Seismic waves are most useful for mapping
A) the surface of Mars with Global Surveyor.
B) the surface of Venus with Magellan.
C) the Earth's core and mantle.
D) the depths of the oceans.
E) the density of the hydrosphere.
C
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Three 1.0 
C charges are placed along the x-axis, one charge at x = -10 cm, another at the origin, and the last one at x = 10 cm. What is the total potential energy of this arrangement?
A. 0.27 J B. -0.27 J C. 0.72 J D. 0.23 J E. infinite (or indeterminate)
Meteor Crater in Arizona is about 1.2 kilometers across. According to the graph, about how big was the object that made this crater? (Note: Be sure to read the axis labels carefully.)
A) 1 meter B) 10 meters C) 100 meters D) 1 kilometer
If the net flux through a closed surface is zero, then there can be no charge or charges within that surface
Indicate whether the statement is true or false
A 12.0-kg mass is placed on a 29.0° incline and friction keeps it from sliding. The coefficient of static friction in this case is 0.660, and the coefficient of sliding friction is 0.546 . The mass is given a shove causing it to slide down the incline. What is the frictional force while the mass is sliding?
a. 57.0 N b. 102.9 N c. 56.2 N d. 67.9 N e. 10.5 N