The activation enthalpy for vacancy diffusion along a grain boundary is _____________than that for diffusion through the bulk.
Fill in the blank(s) with the appropriate word(s).
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William and Caroline Herschel's map included four of the following hypotheses in their model of the galaxy. Which one was the exception? a. They thought that the "holes in the sky" were caused by interstellar dust clouds. b. They proposed that the galaxy had a disk shape
c. They provided accurate measurements of the distances to stars. d. They placed the Sun in the center of the galaxy. e. They found errors caused by a lack of knowledge of the interstellar medium.
A pole-vaulter holds out a 5.5kg, 4.75m pole horizontally in front of him. Assuming the pole is uniform in construction, and that he holds the pole with one hand at the very end, and one hand 0.75m from the end, what is the torque applied by the Earth to the pole?
A. 40N B. 88N C. Not enough information is given D. 128N
Large interstellar clouds can collapse to form several stars approximately at the same time.
Answer the following statement true (T) or false (F)
Today, global average temperatures are estimated using
A) orbiting satellites B) weather stations C) water temperature measurements by ships D) all of these