As an object moves from point A to point B only two forces act on it: one force is conservative and does ?70 J of work, the other force is nonconservative and does +50 J of work. Between A and B,
a. the kinetic energy of object increases, mechanical energy increases.
b. the kinetic energy of object decreases, mechanical energy increases.
c. the kinetic energy of object decreases, mechanical energy decreases.
d. the kinetic energy of object increases, mechanical energy decreases.
e. None of the above.
b
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A battery charges a parallel-plate capacitor fully and then is removed. The plates are immediately pulled apart. (With the battery disconnected, the amount of charge on the plates remains constant
) What happens to the potential difference between the plates as they are being separated? A) It decreases. B) It increases. C) It remains constant. D) There is no way to tell from the information given.
Which of the following planets can be in opposition?
a. Mercury b. Venus c. Earth d. Uranus
A 4.00 kg solid sphere of radius 5.00 cm starts from rest and rolls without slipping down a 30.0 degree incline. The acceleration of the center of mass of the solid sphere is
A. 1.50 
B. 2.00
C. 2.50
D. 3.00
E. 3.50
If you walk 5.0 m horizontally forward at a constant velocity carrying a 10 N object, the amount of work you do is
A) more than 50 J. B) equal to 50 J. C) less than 50 J, but more than 0 J. D) zero.