Two spheres, one with the center core up to r = R/2 hollow and the other solid, have the same mass M and same outer radius R. If they are both rolling at the same linear speed, which one has the greater kinetic energy?
a. The both have the same kinetic energy.
b. The hollow one has the greater kinetic energy.
c. The solid one has the greater kinetic energy.
d. More information is needed to choose an answer.
B
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A tungsten wire is used to determine the melting point of indium. The resistance of the tungsten wire is 6.000 W at 20°C and increases to 9.700 W as the indium starts to melt. atungsten = 4.50 × 10^-3 (°C)-1 . What is the melting temperature of indium?
a. 351°C c. 132°C b. 731°C d. 157°C
Mica is not found in
A) slate. B) schist. C) gneiss. D) quartzite.
Alexander Litvinenko was assasinated with
A. plutonium B. tritium C. radium D. polonium
We do not know for certain whether the general trends we observe in stellar birth masses also apply to brown dwarfs. But if they do, then which of the following would be true?
A) Brown dwarfs would outnumber all ordinary stars. B) Brown dwarfs would be responsible for most of the overall luminosity of our Milky Way Galaxy. C) Brown dwarfs would be extremely rare. D) Most of the brown dwarfs in the Milky Way Galaxy would be quite young in age.