A sphere of surface area 1.25 m2 and emissivity 1.0 is at a temperature of 100°C. At what rate does it radiate energy into empty space? (? = 5.67 × 10-8 W/m2 ? K4 )
A) 7.1 W
B) 0.71 mW
C) 1.4 kW
D) 9.9 mW
E) 3.7 W
C
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Which of the following most likely explains why Venus does not have a global magnetic field like Earth?
A) It does not have a metallic core. B) It has too thick of an atmosphere. C) Unlike Earth, Venus does not have a liquid outer core. D) Its rotation is too slow.
To deduce the interior conditions of the dense regions in which stars form, it is necessary for astronomers to observe in the ________ part of the spectrum
Fill in the blank(s) with correct word
The interval from new Moon to first quarter is about a(n)
A) hour. B) day. C) week. D) month. E) year.
Which of the following does quantum theory agree with?
A) Microscopic particles, rather than the macroscopic world, form the fundamental reality. B) Future events are entirely predetermined, or predictable. C) It is possible to analyze physical phenomena and physical systems by separating them into their component parts and studying those parts individually. D) All of the above. E) None of the above.