A farsighted boy has a near point at 2.3 m and requires contact lenses to correct his vision to the normal near point. What is the correct choice of lens power for the contact lenses?
A) -0.28 diopters
B) +0.28 diopters
C) -3.6 diopters
D) +3.6 diopters
E) +1.8 diopters
D
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While we can't completely rule out a connection between the sunspot cycle and weather cycles on Earth, most scientists doubt there is a significant effect because
A) the Sun's luminosity changes less than about 0.1% between minimum and maximums of the sunspot cycle. B) the Sun is too far away to affect Earth's weather. C) there are no known cycles in weather or climate that last as long as the sunspot cycle. D) sunspots are linked to the Sun's magnetic field, which could not possibly have any effect on Earth.
All of the following are true. Which of these gives evidence that quasars were more common in the early stages of the universe?
A) They are more common at very great distances. B) They are very bright. C) They are active galactic nuclei. D) We don't see them in every galaxy.
All forms of energy are equivalent in terms of doing useful work
What will be an ideal response?
A charge Q is uniformly distributed throughout a nonconducting sphere of radius R. The charge density in the sphere is
What will be an ideal response?