What is the focal length of the corrective contact lens needed by a nearsighted person whose far point is at 60 cm?
A) -60 cm B) +30 cm C) -30 cm D) +60 cm E) +130 cm
A
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Twelve hours of daytime and twelve hours of nighttime occur at every location on Earth whenever the Sun reaches the
a. north or south celestial pole. b. celestial prime meridian. c. vernal or autumnal equinox. d. ecliptic.
Light from Proxima Centauri takes _____ to reach Earth
A) 2 years B) 4.2 years C) 6 years D) 8.4 years
A proton, moving freely, has a wavelength of 0.600 pm
(a) What is its momentum? (b) What is its speed? (c) Through what potential difference might it have been accelerated through, from rest, to reach this speed?
As compared to Jack, Jill does twice the work in half the time. Jill's power output is
A) the same as Jack's power output. B) one-fourth as much as Jack's power output. C) one-half as much as Jack's power output. D) twice Jack's power output. E) four times Jack's power output.