How large is an impact crater compared to the size of the impactor?
A) the same size
B) 10-20 percent larger
C) 10 times larger
D) 100 times larger
E) 1,000 times larger
C
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The largest share of renewable energy in the U.S. comes from
a. wind b. natural gas c. hydro d. petroleum e. radiant solar
A string is stretched with a tension of 120 N. The string has a length of 2.5 meters. The velocity of wave propagation along the string is 220 m/s. The mass per unit length of the string is
a. 
b. 
c. 
d. 
e. 
A popular end for many cartoon characters is to fall into a "bottomless pit" in which the unfortunate character will fall forever. Consider the space shuttle in orbit around the Earth
Argue that there is a strong analogy between the cartoon "bottomless pit" and the orbital motion of the shuttle.
What condition or conditions is/are necessary for static equilibrium?
A) ?Fy = 0 B) ?Fx = 0, ?Fy = 0 C) ?? = 0 D) ?Fx = 0 E) ?Fx = 0, ?Fy = 0, ?? = 0