Which eats more for its size (volume)?
1) a man
2) a mouse
3) an elephant
4) each eats approximately an amount of food in proportion to its size.
This is because
5) the smaller the animal is, the more radiating area it has proportional to its volume.
6) the larger the animal is, the more radiating area it has proportional to its volume.
7) neither of these has any bearing on the dietary behavior of living creatures.
Answer: 2, 5
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Suppose you are using the Doppler technique to look for planets around another star. What must you do?
A) Compare many spectra of an orbiting planet taken over a period of many months or years. B) Compare the brightness of the star over a period of many months or years. C) Carefully examine a single spectrum of an orbiting planet. D) Compare many spectra of the star taken over a period of many months or years.
A dielectric material such as paper is inserted between the plates of a capacitor as the capacitor holds a fixed charge on its plates. What happens to the electric field between the plates as the dielectric is inserted?
A) There is no change in the field. B) The field becomes stronger. C) The field becomes weaker. D) The field reduces to zero.
The satellite most critical to the study of the formation and structure of the universe is ________, which detected the ripples that led to galaxies
A) WMAP B) Fermi C) Planck D) HST E) COBE
A 0.30-?F capacitor is connected to a 400-V battery. What potential energy is stored in the capacitor?
a. 1.3 × 10^?3 J b. 6.0 × 10^?4 J c. 4.8 J d. 0.024 J e. 0.048 J