A heat engine absorbs energy of magnitude |QH| as heat from a high temperature reservoir, does work of magnitude |W|, and transfers energy of magnitude |QL| as heat to a low temperature reservoir. Its efficiency is:
A. |QH|/|W|
B. |QL|/|W|
C. |QH|/|QL|
D. |W|/|QH|
E. |W|/|QL|
Ans; D. |W|/|QH|
You might also like to view...
A capacitor in an RC circuit is charged, storing energy 1.25 mJ. What is the time required to discharge this capacitor, as compared to the time required to discharge an identical capacitor in an identical RC circuit which has stored 2.5 mJ?
A. twice the time B. half the time C. the same time D. the answer depends on the values of R and C.
Do you remember how we do measure distances to stars?
A: inverse square law B: p-p chain C: parallax D: measure sizes E: none of the above
When a cool gas is placed between a glowing wire filament source and a diffraction grating, the resultant spectrum from the grating is which one of the following?
a. line emission b. line absorption c. continuous d. monochromatic
A system of an electron, a proton, and a neutron has a net charge of
a. +1.6 × 10^-19 C. b. –1.6 × 10^-19 C. c. 3.2 × 10^-19 C. d. zero.