A system consists of 2.0 kg of water at 75°C. 25 J of work is done on the system by stirring with a paddle wheel, while 63 J of heat is removed. What is the change in internal energy of the system? A) -38 J B) 88 J C) 38 J D) -88 J

3600 J of work are done on a container of Argon gas compressing it down from its original state of 1.2 atm, 0.04 m , 19°C. If the gas warms to 110°C how much heat in Joules must enter or leave the system? Heat entering is +, heat leaving is-. Q = %3D

A certain gas is compressed adiabatically. The amount of work done on the gas is 800 J. What is the change in the internal energy of the gas? Question 4 options:   400 J   More information is needed to answer this question.   0 J   -800 J   800 J     For vapor water at 2°C Question 5 options:   Cp < Cv.   Cp > Cv.   Cp = Cv.   More information is needed to answer this question.

Which of the following can effectively lower the internal energy of a room? A A fan B A refrigerator with its door left wide open C An air - conditioner partially exposed to the atmosphere D A refrigerator with its door closed 9.

During the adiabatic expansion, the temperature of 0.1 mol of oxygen drops from 30C to 10C. a) How much work does the gas do? b) How much heat is added?

If a system has a change in energy of 400 J and produces 200 J of work, how much heat was added to the system? 89°F Very high UV Q 800 J 200 J -200 J 600 J F2 2 W S F3 Q+ 3 E F4 D $ 4 F5 R F % 5 F6 O Search T 77 G F7 Y Y F8 & 87 H U F9 * 00 8 J G F10 LA 9 O F11 K F12 Prt Sc Insert no ha Del Backspace

3. A system does 1.80×10° Jof work while 7.50×108 J of heat transfer occurs to the environment. What is the change in internal energy of the system assuming no other changes (such as in temperature or by the addition of fuel)?

Over the course of a day, 4.0 kg of water evaporates from the leaves of a corn plant. a) How much energy is required to evaporate the water? (Assume that the temperature of the leaves is 30C.) b) If the plant is active for 12 hours, how much power does this correspond to? You can think of this as the necessary power to drive transport in the plant.

800 J of work are done BY a system in a process that decreases the thermal energy of the system by 50 J. How much heat is transferred TO the system during this process? If the system gains heat, answer with a positive number. If the system loses heat, answer with a negative number. (in J)  -750  750  -850  -50  0

An electric power plant uses energy from burning coal to generate steam at 450oC. The plant is cooled by 20oC water from a nearby river. If burning coal provides 100MJ of heat, what is the theoretical minimum amount of heat that must be transferred to the river during the conversion of heat to electric energy? a- 100MJ B- 90MJ c- 60MJ D- 40MJ