☰ Contents · Physics

Engine problems and Chapter III review

Lessons 32–33 · 2 lessons · P. Habibullayev, A. Boydedayev, A. Bahromov, K. Suyarov, J. Usarov, M. Yuldasheva. Physics Grade 9, revised and expanded 3rd edition. G‘afur G‘ulom Publishing House, Tashkent, 2019
Answers are for parents and teachers.
1
Ideal engine: T₁ = 800 K, T₂ = 200 K, Q₁ = 4000 J. Find A and Q₂ (J).
2
A 20 kW engine runs for 1 hour. Useful work in MJ?
3
η = 25 %, Q₂ = 1500 J. Q₁ (J)?
4
What does the Carnot formula show and why are temperatures in kelvins?
5
Write a short 5-sentence conclusion on reducing the environmental impact of engines.