An object 20-cm high is placed 50.0 cm in front of a lens whose focal length is 5.00 cm. Where will the image be located (in cm)?
A. 5.13
B. 5.56
C. 5.72
D. 5.93
E. 4.55
Answer: B
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Suggest a surface cooling rate to achieve a hardness of Rockwell C 55 instead of 59, referring to Figure 3-23 and Figure 3-23b.
FIG 3-23
Jominy end-quench test
During the period of one day, the number of high tides at a given point is about
a. one. b. two. c. three. d. four. e. none of the above.
Simple Harmonic Motion: If the frequency of the motion of a simple harmonic oscillator is doubled, by what factor does the maximum speed of the oscillator change?
A. 2 B. 4 C. It does not change. D. 1/2 E. 1/4
Satellite Motion: Suppose NASA wants a satellite to revolve around Earth 5 times a day. What should be the radius of its orbit if we neglect the presence of the Moon? (G = 6.67 × 10-11 N ? m2/kg2, Mearth = 5.97 × 1024 kg)
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