Optics of the Eye: For an eye that is 2.4 cm in diameter, what must be the range of focal lengths of the lens to focus objects from the near point (25 cm) to infinity on the retina?
Fill in the blank(s) with the appropriate word(s).
2.2 cm ? f ? 2.4 cm
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If we use 67 W of power to heat 148 g of water, how long will it take to raise the temperature of the water from 15°C to 25°C? The specific heat of water is 4190 J/kg ? K
A) 93 s B) 5.3 s C) 22 s D) 114 h
State Gay-Lassac's law
What will be an ideal response?
A star's luminosity depends only on the star's
a. distance and diameter. b. temperature and distance. c. distance. d. temperature and diameter. e. apparent magnitude.
How might Mars's weakened magnetic field have allowed for major changes in its climate?
A) Atmospheric gases were left vulnerable to being stripped into space by solar wind particles. B) The heat combined with the magnetic field, and disappeared with it. C) Mars has actually heated up since the magnetic field weakened, since the solar rays no longer have such a dense layer to get through. D) They are completely unrelated; there is no possible influence.