The second law of thermodynamics forbids a heat engine to have thermal efficiency of ______________
Fill in the blank(s) with correct word
100%
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A string is stretched with a tension of 120 N. The string has a length of 2.5 meters. The velocity of wave propagation along the string is 220 m/s. The mass per unit length of the string is
a. 
b. 
c. 
d. 
e. 
Which of these variable stars would be classified as a Cepheid?
A) a G giant with a period of 14 hours B) a B supergiant with a period of 0.14 days C) a K giant with a period of 14 days D) an F giant with a period of 14 years E) an M supergiant with a period of 140 days
An airplane traveling at half the speed of sound emits sound at a frequency of 5 000 Hz. At what frequency does a stationary listener hear the sound as the plane approaches, and after it passes by? Assume the airplane is not flying very high
An astronaut in a space suit has a total mass of 143.5 kg and is standing on a scale that reads in newtons inside an elevator. If the elevator accelerates upward at the rate of 1.8 m/s2, what does the scale read?
a. 703.2 N b. 1,406.3 N c. 882.3 N d. 1,664.6 N