Rich galactic clusters ____
a. are rare, because galaxies are usually isolated in space
b. contain gas that is rich in metals
c. are composed of mostly elliptical galaxies
d. are very spread out, without a defined center
e. contain a wide variety of galaxy types and sizes
c
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Answer the following statement true (T) or false (F)
Charges q, q, and –q are placed on the x-axis at x = 0, x = 4 m, and x = 6 m, respectively. At which of the following points does the electric field have the greatest magnitude?
a. x = 3 m b. x = 5 m c. x = 8 m d. The electric field has the same magnitude at all three positions. e. x = 7 m
Three small masses are positioned at the following coordinates: 3.0 kg at (3.0 m, 2.0 m); 4.0 kg at (0.0 m, -1.0 m); and 5.0 kg at (5.0 m, -7.0 m). What are the coordinates of the center of mass (or center of gravity) of this system?
What will be an ideal response?
A long, vertical, metallic wire carries downward electric current. What would be the direction of the field if the current consisted of positive charges moving downward instead of electrons moving upward?
1.north 2.south 3.east 4.west 5.up