8) An external heat source supplies heat to a system at a rate of 187 W as the system does work at a rate of 131 W. At what rate is the internal (thermal) energy of the system changing? Is this rate positive or negative? What does the sign mean in terms of temperature?
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- 1 Question 15 According to the first law of thermodynamics, applied to a gas, the increase in the internal energy during any process: 4 O is independent of the heat input O equals the heat input plus the work done by the gas O is independent of the work done on the gas O equals the work done by the gas minus the heat input equals the heat input minus the work done by the gas800 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 04. With 2.56 × 10^6 J of heat transfer into an engine, it performs only 1.50 × 10^5 J of work. (a)What is the engine’s efficiency? (b) How much heat transfer to the environment takes place?
- A hollow drinking straw is placed in a glass of warm water. Suppose that some of the water started to climb to the top of the straw and cooled down so that the increase in potential energy was balanced by a loss of heat. Which law of thermodynamics forbids this from happening? (A) The 0th law (B) The 1st law (C) The 2nd law (D) The 3rd lawWhat is the theoretical maximum efficiency of a heat engine (Carnot engine) operating between 150.0 C and 400.0 C? O 0.3714 O 0.6250 O 0.3750 O 0.2500 O 0.3560In the following situations, find the change in the internal energy of the system. a) A system absorbs 450 J of heat, and at the same time does 210 J of work. b) 750 J of heat is removed from a gas that is held at constant volume.
- An sulated container holds 100g of water at 30C. A 50g ice cube at 0C is dropped into the water and no heat is allowed to enter or leave the ice water container. What is the final termperature and thermodynamic state of the system after it comes to equilibrium. Hello. This is a practice problem I'm working on and I'm not sure if I'm aproaching the problem correctly. Thank you for the help.On a hot summer day, 2.00 x 106 J of heat transfer into a parked car takes place, increasing its temperature from 33.0°C to 45.2°C. What is the increase in entropy (in J/K) of the car due to this heat transfer alone? J/K