Equilibrium: The mobile shown in the figure is perfectly balanced, and the horizontal supports have insignificant masses. What must be the masses of the suspended objects m1, m2, and m3 to maintain balance?
What will be an ideal response?
m1 = 1 g, m2 = 2 g, and m3 = 4 g
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If two equipotent planes differ in potential by 1.0 volt, and the electric field between them is 20 N/C, what is the separation of the planes?
A. 20 cm B. 0.050 cm C. 5.0 cm D. 2.0 cm E. 4.0 cm
The Copernican system was no more accurate than the Ptolemaic system in predicting the positions of the planets because ___________just as in the Ptolemaic system
a. the Copernican system assumed the Earth was at rest at the center. b. the Copernican system used elliptical planetary orbits c. the Copernican system used uniform circular motion. d. the Copernican system assumed all planets orbited the Sun
A wave disturbance in which the displacement in the medium is parallel to the direction of travel of the wave is a
A. longitudinal wave B. transverse wave
Which one of the following properties of light is evidence of the wave nature of light?
A) Reflection of light B) Refraction of light C) Emission of light D) Dispersion of light E) Interference of light