Question 10.1: Water at 20° C falls from a height of 854 m. If the whole energy is used in increasing the temperature, find out the final temperature. Specific heat of water is 4200 J/K kg.

Question 10.2: 25200 J of heat is supplied to the system while the system does 6000 J of work. Calculate the change in internal energy of the system.

Question 10.3: A sample of ideal gas is uniformly heated at constant pressure. If the amount of 180 J of heat is supplied to the gas, calculate the change in internal energy of the gas and work done by the gas. Take γ=1.41

Question 10.4: 5 moles of oxygen is heated at constant volume from 10° C to 20° C, What will be the change in the internal energy of the gas? The specific heat of oxygen at constant pressure is 8 Cal /mol °C. R=8.36 J/mol °C.

Question 10.5: Find the efficiency of a Carnot’s heat engine working between the steam and ice points?

Question 10.6: A Carnot heat engine absorbs 2000 J of heat from the source of heat engine at 227° C and rejects 1200 J of heat during each cycle to sink. Calculate efficiency of engine temperature of sink and amount of work done during each cycle.

Question 10.7. In a refrigerator, heat from inside at 277 K is transferred to a room at 300 K. How many joules of heat will be delivered to the room for each joule of electric energy consumed ideally?

Question 10.8: What is the least amount of work that must be performed to freeze one gram of water at 0° C by means of a refrigerator? Take the temperature of the surrounding as 37°C. How much heat is passed on to the surrounding during this process?

Question 10.9. Calculate the change in entropy when 10 kg of water is heated from 90°C to 100°C? (Specific heat of water is 4180 J/mole K)

Question 10.10 A system absorbs 1176 J of heat and at the same time does 352.8 J of external work. Find the change in internal energy of the system? Find the change in internal energy in the system when it absorbs 1050 J of heat while 84 J of work is done? What will be …