For an electron moving in a direction opposite to the electric field
A) its potential energy increases and its electric potential decreases.
B) its potential energy decreases and its electric potential increases.
C) its potential energy increases and its electric potential increases.
D) its potential energy decreases and its electric potential decreases.
E) both its potential energy and it electric potential remain constant.
B
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Velma passes Mort at a high speed. According to Mort, his clock has progressed by one hour while Velma's clock progressed by only 40 minutes. What does Velma observe?
A) Mort's clock progressed by one hour while Velma's clock progressed by 80 minutes. B) Mort's clock progressed by 40 minutes while Velma's clock progressed by one hour. C) Mort's clock progressed by one hour while Velma's progressed by 40 minutes. D) both clocks progressed by one hour. E) The answer cannot be determined, because we don't know Velma's speed.
The isotope 64Zn has a nuclear radius of 4.8 ×10-15 m. Which of the following is the mass number of an isotope for which the nuclear radius is 6.8 ×10-15 m?
a. 182 c. 145 b. 125 d. 96
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)
The work done by static friction can be:
a. positive. b. negative. c. zero. d. Any of the above.