Recent questions tagged entropy of ideal gases

+3 votes

1 answer

Consider a Carnot-cycle heat pump having 1 kg of nitrogen gas in a cylinder/piston arrangement. This heat pump operates between reservoirs

asked Apr 5, 2019 in Mathematics by kratos

+3 votes

1 answer

A rigid tank contains 2 kg of air at 200 kPa and ambient temperature, 20°C. An electric current now passes through a resistor

asked Mar 25, 2019 in Mathematics by kratos

+1 vote

1 answer

A liquid is compressed in a reversible adiabatic process. What is the change in T?

asked Mar 24, 2019 in Mathematics by kratos

+1 vote

1 answer

Consider a small air ****** with a cylinder volume of 1 cm^3 at 250 kPa, 27°C. The bullet acts as a piston initially held by a trigger.

asked Mar 14, 2019 in Mathematics by kratos

+3 votes

1 answer

A piston/cylinder contains air at 2500 R, 2200 lbf/in.^2, with V1 = 1 in.^3, Acyl = 1 in.^2 . The piston is released and just before the piston

asked Mar 12, 2019 in Mathematics by kratos

+2 votes

1 answer

Air in a rigid 1 m^3 box is at 300 K, 200 kPa. It is heated to 600 K by heat transfer from a reversible heat pump that receives energy

asked Mar 7, 2019 in Mathematics by kratos

+2 votes

1 answer

A mass of 1 kg of air contained in a cylinder at 1.5 MPa, 1000 K, expands in a reversible isothermal process to a volume 10 times larger.

asked Mar 5, 2019 in Mathematics by kratos

+2 votes

1 answer

Nitrogen at 90 lbf/in.^2, 260 F is in a 20 ft^3 insulated tank connected to a pipe with a valve to a second insulated initially empty

asked Mar 2, 2019 in Mathematics by kratos

+2 votes

1 answer

A 1-m^3 insulated, rigid tank contains air at 800 kPa, 25°C. A valve on the tank is opened, and the pressure inside quickly drops to 150 kPa,

asked Feb 27, 2019 in Mathematics by kratos

+1 vote

1 answer

Find the speed of sound for air at 15 lbf/in.2, at the two temperatures of 32 F and 90 F.

asked Feb 14, 2019 in Mathematics by kratos

+1 vote

1 answer

Two rigid tanks, each contain 10 kg N2 gas at 1000 K, 500 kPa. They are now thermally connected to a reversible heat pump,

asked Feb 11, 2019 in Mathematics by kratos

+3 votes

1 answer

An insulated cylinder/piston contains carbon dioxide gas at 120 kPa, 400 K. The gas is compressed

asked Jan 16, 2019 in Mathematics by kratos

+2 votes

1 answer

Nitrogen at 600 kPa, 127°C is in a 0.5 m^3 insulated tank connected to a pipe with a valve to a second insulated initially

asked Jan 15, 2019 in Mathematics by kratos

+2 votes

1 answer

Why is an electric light bulb not filled with air ? Explain why argon or nitrogen is filled in an electric bulb.

asked Jan 14, 2019 in Class 11 by kratos

+3 votes

1 answer

Two springs with same spring constant are installed in a massless piston/cylinder with the outside air at 100 kPa.

asked Jan 2, 2019 in Mathematics by kratos

+2 votes

1 answer

A substance is at 300 lbf/in.2, 65 F in a rigid tank. Using only the critical properties can the phase of the mass

asked Dec 27, 2018 in Mathematics by kratos

+2 votes

1 answer

Argon in a light bulb is at 90 kPa and heated from 20°C to 60°C with electrical power. Do not consider any radiation, nor the glass mass.

asked Dec 23, 2018 in Mathematics by kratos

+1 vote

1 answer

A cylinder has 0.1 kg air at 25°C, 200 kPa with a 5 kg piston on top. A valve at the bottom is opened to let the air out and the piston

asked Dec 22, 2018 in Mathematics by kratos

+3 votes

1 answer

A mass of 1 kg of air contained in a cylinder at 1.5 MPa, 1000 K, expands in a reversible adiabatic process to 100 kPa.

asked Dec 19, 2018 in Mathematics by kratos

+2 votes

1 answer

Hydrogen gas is contained in a rigid container. A second rigid container of equal volume contains oxygen gas.

asked Dec 18, 2018 in Class 12 by kratos

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