A 5.00 kg mass is located at (2.00 m, 0.00 m, 0.00 m) and a 3.00 kg mass is located at (0.00 m, 4.00 m, 0.00 m). The center of gravity of the system of masses is
A. (1.25 m, 1.25 m, 0).
B. (1.50 m, 1.50 m, 0).
C. (1.25 m, 1.50 m, 0).
D. (1.50 m, 1.25 m, 0).
E. (1.00 m, 1.00 m, 0).
C. (1.25 m, 1.50 m, 0).
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A space station of diameter 80 m is turning about its axis at a constant rate. If the acceleration of the outer rim of the station is 2.5 m/s2, what is the period of revolution of the space station?
a. 22 s b. 19 s c. 25 s d. 28 s e. 40 s
One sometimes hears reference to a "20-kiloton" bomb. What does this mean?
A) It means 20,000 tons of nuclear explosive is used in the bomb. B) It means that the number of "fissile" nuclei is equal to the number of trinitrotoluene molecules in 20,000 tons of TNT explosive. C) It means that the total weight of the bomb (not just the uranium) is 20,000 tons. D) It means that the energy released by the bomb is equal to the energy released when 20,000 tons of TNT is exploded. E) This refers to the maximum pressure generated by the bomb when it explodes.
Hubble divided the spiral galaxies up in what six subtypes?
What will be an ideal response?
When someone on Earth observes the Moon in the first-quarter phase, someone on the Moon facing Earth observes Earth in the
A) crescent Earth phase. B) third-quarter Earth phase. C) new Earth phase. D) first-quarter Earth phase. E) full Earth phase.