Carnot Engine: A real (non-Carnot) heat engine, operating between heat reservoirs at temperatures of 450 K and 270 K, performs 3.3 kJ of net work, and rejects 8.2 kJ of heat in a single cycle.(a) What is the thermal efficiency of this heat engine?(b) What is the maximum efficiency it could possibly have?
Fill in the blank(s) with the appropriate word(s).
(a) 0.29 (b) 0.40
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What is the approximate volume of the average adult human body?
A. 0.05 
B. 0.1
C. 0.5
D. 1
A 10.0-?F capacitor is plugged into a 110 V rms 60.0-Hz voltage source, with an ammeter in series. What is the rms value of the current through the capacitor?
A. 0.202 A (rms) B. 0.415 A (rms) C. 0.626 A (rms) D. 0.838 A (rms) E. 0.066 A (rms)
As a star's temperature increases, the frequency of peak emission also increases
Indicate whether the statement is true or false
Why is Earth's continental crust lower in density than seafloor crust?
A) Continental crust is made as the lowest-density seafloor crust melts and erupts to the surface near subduction zones. B) Continental crust is made from the volcanic rock called basalt. C) Continental crust comes from volcanoes, while seafloor crust comes from geysers. D) Continental crust comes from Earth's inner core, while seafloor crust comes from the outer core.