Two identical silver spheres of mass m and radius r are placed a distance R (sphere 1) and 2R (sphere 2) from the sun respectively. The ratio of the pressure of solar radiation on sphere 2 to that on sphere 1 is
a. 0.25.
b. 0.50.
c. 1.0.
d. 2.0.
e. 4.0.
a
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Fraud in science is rare because it is difficult to commit. Why is it difficult to commit fraud in science?
a. Science requires that experimental and theoretical findings be reproducible. b. All scientists are bound by a code of ethics preventing them from publishing fraudulent work. c. Scientific results are reviewed by other scientists before they are published. d. Scientific journals only allow certain highly trusted individuals to publish their work. e. Science requires that experimental and theoretical findings be reproducible and scientific results are reviewed by other scientists before they are published.
If the vectors 
and 
have magnitudes of 10 and 11, respectively, and the scalar product of these two vectors is ?100, what is the magnitude of the sum of these two vectors?
A. 6.6 B. 4.6 C. 8.3 D. 9.8 E. 7.6
The output of a generator is 440 V at 20 A. It is to be transmitted on a line with resistance of 0.60 ?
To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power? A) 4.4 kV B) 7.3 kV C) 22 kV D) 30 kW E) 45 kV
A 3rd magnitude star appears 2.5 times brighter than a 4th magnitude star
Indicate whether the statement is true or false