Three point charges, 
and
are located at the vertices of an equilateral triangle of side length 30 cm. What is the potential energy of this arrangement?
A. 0.24 J
B. 0.12 J
C. -0.24 J
D. -0.12 J
E. 0
E. 0
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Unpolarized light is passed through polarizer 1 . The light then goes though polarizer 2 with its plane of polarization at 35.8° to that of polarizer 1 . Polarizer 3 is placed after polarizer 2 . Polarizer 3 has its plane of polarization at 58.8° to the plane of polarization of polarizer 2 and at 94.6° to that of polarizer 1 . What fraction of the intensity of the original light gets though
the last polarizer? a. 0.177 b. 0.463 c. 0.232 d. 0.088 e. 0.021
The radio source ________ is located in a place consistent with the center of our Galaxy
A) Cygnus X-1 B) 3C 273 C) 47 Tucanae D) M-8, the Lagoon Nebula E) Sgr A?
A hydraulic jack has a mechanical advantage allowing a puny human to lift a car. Which of the following statements is true?
A. the input force is equal to the output force B. the area of the input piston is equal to the area of the output piston C. the distances the input and output pistons move are equal D. the work done by the output piston is equal to the work done on the input piston
A carbon dioxide molecule is
a. linear and polar. b. angular and polar. c. linear and nonpolar. d. angular and nonpolar.