The cosmic background radiation appears compatible with a blackbody source at what temperature?
a. 0.0003 K
c. 300 K
b. 3 K
d. 0.03 K
B
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All planets in the solar system orbit counterclockwise as seen from the north
a. True b. False Indicate whether the statement is true or false
A bimetallic beam of aluminum (Ea 5 70 GPa) and copper (Ec 5 110 GPa) strips has a width of b 5 25 mm; each strip has a thickness of t 5 1.5 mm. A bending moment of 1.75 N?m is applied about the z axis. The ratio of the maximum stress in aluminum to that in copper is approximately:
(A) 0.6
(B) 0.8
(C) 1.0
(D) 1.5
According to the universal law of gravitation, if you triple the distance between two objects, then the gravitational force between them
A) decreases by a factor of 9. B) increases by a factor of 9. C) decreases by a factor of 3. D) increases by a factor of 3.
In a vacuum the speed of light waves compared to the speed of radio waves is
A. faster B. slower C. the same