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)
D. 0.23 J
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a. True b. False Indicate whether the statement is true or false
Force on a Wire: A wire in the shape of an "M" lies in the plane of the paper. It carries a current of 2.0 A, flowing from A to E, as shown in the figure. It is placed in a uniform magnetic field of 0.75 T in the same plane, directed as shown on the right side of the figure. The figure indicates the dimensions of the wire. Note that AB is parallel to DE and to the baseline from which the magnetic field direction is measured. What are the magnitude and direction of the force acting on section AB of this wire?
A. 0.20 N perpendicular out of the page B. 0.40 N perpendicular out of the page C. 0.11 N perpendicular out of the page D. 0.20 N perpendicular into the page E. 0.11 N perpendicular into the page
In the context of life in the universe, which of the following discoveries of astronomy suggests that enormous numbers of habitable worlds may exist in the universe?
A) the laws of physics are the same everywhere B) the universe is very old C) the universe is very large D) the building blocks of life are common
Consider a situation where two moving objects collide and rebound from each other. The energy of a ball rolling up an inclined plane
a. is entirely kinetic b. is entirely potential c. is both kinetic and potential d. none of the above