A 2.00 kg mass is located at (4.00 m, 0.00 m, 0.00 m) and a 4.00 kg mass is located at (0.00 m, 3.00 m, 0.00 m). The center of gravity of the system of masses is
A. (1.33 m, 2.00 m, 0).
B. (1.33 m, 1.00 m, 0).
C. (1.50 m, 1.33 m, 0).
D. (2.00 m, 1.33 m, 0).
E. (1.33 m, 1.50 m, 0).
A. (1.33 m, 2.00 m, 0).
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Suppose a uniform electric field of 4 N/C is in the positive x direction. When a charge is placed at and fixed to the origin, the resulting electric field on the x axis at x = 2 m becomes zero. What is the magnitude of the electric field at x = 4 m on the x axis at this time?
A. 0 B. 1 N/C C. 2 N/C D. 4 N/C E. More information is needed to find the resulting field magnitude at this position.
The observed relationship of 1/500 between the masses of central black holes and the bulge masses of galaxies implies that
A) the black hole will eventually suck in the rest of the galaxy. B) galaxy formation and supermassive black hole formation must be related somehow. C) the biggest galaxies have the most luminous quasars. D) quasars were more common 10 billion years ago than they are today.
The xy plane is "painted" with a uniform surface charge density which is equal to 40 nC/m2 . Consider a spherical surface with a 4.0-cm radius that has a point in the xy plane as its center. What is the electric flux through that part of the spherical surface for which z > 0?
a. 14 N × m2/C b. 11 N × m2/C c. 17 N × m2/C d. 20 N × m2/C e. 23 N × m2/C
A slide projector has a lens of focal length 150. mm. An image 100. cm × 100. cm is formed of a slide whose dimensions are 50.0 mm × 50.0 mm. How far from the lens must the screen be placed?
What will be an ideal response?