Understanding Work in Thermodynamic Processes

The video tutorial explains various thermodynamic processes using PV diagrams, including isobaric, isochoric, isothermal, adiabatic, and cyclic processes. It details how to calculate work done by gases in these processes, emphasizing the importance of understanding the area under the curve in PV diagrams. The tutorial provides formulas and examples for each process, highlighting key concepts like constant pressure, volume, and temperature, as well as the significance of direction in cyclic processes.

In an isobaric process, if a gas expands from 4 liters to 12 liters at a constant pressure of 5 atm, how much work is done by the gas in joules?

• 2026 joules

• 4052 joules

• 1013 joules

• 5065 joules

What is the work done by a gas in an isochoric process when the pressure changes from 4 atm to 2 atm?

• 2026 joules

• 4052 joules

• 1013 joules

• Zero

In an isothermal process, what formula is used to calculate the work done by the gas?

• CVΔT

• nRT ln(Vf/Vi)

• PΔV

• PV = nRT

For an isothermal expansion of 5 moles of nitrogen gas from 3 liters to 9 liters at 400 K, what is the work done by the gas?

• 18269 joules

• 4052 joules

• 5065 joules

• 1013 joules

In an adiabatic process, what is the value of heat transferred?

• Positive

• Negative

• Zero

• Depends on the process

What is the work done by argon gas expanding adiabatically from 0.01 m³ at 20x10⁵ Pa to 0.03 m³ at 4x10⁵ Pa?

• 48000 joules

• 36000 joules

• 12000 joules

• 24000 joules

In a cyclic process, how is the work done determined?

• By the change in temperature

• By the change in pressure

• By the area under the PV curve

• By the change in volume

If a cyclic process moves in a clockwise direction, what is the sign of the work done?

• Depends on the pressure

• Zero

• Negative

• Positive

What is the work done per cycle if the system moves from A to B to C to D to A, with a pressure difference of 6x10⁵ Pa and a volume change of 0.06 m³?

• 24000 joules

• 36000 joules

• 48000 joules

• 60000 joules

In a counterclockwise cyclic process, what is the sign of the work done?

• Negative

• Depends on the volume

• Zero

• Positive