A person has his nearsightedness corrected by lenses of -5.00 D. Without his glasses, his near point was 12.5 cm. With his glasses on, what is his near point? Assume the lenses are very close to eyes.
A. 13.0 cm
B. 20.0 cm
C. 33.0 cm
D. 17.5 cm
E. 7.50 cm
C. 33.0 cm
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Which of the following would be true about solar eclipses if the Moon's orbital plane was exactly aligned with the ecliptic plane?
A) Solar eclipses would be rarer. B) Solar eclipses would occur more often. C) Solar eclipses would last much longer. D) Solar eclipses would be both rarer and would last much longer. E) Solar eclipses would both occur more often and would last much longer.
An important reason for using a very large diameter objective in an astronomical telescope is
A) to increase the magnification. B) to increase the resolution. C) to form a virtual image, which is easier to look at. D) to increase the width of the field of view. E) to increase the depth of the field of view.
In science, an educated guess is a
A) hypothesis. B) theory. C) both
A heat pump absorbs heat from the atmosphere at a rate of 30 kW. If work is being done to run this heat pump at a rate of 7.7 kW, what is the coefficient of performance (COP) of the heat pump?
A) 22 B) 0.26 C) 2.9 D) 4.9 E) 3.9