If sunlight of color B is scattered through an angle 16 times greater than sunlight of color A, then the wavelength of color B is
A) twice that of color A.
B) 1/2 that of color A.
C) 16 times that of color A.
D) 1/16 that of color A.
E) 1/4 that of color A.
B
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In the Ptolemaic model, retrograde motion is due to
A) relative motion between the Earth and another planet in its orbit B) the Earth reversing the direction of its orbit about the Sun C) a planet moving backwards in its smaller circular circle, the center of which moves in a larger circular orbit around the Earth D) a planet reversing the direction of its orbit about the Sun
A -4.0-?C charge is situated at the origin of an xy-coordinate system. Another -4.0 ?C charge is at y = 4.0 m. What is the electric potential at a point x = 3.0 m due to these two charges?
A) -3600 V B) 3600 V C) -4800 V D) 4800 V E) 0 V
Work: A child does 350 J of work while pulling a box from the ground up to his tree house at a steady speed with a light rope. The tree house is 4.0 m above the ground. What is the mass of the box?
A. 8.9 kg B. 5.3 kg C. 6.7 kg D. 8.0 kg
A quantity that is measured in ohms is
a. voltage. b. current. c. resistance. d. electric field. e. critical temperature.