Thin Lenses: How far from a lens having a focal length of +50 mm must the object be placed if it is to form a virtual image that is 3.0 times the size of the object?
A. 33 mm
B. 42 mm
C. 48 mm
D. 54 mm
Answer: A
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Conservation of Momentum: A rocket explodes into two fragments, one 25 times heavier than the other. The magnitude of the momentum change of the lighter fragment is
A. 25 times as great as the momentum change of the heavier fragment. B. The same as the momentum change of the heavier fragment. C. 1/25 as great as the momentum change of the heavier fragment. D. 5 times as great as the momentum change of the heavier fragment. E. 1/4 as great as the momentum change of the heavier fragment.
What kind of reactor produces more fissionable fuel than it consumes?
A) AOLA B) LOCA C) moderated D) heavy water E) breeder
The dedicated third wire on a 3-prong plug is connected to
A) ground. B) a fuse. C) a ground fault interrupter. D) the "hot" wire.
The reason that most extrasolar planets discovered by the transit technique are found close to their parent stars is
A) the closer to a star, the hotter and therefore brighter the planet is. B) they transit more frequently, and have thus been more likely to be detected in the short time we have been searching for them. C) the wavelength shift of the star's spectrum is larger. D) planets that are close to a star are heated up and therefore larger. E) more of the starlight is blocked by the planet when it transits the star.