An object is 20.0 cm from the surface of a spherical Christmas tree ornament that is 8.00 cm in diameter. What is the magnification of the image?
a. – 0.091
b. – 0.545
c. + 0.091
d. + 0.545
e. + 0.364
c
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A 3.000 kg ball is pitched with a kinetic energy of 20.00 Joules. Then the momentum of the ball is
A. 7.500 kg m/s. B. 8.350 kg m/s. C. 9.450 kg m/s. D. 10.95 kg m/s. E. 12.50 kg m/s.
The normal mode of a resonating system is sinusoidally disturbed at a frequency . Assume that , where is the normal mode’s natural frequency. (a) What is the amplitude of the normal mode’s oscillation compared to its amplitude in the limit that the disturbance frequency goes to zero if is about 1.4 ?
A. Roughly zero
B. Roughly 
/30
C. Roughly /1.4
D. Roughly
E. Roughly 1.4
F. Roughly 30
T. Other (specify)
Which of the following explains why navigators prior to a few hundred years ago found it much more difficult to determine longitude than latitude?
A) Determining longitude requires mathematical techniques that were not known at the time. B) Determining longitude requires much more precise measurements of angles in the sky than does latitude. C) Determining longitude requires accurate tables of the celestial coordinates of stars, while determining latitude does not. D) Determining longitude requires an accurate clock, but latitude does not.
An initially uncharged parallel plate capacitor of capacitance C is charged to potential V by a battery. The battery is then disconnected. Which statement is correct?
a. There is no charge on either plate of the capacitor. b. The capacitor can be discharged by grounding any one of its two plates. c. Charge is distributed evenly over both the inner and outer surfaces of the plates. d. The magnitude of the electric field outside the space between the plates is approximately zero. e. The capacitance increases when the distance between the plates increases.