What is the focal length of a contact lens that will allow a person with a near point of 125 cm to read a physics book held 25.0 cm from his eyes?
A) -100 cm
B) -31.3 cm
C) 10.2 cm
D) 20.8 cm
E) 31.3 cm
E
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On a clear night when an observer in Los Angeles sees a first-quarter Moon, an observer in London would see
a. a full Moon. b. a first-quarter Moon. c. a new Moon. d. a third-quarter Moon. e. any of the other choices; it depends on the time of day.
The circuit below contains 5 identical light bulbs. The emf is 110 V. Which light bulb(s) is(are) brightest?
A. A: The one closest to the positive terminal of the battery. B. A and C: The bulbs closest to the positive terminal of the battery. C. A and B: Because they are closest to the terminals of the battery. D. C and D: Because they receive current from A and B and from E. E. E: Because the potential difference across E is that of the battery.
A 1000-kg barge is being towed by means of two horizontal cables. One cable is exerting a force of 80.0 N in a direction 30.0° west of north
In what direction should the second cable pull so that the barge will accelerate northward, if the force exerted by the cable is 120 N? Assume that the water exerts no appreciable frictional drag on the barge. A) 19.5° east of north B) 21.1° east of north C) 39.0° east of north D) 47.5° east of north E) 54.7° east of north
According to Lenz's law, the direction of an induced current in a conductor will be that which tends to produce which of the following effects?
A) enhance the effect which produces it B) produce a greater heating effect C) produce the greatest voltage D) produce the smallest voltage E) oppose the effect which produces it