If energy is released when the parts of a system are allowed to disperse to infinity, its binding energy is
A. Positive.
B. Negative.
C. Zero.
D. Not defined in such a case.
B. Negative.
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Why does Mars have more extreme seasons than Earth?
A) because it is farther from the Sun B) because it has a larger axis tilt C) because it has a more elliptical orbit D) because it has more carbon dioxide in its atmosphere
Which term identifies the defect where the lens produces a line image of a point source?
a. myopia b. presbyopia c. hyperopia d. astigmatism
The near point of a farsighted person is 100 cm. She places reading glasses very close to her eyes, and with them she can comfortably read a book at a distance of 25 cm. What is the power of the lenses in her reading glasses?
A) +2.5 diopters B) +3.0 diopters C) +3.2 diopters D) -2.0 diopters
A rock is suspended from a scale reads 20.0 N. A beaker of water (having a density of 1000 kg/m3 ) is raised up so the rock is totally submerged in the water. The scale now reads 12.5 N. What is the density of the rock?
A) 2.50 × 103 kg/m3 B) 3.00 × 103 kg/m3 C) 1.60 × 103 kg/m3 D) 2.67 × 103 kg/m3 E) 2.33 × 103 kg/m3