A figure skater with arms initially extended starts spinning on the ice at 3 rad/s. She then pulls her arms in close to her body. Which of the following results?
a. a smaller rotational rate
c. a greater angular momentum
b. a greater rotational rate
d. a smaller angular momentum
B
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The Solar System is located about ________ from the center of the Milky Way.
A. 8 light-years B. 8 kiloparsecs C. 8 parsecs D. 8 AU
A person can see well in the distance, but cannot do so at an arm's-length distance. To correct this, lenses that are ________ having a ________ power could be used
a. thicker at their center than at the edges, positive b. thicker at their center than at the edges, negative c. thinner at their center than at the edges, positive d. thinner at their center than at the edges, negative
_________________ have the highest electrical conductivity at room temperature.
(a) Metals (b) Semiconductors (c) Insulators (d) Superconductors
Even though Venus is almost the same size as the Earth it does not have plate tectonics. This is most likely because
A) it has cooled more rapidly so that there is not enough internal convection to break up its crust B) it has no oceans for subduction and seafloor spreading to occur in C) due to the high temperatures at its surface, its crust has dried up and thickened so it cannot break up into plates D) impacts have filled its plate boundaries essentially turning the process off