Recent questions tagged entropy of a liquid or a solid

+2 votes

1 answer

A 12 kg steel container has 0.2 kg superheated water vapor at 1000 kPa, both at 200°C. The total mass is now cooled to ambient temperature

asked Apr 3, 2019 in Mathematics by kratos

+1 vote

1 answer

A foundry form box with 25 kg of 200°C hot sand is dumped into a bucket with 50 L water at 15°C. Assuming no heat transfer with the surroundings

asked Feb 21, 2019 in Mathematics by kratos

+2 votes

1 answer

A piston/cylinder with constant loading of piston contains 1 L water at 400 kPa, quality 15%. It has some stops mounted so the maximum possible

asked Feb 8, 2019 in Mathematics by kratos

+2 votes

1 answer

A thermal storage is made with a rock (granite) bed of 70 ft^3 which is heated to 720 R using solar energy. A heat engine receives a QH

asked Feb 1, 2019 in Mathematics by kratos

+3 votes

1 answer

When huge amount of sewage is dumped into a river, its B.O.D. will (a) increase (b) decrease

asked Jan 30, 2019 in Chemistry by kratos

+3 votes

1 answer

The water in a shallow pond heats up during the day and cools down during the night. Heat transfer by radiation,

asked Jan 29, 2019 in Mathematics by kratos

+2 votes

1 answer

Amar is engaged in manufacturing of refrigerators. He surveyed the market and found that customers need a refrigerator with a separate provision

asked Jan 12, 2019 in Class 12 by kratos

+3 votes

1 answer

A 5 kg aluminum radiator holds 2 kg of liquid R-134a both at –10°C. The setup is brought indoors and heated with 220 kJ from a heat source at 100°C.

asked Jan 9, 2019 in Mathematics by kratos

+2 votes

1 answer

Find the total work the heat engine can give out as it receives energy from the rock bed of 2 m^3 which is heated to 400 K using solar energy.

asked Dec 30, 2018 in Mathematics by kratos

+3 votes

1 answer

Four point masses are placed in a plane so that their centre of mass is at (1, 1). Three of them are of mass m each and are placed at (0, 0), (2, 0)

asked Dec 29, 2018 in JEE by kratos

+2 votes

1 answer

A thermal storage is made with a rock (granite) bed of 2 m^3 which is heated to 400 K using solar energy. A heat engine

asked Dec 25, 2018 in Mathematics by kratos

+1 vote

1 answer

Steam at 500 kPa, 300oC is used to heat cold water at 15°C to 75°C for domestic hot water supply. How much steam per kg

asked Dec 15, 2018 in Mathematics by kratos

+3 votes

1 answer

A pan in an autoshop contains 5 L of engine oil at 20°C, 100 kPa. Now 2 L of hot 100°C oil is mixed into the pan. Neglect any work term

asked Dec 6, 2018 in Mathematics by kratos

+2 votes

1 answer

A 1 gallon jug of milk at 75 F is placed in your refrigerator where it is cooled down to the refrigerators inside temperature of 40 F.

asked Dec 6, 2018 in Mathematics by kratos

+3 votes

1 answer

A piston/cylinder assembly contains 2 kg of liquid water at 20°C, 100 kPa and it is now heated to 300°C by a source at 500°C. A pressure

asked Oct 20, 2018 in Mathematics by kratos

+2 votes

0 answers

The interior of the refrigerator is maintained at 5°C. If the surrounding temperature is 30°C,

asked Oct 18, 2018 in Class 11 by kratos

+1 vote

1 answer

A 2 m^2 window has a surface temperature of 15°C and the outside wind is blowing air at 2°C across it with a convection heat transfer coefficient

asked Oct 9, 2018 in Mathematics by kratos

+1 vote

1 answer

40 g of water at 60°C is poured into a vessel containing 50 g of water at 20°C.

asked Oct 2, 2018 in Class 12 by kratos

+1 vote

1 answer

An escalator raises a 100 kg bucket of sand 10 m in 1 minute. Determine the rate of work done during the process.

asked Aug 11, 2018 in JEE by kratos

+2 votes

1 answer

Two kg of liquid lead initially at 500°C are poured into a form. It then cools at constant pressure down to room temperature of 20°C

asked Aug 11, 2018 in Mathematics by kratos

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