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
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?
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.