The temperature of a rigid cubic box, 15cm on a side, is filled with nitrogen gas (N2) at standard temperature and pressure. The box is later raised to 25oC. What is the heat input required to perform this act?
A. 31.4 J
B. 47.1 J
C. 78.4 J
D. 157 J
E. 52.3 J
F. 94.1 J
A. 31.4 J
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Heat escapes from a planet's surface into space by thermal radiation. In which wavelength range do planets radiate most of their light?
A) infrared B) radio C) visible D) ultraviolet E) x-rays
Two bulbs are shown in a circuit that surrounds a region of increasing magnetic field directed out of the page. When the switch is open,
A. bulb 1 is glowing; bulb 2 is dark. B. bulb 2 is glowing; bulb 1 is dark. C. both bulbs glow equally brightly. D. both bulbs glow one half as brightly as they do with the switch closed. E. both bulbs are dark.
When we see a region of a planet that is not as heavily cratered as other regions, we conclude that
A) the planet formed after the age of bombardment and missed out on getting hit by leftover planetesimals. B) the surface in the region is older than the surface in more heavily cratered regions. C) the planet is rotating very slowly and only one side was hit by impactors. D) the surface in the region is younger than the surface in more heavily cratered regions. E) there is little volcanic activity to create craters.
Which of the following particles interact via the strong interaction?
A. gravitons B. quarks C. leptons D. neutrinos