A high-resistance material is used as an insulator between the conductors of a length of coaxial cable. The resistance material, which forms a hollow tube, has an inner radius a and an outer radius b, and the insulator provides a resistance R between the conductors. If a second insulator, made of the same material and having the same length, is made with double both the inner radius and the outer
radius of the first, what resistance would it provide between the conductors?
a. R
b. 2 R
c. 4 R
d. (ln2)R
e. R/(ln2)
a
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In a reflecting telescope, the secondary mirror causes a hole in the center of the image.
Answer the following statement true (T) or false (F)
A brass rod of length L 5 0.75 m is twisted by torques T until the angle of rotation between the ends of the rod is 3.58. The allowable shear strain in the copper is 0.0005 rad. The maximum permissible diameter of the rod is approximately:
(A) 6.5 mm
(B) 8.6 mm
(C) 9.7 mm
(D) 12.3 mm
Without the strong nuclear force, the only element in the universe would be ________. Explain
Fill in the blank(s) with correct word
When an unstable Arsenic nucleus undergoes alpha decay, the nucleus formed is that of
a. Arsenic. b. Bromine. c. Germanium. d. Gallium. e. Selenium.