The geocentric model was formulated before the heliocentric model.
a. true
b. false
True
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If the current flowing through a circuit of constant resistance is doubled, the power dissipated by that circuit will
A) quadruple in magnitude. B) double in magnitude. C) decrease to one-half of what it was. D) decrease to one-fourth of what it was.
"Spikes" seen in images of stars are caused by ________.
A. disruption from nearby light sources B. diffraction from the telescope support structures C. dispersion from the telescope's primary lens D. deflection from the inner surfaces of the telescope
A 3.0 cm tall statue is 48. cm in front of a biconvex lens (focal length 20. cm)
(a) Is the image real or virtual? (b) How far is the image from the lens? (c) Is the image upright or inverted? (d) How high is the image?
Phil Physiker standing at the edge of a cliff throws one ball straight up and another ball straight down, both with the same speed. Neglecting air resistance, which ball hits the ground below with the greater speed?
A) the one thrown upward B) the one thrown downward C) neither, both hit with the same speed