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  1. Problems
  2. /Heat & Thermodynamics

Heat & Thermodynamics

Physics

Temperature, heat transfer, and gas laws.

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72 problems
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1.
0.50 kg of water at 75 °C is poured into 1.5 kg of water at 15 °C in an insulated jug.
High School (11–12) · Heat Engines, the Second Law and EntropyStemPy LabStemPy Lab
Hard
2.
0.75 mol of an ideal gas in an insulated box rushes into a vacuum when a wall is removed, growing…
High School (11–12) · Heat Engines, the Second Law and EntropyStemPy LabStemPy Lab
Medium
3.
1800 J of heat flows from a very large body at 540 K to a very large body at 270 K.
High School (11–12) · Heat Engines, the Second Law and EntropyStemPy LabStemPy Lab
Medium
4.
0.35 kg of ice at 0 °C melts, and the water then warms to 20 °C.
High School (11–12) · Heat Engines, the Second Law and EntropyStemPy LabStemPy Lab
Easy
5.
A Carnot engine works between 880 K and 286 K and gives out 12 kW of mechanical power.
High School (11–12) · Heat Engines, the Second Law and EntropyStemPy LabStemPy Lab
Hard
6.
A refrigerator keeps its inside at 4 °C in a kitchen at 32 °C.
High School (11–12) · Heat Engines, the Second Law and EntropyStemPy LabStemPy Lab
Medium
7.
A Carnot engine works between 450 K and 306 K.
High School (11–12) · Heat Engines, the Second Law and EntropyStemPy LabStemPy Lab
Medium
8.
An engine takes 4200 J of heat from its hot reservoir each cycle and gives 2940 J to the cold one.
High School (11–12) · Heat Engines, the Second Law and EntropyStemPy LabStemPy Lab
Easy
9.
A gas goes round a cycle of three steps.
High School (11–12) · Heat Engines, the Second Law and EntropyStemPy LabStemPy Lab
Medium
10.
Say whether each process is nearly reversible or irreversible, and give a reason.
High School (11–12) · Heat Engines, the Second Law and EntropyStemPy LabStemPy Lab
Medium
11.
An inventor claims a machine that takes 3200 J of heat from the water of a lake in each cycle and…
High School (11–12) · Heat Engines, the Second Law and EntropyStemPy LabStemPy Lab
Easy
12.
A gas goes round a rectangle on a pressure-volume graph.
High School (11–12) · Heat Engines, the Second Law and EntropyStemPy LabStemPy Lab
Easy
13.
A gas with γ = 1.40 at 5.5 × 10⁵ Pa fills 1.2 litres.
High School (11–12) · Thermodynamic Processes and Specific Heats of GasesStemPy LabStemPy Lab
Hard
14.
1.0 mol of an ideal gas (γ = 1.40) at 320 K and 1.0 atm expands to three times its volume, once…
High School (11–12) · Thermodynamic Processes and Specific Heats of GasesStemPy LabStemPy Lab
Easy
15.
1.2 mol of a monatomic ideal gas at 450 K expands adiabatically until it has cooled to 310 K.
High School (11–12) · Thermodynamic Processes and Specific Heats of GasesStemPy LabStemPy Lab
Medium
16.
Air (γ = 1.40) at 1.0 × 10⁵ Pa and 290 K is squeezed quickly to 1/12 of its volume.
High School (11–12) · Thermodynamic Processes and Specific Heats of GasesStemPy LabStemPy Lab
Medium
17.
0.80 mol of a monatomic ideal gas goes from A to C in two steps.
High School (11–12) · Thermodynamic Processes and Specific Heats of GasesStemPy LabStemPy Lab
Hard
18.
1.2 mol of an ideal gas at 310 K is squeezed slowly at a steady temperature from 24 to 6.0 litres.
High School (11–12) · Thermodynamic Processes and Specific Heats of GasesStemPy LabStemPy Lab
Medium
19.
A student says: 'In an isothermal expansion of an ideal gas the temperature does not change, so no…
High School (11–12) · Thermodynamic Processes and Specific Heats of GasesStemPy LabStemPy Lab
Medium
20.
0.40 mol of a diatomic ideal gas is at 290 K and 1.5 × 10⁵ Pa.
High School (11–12) · Thermodynamic Processes and Specific Heats of GasesStemPy LabStemPy Lab
Medium
21.
For a certain ideal gas γ = 1.25. Find Cv and Cp.
High School (11–12) · Thermodynamic Processes and Specific Heats of Gases, Kinetic Theory of GasesStemPy LabStemPy Lab
Medium
22.
A gas heated at a steady pressure takes in 1540 J.
High School (11–12) · Thermodynamic Processes and Specific Heats of Gases, Kinetic Theory of GasesStemPy LabStemPy Lab
Medium
23.
How much heat does 2.5 mol of nitrogen need to warm by 35 K (a) in a rigid tank and (b) at a steady…
High School (11–12) · Thermodynamic Processes and Specific Heats of Gases, Kinetic Theory of GasesStemPy LabStemPy Lab
Easy
24.
Find Cv, Cp and γ for (a) neon, a monatomic gas, and (b) nitrogen at room temperature, a diatomic…
High School (11–12) · Thermodynamic Processes and Specific Heats of Gases, Kinetic Theory of GasesStemPy LabStemPy Lab
Easy
25.
A gas goes clockwise round a triangle ABCA on a pressure-volume graph.
High School (11–12) · Laws of ThermodynamicsStemPy LabStemPy Lab
Hard
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