Heat Engines: A heat engine absorbs 85.6 kJ of heat each cycle and exhausts 61.8 kJ.(a) What is the efficiency of the engine?(b) How much work does it do each cycle?
What will be an ideal response?
(a) 27.8% (b) 23.8 kJ
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What is the lifetime of a 10 solar mass star on the main sequence?
a. 3.2 x 107 years b. 320 years c. 3.2 x 1012 years d. 1 x 109 years e. 1 x 1011 years
A carousel that is 5.00 m in radius has a pair of 600-Hz sirens mounted on posts at opposite ends of a diameter. The carousel rotates with an angular velocity of 0.800 rad/s. A stationary listener is located at a distance from the carousel
The speed of sound is 350 m/s. The maximum beat frequency of the sirens at the position of the listener is closest to A) 6 Hz. B) 8 Hz. C) 10 Hz. D) 12 Hz. E) 14 Hz.
Of the following energies for photons, which is the least energy that could result in photoelectron production if the work function is 3.77 eV?
a. 2.72 eV b. 3.19 eV c. 4.57 eV d. 6.98 eV e. 6.53 eV
What is a perm?
What will be an ideal response?