In the critical universe now proposed, the ratio of matter/energy is about:
A) 50:50.
B) 27:73.
C) 75:25.
D) 10:90.
E) 95:5.
B
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A point charge Q is placed on the x axis at x = 2.0 m. A second point charge, ?Q, is placed at x = 3.0 m. If Q = 40 ?C, what is the magnitude of the electrostatic force on a 30-?C charge placed at the origin?
A. 7.2 N B. 3.9 N C. 1.5 N D. 14 N E. 8.1 N
The Lyman-alpha "forest" are absorption lines in a quasar spectrum created by all of the gases along the billions of light years its energy has traversed
Indicate whether the statement is true or false
Your weight is 120 lb. Suppose you are standing on a scale in an elevator moving up with a constant speed of 4 m/s. What would be the reading on the scale?
A. 30 lb. B. 0 C. 120 lb. D. 480 lb. E. 70 lb.
A spool of thread has an average radius of 1.00 cm. If the spool contains 126 m of thread, how many turns of thread are on the spool? "Average radius" allows us to not need to treat the layering of threads on lower layers
a. 100 c. 2000 b. 1000 d. 62,800