A motor scooter undergoes acceleration when it
A) gains speed.
B) decreases speed.
C) changes direction.
D) all of the above
Answer: D
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Where do scientists think that Jupiter's strong magnetic field is generated?
A) in its rocky core B) in its metallic hydrogen layer C) in its liquid hydrogen layer D) in its gaseous hydrogen layer E) above the cloudtops
Doubling only the spring constant of a vibrating mass-and-spring system produces what effect on the system's mechanical energy?
A) increases the energy by a factor of square root of two B) increases the energy by a factor of two C) increases the energy by a factor of three D) increases he energy by a factor of four E) produces no change
A parallel plate capacitor with circular plates having radius 0.07 m is used to store energy. If it is desired to store 
in this capacitor, what must the separation distance be for a voltage of 1.5 kV?
A. 0.64 cm B. 0.41 cm C. 2.5 cm D. 1.3 cm
A solid conducting sphere (radius = 5.0 cm) has a charge of 0.25 nC distributed uniformly on its surface. If point A is located at the center of the sphere and point B is 15 cm from the center, what is the magnitude of the electric potential difference between these two points?
a. 23 V b. 30 V c. 15 V d. 45 V e. 60 V