Lenz's Law: As shown in the figure, a metal bar is in contact with a pair of parallel rails. A steady, uniform, magnetic field B is present directed to the right. The bar is moving upward with velocity of magnitude ?. What is the polarity of the induced emf in terminals X and Y?
A. X and Y are at the same potential.
B. X is positive and Y is negative.
C. Y is positive and X is negative.
Answer: A
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From the dimensions of Ida and its general features, one can estimate the mass of Ida to be 4.5 × 1016 kg, and the distance between Dactyl and Ida is approximately 90 km. Assuming a circular orbit, what would be the orbital speed of Dactyl? (G = 6.67 × 10-11 N ? m2/kg2 ) A) 2.9 m/s B) 5.8 m/s C) 30 m/s D) 11 m/s E) 2.3 m/s
The colors of objects we see by reflected light are due to
a. interference. b. selective absorption. c. specular reflection. d. diffuse reflection.
You see colors in a rainbow because of
a. interference. b. diffraction. c. specular reflection. d. dispersion. e. polarization.
Rank the following compounds by solubility in water, from most soluble to least
1) CH3CH2OH 2) CH3OCH3 3) CH3CH2NH2 A) 1, 3, 2 B) 1, 2, 3 C) 3, 2, 1 D) 3, 1, 2 E) 2, 1, 3