Two long, straight wires cross each other at a right angle, and each carries the same current I (Fig. OQ30.5). Which of the following statements is true regarding the total magnetic field due to the two wires at the various points in the figure? More than one statement may be correct
1,3
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Which of the following numbers is the largest?
A) 23.62 × 108 B) 0.36 × 109 C) 4.35 × 1010 D) 0.056 × 1011
If the spiral density wave were the only thing producing spiral arms, it would be expected that
a. all spiral arms would be gas and dust free. b. all galaxies would have only two smooth spiral arms. c. the Milky Way would show and irregular pattern of short arms d. the Milky Way wouldn't have any spiral arms. e. the halo component of the Milky Way would show spiral arms as well.
An object of mass m and moment of inertia I has rotational kinetic energy KER. Its angular momentum is:
a. 0.5 I/m. c. (2 mKER)1/2. b. (2 IKER)1/2. d. not given.
Which of the following is NOT an example of a psychographic characteristic?
A. social group affiliations B. educational level C. lifestyle choices D. political affiliations