A hurricane's source of energy is
A) strong winds.
B) evaporation of cool seawater.
C) heat released from condensing water.
D) rapidly sinking air.
Answer: C
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Which statement about extrasolar planets found to date is true?
A) All are terrestrials, comparable in size to Earth. B) All lie more than 2 AU from their star. C) Most have orbital periods of more than a year. D) Some are so close to their stars that their periods are just a few days. E) Few are found by Doppler shifts of their stars, due to their gravity.
How did the Hipparcos mission revolutionize our knowledge of stellar properties?
What will be an ideal response?
A 40-?C charge is positioned on the x axis at x = 4.0 cm. Where should a ?60-?C charge be placed to produce a net electric field of zero at the origin?
a. ?5.3 cm b. 5.7 cm c. 4.9 cm d. ?6.0 cm e. +6.0 cm
Where does the energy come from when nuclear fission takes place?
a. From the chemical energy released by changing one element into another. b. From the kinetic energy introduced into the nucleus by the bombarding neutron. c. From the larger binding energies of the fission products of the original nucleus. d. From the mass of the neutron absorbed, which is lost as energy. e. From the electrical energy introduced into the nucleus by the bombarding neutron.