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 gravitational force exerted by the sun on sphere 1 to the pressure of solar radiation on sphere 1 is T1; the ratio for sphere 2 is T2 . The ratio of T2 to T1 is
a. 0.25.
b. 0.50.
c. 1.0.
d. 2.0.
e. 4.0.
C
Physics & Space Science
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The antiparticle of the electron is called the ______________
Fill in the blank(s) with correct word
Physics & Space Science
If a 22 
resistor has a current of 2.0 A flowing through it, what is the potential difference across it?
A. 0.091 V B. 44 V C. 11 V D. 24 V E. 20 V
Physics & Space Science
Consider two copper wires. One has twice the length of the other. How do the resistances of these two wires compare?
A) Both wires have the same resistance. B) The longer wire has half the resistance of the shorter wire. C) The longer wire has twice the resistance of the shorter wire. D) none of the given answers
Physics & Space Science
The colors on an oil slick are caused by reflection and
A) diffraction. B) interference. C) refraction. D) polarization. E) ionization.
Physics & Space Science