Why were Galileo's telescopic observations of the phases of Venus critical evidence in favor of the Copernican theory?
What will be an ideal response?
Galileo observed that Venus goes through phases like those of the Moon. This supported the Copernican model that the planets, like Venus, revolve around the Sun. The Ptolemaic model could not explain Venus's phases.
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Potential of Point-Charges: Two very small +3.00-?C charges are at the ends of a meter stick. Find the electric potential (relative to infinity) at the center of the meter stick. (k = 1/4??0 = 8.99 × 109 N ? m2/C2)
A. 0.00 V B. 2.70 × 104 V C. 5.40 × 104 V D. 1.08 × 105 V
Why do we think the first generation of stars would be different from stars born today?
A) Without heavy elements, the clouds could not reach as low a temperature as today and had to be more massive to collapse. B) Without heavy elements, the nuclear reactions at the center of the stars would be very different. C) Without heavy elements, there was no dust in the clouds and they collapsed faster. D) The Universe was much denser when the first stars were born. E) There were no galaxies when the first stars were born.
When current reverses direction in a wire, the surrounding magnetic field
A) also reverses direction. B) becomes momentarily stronger. C) contracts. D) expands.
Light of wavelength 687 nm is incident on a single slit 0.75 mm wide
At what distance from the slit should a screen be placed if the second dark fringe in the diffraction pattern is to be 1.7 mm from the center of the diffraction pattern? A) 0.39 m B) 1.9 m C) 1.1 m D) 0.93 m E) 0.47 m