Which of the following critical features of the heliocentric model leads to Venus exhibiting a full range of phases?
A) When Venus is closer to the Sun, it moves faster.
B) Venus passes on the far-side of the sun from the Earth's perspective.
C) Venus physically distorts from a sphere as it orbits the sun.
B
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What is the inductance for an inductor with a reactance of 20
at a frequency of 60 Hz?
A. 12 H B. 19 H C. 3.0 H D. 53 mH E. 27 mH
Single-Slit Diffraction: In a single-slit diffraction experiment, the width of the slit through which light passes is reduced. What happens to the width of the central bright fringe in the resulting diffraction pattern?
A. It stays the same. B. It becomes narrower. C. It becomes wider.
______ refers to the amount of vertical spacing between lines of text.
A. Leading B. Tracking C. Kerning D. Indenting
A solar heated house loses about 5.5 × 10^7 cal through its outer surfaces on a typical 24-h winter day. What mass of storage rock is needed to provide this amount of heat if it is brought up to initial temperature of 58°C by the solar collectors and the house is maintained at 23°C? (Specific heat of rock is 0.21 cal/g/°C.)
a. 1.4E+3 kg b. 7.5E+4 kg c. 7.5E+3 kg d. 7.5E+2 kg e. 1.6E+3 kg