Heat and Work - Page 4
Questions
- Calculate the work done by the system in an irreversible (single step) adiabatic expansion of 2 mole of a polyatomic gas (#gamma#= 4/3) from 300 K and pressure 10 atm to 1 atm : ? (a) -227 R (b) -205 R (c) -405 R (d) None of these
- This was a question from Pradeep book for Class 11 Physics. Is the question incomplete and requires more information? If no, please give me a solution. Thanks!
- When 53000000J of heat is added to a gas enclosed in a cylinder fitted with a light friction less piston maintained at atmospheric pressure,the volume is observed to increase from 1.9m^3 to 4.1 m^3.What is the change in internal energy of the gas?
- How does conduction, convection and radiation work to transfer heat from an electric radiator in your bathroom?
- Two masses, m1 =1.9kg and m2= 1.4kg, are attached by a string passing over a pulley as shown in the diagram below. The angle of inclination is theta= 25 degrees. The system is set in motion, and the masses travel a distance h= 1.3m at a constant speed?
- A 1.0 kW heater supplies energy to a liquid of mass 0.50 kg. The temperature of the liquid changes by 80 K in a time of 200 s. The specific heat capacity of the liquid is 4.0 kJ kg–1K–1. What is the average power lost by the liquid?
- 400g of water at temperature 15°c is placed in an electric kettle.The power rating of kettle is at 3.0kw.calculate the energy required to raise the temperature to 100°c?
- Why is the efficiency in the below question 0.25 not 0.33?
- How much energy (in joules) is released when 0.06 kilograms of mercury is condensed to a liquid at the same temperature? A. 17,705.1 J B. 20,075.04 J C. 51,302.88 J D. 697.08 J
- A piston whose area is 50 cm 2 moves through a distance of 30 cm against a pressure of two atmospheres. Calculate the work done in Lt. atm., Nm and calories?
- Why do the metal fins in the refrigerator get warm? what is the source of this heat?
- If a heater with power 1000 W gives #3.6*10^6# heat energy in 1 hour. What will be the temperature raised in 50kg of water with temperature #30^@#C by that heat?
- Two litres of an ideal gas at a pressure of 10 atm expands isothermally into a vacuum until total volume is 10 litres. How much heat is absorbed and how much work is done in expansion?
- Why do the metal fins in the refrigerator get warm? what is the source of this heat?
- After a system is added 40-J heat, the system does 30-J work. How do you find the change of the system’s internal energy?
- What is the amount of energy liberated in joules when 85 g of water cools from 45 C to 25 C.?
- In one cycle, a heat engine takes in 810 J of heat from a high-temperature reservoir, releases some heat to a lower-temperature reservoir, and does 411 J of work. What is its efficiency?
- A gas in a cylinder with a moveable piston is heated with 94 J of energy, causing the piston to rise. If the internal energy of the system increases by 30 J, how much work is done by the gas?
- A system releases 318 kJ of heat while 289 kJ of work is done on the system. What is the change in internal energy?
- A heat engine with an efficiency of 17 % does 836 J of work in each cycle. How much heat must be supplied from the high-temperature source in each cycle?