Two carbon cylinders have radii r and 2r and the first has length 2L, while the second has length L. What is the resistance of the first if the resistance of the second is 12 
A. 6
B. 1.5
C. 3
D. 24
E. 96
F. 48
E. 96
Physics & Space Science
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_________is the increase in conductivity that results when photons excite electrons in a semiconductor or insulator into the conduction band.
Fill in the blank(s) with the appropriate word(s).
Physics & Space Science
The first law of thermodynamics is a restatement of the conservation of
A) momentum. B) energy. C) electric charge. D) all of the above E) none of the above
Physics & Space Science
If a virtual image is formed 8.00 cm along the principal axis from a convex mirror of focal length –15.0 cm, how far is the object from the mirror?
a. 30.0 cm c. 3.00 cm b. 6.00 cm d. 17.1 cm
Physics & Space Science
About how many stars does a globular cluster have?
A. About a dozen B. Hundreds C. Tens to hundreds of thousands D. Hundreds of millions E. Billions
Physics & Space Science