If both the mass and the velocity of a ball are tripled, the kinetic energy is increased by a factor of
A) 18.
B) 81.
C) 6.
D) 9.
E) 27.
E
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For an edge dislocation, the Burger’s vector is _____________to the dislocation line.
Fill in the blank(s) with the appropriate word(s).
Applications to Astronomy: The sun has apparent brightness B at the earth, which is 1.5 × 108 km away. What would be the apparent brightness of the sun at Pluto, which is 6.0 × 109 km from the sun?
A. 0.25 B B. 0.063 B C. 0.025 B D. 0.00063 B
Oxygen has atomic number 8. How many times must an oxygen atom be ionized to create an O+5 ion, and how many electrons will the ion have?
A) It must be ionized three times; it now has five electrons. B) It must be ionized five times; it now has five electrons. C) It must be ionized five times; it now has three electrons. D) It doesn't have to be ionized; it just needs to gain five protons. E) It doesn't have to be ionized; it already has only three electrons.
Suppose an astronomer proposed to build a major observatory on the campus of your school. Would it make a good observing site? Explain why or why not
What will be an ideal response?