When you stand in front of a convex mirror, the image you see is
a. real and inverted.
b. real and upright.
c. virtual and inverted.
d. virtual and upright.
e. real and inverted if your distance from the mirror is greater than two focal lengths.
d
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Suppose you look at a star that can be seen through the edge of a dusty interstellar cloud. The star will look ________ than it would if it were outside the cloud.
A) dimmer and redder B) dimmer and bluer C) more redshifted D) brighter and redder
Which of the following factors in the simplified Drake equation is best known?
A) Nhp, the number of habitable planets in our galaxy B) fciv, fraction of life-bearing planets where intelligent civilizations have arisen at any time C) fnow, fraction of civilization-bearing planets that have intelligent civilizations on them now D) flife, fraction of life-bearing habitable planets
A 60.0-Hz AC generator with a peak voltage of 110 V drives a series RC circuit with R = 10.0 ? and C = 300 ?F. The impedance is
a. 4.68 ?. b. 8.84 ?. c. 10.0 ?. d. 13.4 ?. e. 18.8 ?.
A 60.0-Hz AC generator with a peak voltage of 110 V drives a series RC circuit with R = 10.0 ? and C = 300 ?F. The power factor, cos ?, is
a. ?1.00. b. ?0.749. c. +0.749. d. +0.834. e. +1.00.