, m is the mass of water in the calorimeter, cp is the specific heat of water, and δt is the observed temperature change. if the specific heat of liquid water is 4.19 j/g·°c, how much energy was absorbed by the reaction?

The pressure proportional to the area a- inversely b- directly c- increase d-decrease