The figure shows a cross section of three parallel wires each carrying a current of 20 A. The currents in wires A and B are out of the paper, while that in wire C is into the paper. If the distance R = 5.0 mm, what is the magnitude of the force on a 2.0-m length of wire A?
a.
23 mN
b.
64 mN
c.
32 mN
d.
46 mN
e.
55 mN
c
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Look carefully at this map and the two labeled paths from Philadelphia to Beijing. Which statement is true?
A) The map is fine, and the distances seem backward only because it is a flat map of a round Earth. B) The distances on the two paths are labeled backward; the curved one should be the longer one. C) The upper curved path makes sense only if we assume that it is a path that is drilled through the center of our planet. D) The routes shown are impossible because there can be only one correct distance between two cities.
The sound level at 1.0 m from a certain talking person talking is 60 dB. You are surrounded by five such people, all 1.0 m from you and all talking equally loud at the same time
The threshold of hearing is 1.0 × 10-12 W/m2. What sound level are you being exposed to? You can neglect any absorption, reflection, or interference of the sound. The threshold of hearing is 1.0 × 10-12 W/m2. A) 300 dB B) 60 dB C) 74 dB D) 67 dB E) 81 dB
Geologists view the part of our planet that is called the ______________ as consisting of a number of close-fitting plates
a. mesosphere b. lithosphere c. asthenosphere d. none of these
An object of mass 1.00 kg is attached to a vertical spring with spring constant 100 N/m. The object is held at rest in a position such that the spring is stretched upward a distance 1.00 cm beyond its undisturbed length
If the object is released, how far will it drop before coming to rest? A) 2.06 cm B) 2.00 cm C) 2.94 cm D) 3.06 cm E) 1.94 cm