You push your 2 kg physics book along a tabletop, pushing it with 10 newtons of force. The frictional force on it is 4 newtons. The book's acceleration is
A) 2 m/s2. B) 5 m/s2. C) zero. D) 3 m/s2. E) 0.2 m/s2.
D
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Consider the equipotential diagram shown in problem E3T.12. In the expression 
, what is the approximate value of b?
A. 8
B. 2
C. 0
D. 1/2
E. 1/8
F. Some other value (specify)
Seyfert galaxies are ________.
A. isolated black holes emitting radio waves B. bright elliptical galaxies C. spiral galaxies whose nucleus is abnormally luminous D. small irregular galaxies E. None of these choices is correct.
Work: A traveler pulls on a suitcase strap at an angle 36° above the horizontal. If 555 J of work are done by the strap while moving the suitcase a horizontal distance of 15 m, what is the tension in the strap?
A. 46 N B. 37 N C. 52 N D. 56 N
Which statement gives the relationship between the waves in the electric and magnetic fields in an electromagnetic wave?
A) They are in phase and parallel with each other in space. B) They are 90 degrees out of phase but parallel in space. C) They are in phase but perpendicular to each other in space. D) They are 180 degrees out of phase and random in their inclinations to each other. E) They are in phase but opposite in direction of motion.