An ideal heat engine is operating between high and low temperature reservoirs. Suppose that now the low temperature reservoir has its temperature lowered, but no other changes are made. This temperature change affects the engine efficiency in which of the following ways?
A. The efficiency increases
B. The efficiency is unchanged
C. The efficiency decreases
D. There is now no way to calculate the efficiency
Answer: A
You might also like to view...
The following items are positioned in sequence: A source of a beam of natural light of intensity I0, three ideal polarizers A, B, and C; and an observer
Polarizer axis angles are measured clockwise from the vertical, as viewed by the observer. The axis angle of polarizer A is set at 0° (vertical), and the axis angle of polarizer C is set at 50°. The axis angle of polarizer B is set at 120°. What is ratio of the intensity of the beam at the observer to the intensity I0 of the source? A) 0.015 B) 0.020 C) 0.025 D) 0.030 E) 0.035
Water at 4°C will contract when it is slightly
A) cooled. B) warmed. C) both of these D) none of the above
Index of Refraction: A light beam has speed c in vacuum and speed v in a certain plastic. The index of refraction n of this plastic is
A. n = cv. B. n = (v/c)2. C. n = v/c. D. n = c/v. E. n = (c/v)2.
Calculate the kinetic energy (in eV) of a nonrelativistic neutron that has a de Broglie wavelength of 9.9 × 10-12 m. (h = 6.626 × 10-34 J • s, mneutron = 1.675 × 10-27 kg, 1 eV = 1.60 × 10-19 J)
What will be an ideal response?