4-28. Sketch a Carnol cycle for an ideal gas on a (a) u-v diagram, (b) u·T diagram, (c) u-h diagram, (d) p. T diagram. ANSWER: u – v diagram u·T diagram u-h diagram p. T diagram. 4-30. A Carnot engine is operated between two heat reservoirs at temperatures of 400 K and 300 K. (a) If the engine reoeives 1200 Cal from the reservoir at 400 K in each cycle, how many Calories does it reject to the reservoir at 300 K? (b) If the engine is operated as a refrigerator (i.e., in reverse) and receives 1200 Cal from the reservoir at300 K, how many Calories does it deliver 10 the reservoir at 400 K? (c) How much work is done by the engine in each case
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RIGID BODIES : ROTATION ABOUT AN AXIS 1. Sebuah batang yang sangat ringan, panjangnya 140 cm, dan bekerja tiga gaya F1 = 20 N, F2 =10 N, F3 =40 N dengan arah dan posisi seperti gambar. Besar momen gaya yang menyebabkan batang berotasi pada pusat massanya adalah… ANSWER: Know, F1 = 20 N, F2 = 10 N, F3 = 40 N Pusat rotasi massa = proses ditengah-tengah batang ∑Ʈ = Ʈ1- Ʈ2 + Ʈ3 = F 1 l 1 – F 2 l 2 + F 3 l 3 = (20 N) (0,7) – (10 N) (0,3) + (40 N) (0,7) = 14 Nm – 3Nm + 28 Nm = 39 Nm 2. Sebuah katrol dari pejal dengan tali yang dililitkan pada sisi luarnya ditampilkan pada gambar. Gesekan katrol diabaikan. Jika momen inersia katrol I = dan tali ditarik dengan gaya tetap F, maka nilai F setara dengan… ANSWER : I = a ∑Ʈ = I . a