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

Physics & Space Science

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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

Physics & Space Science

When an unstable Arsenic nucleus undergoes alpha decay, the nucleus formed is that of

a. Arsenic. b. Bromine. c. Germanium. d. Gallium. e. Selenium.

Physics & Space Science

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)

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Without the strong nuclear force, the only element in the universe would be ________. Explain

Fill in the blank(s) with correct word

Physics & Space Science