Earth's magnetism arises from
A) charged particles at rest on Earth's surface and on clouds in the lower atmosphere.
B) the Wizard of Oz.
C) electric currents in Earth's interior.
D) electric currents in the sun.
E) electric currents in the upper atmosphere.
C
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An Earth satellite in an elliptical orbit travels fastest when it is
A) nearest the Earth. B) farthest from the Earth. C) neither of these
At a location that is 3.00 m from wave source A and 4.20 m from wave source B, constructive interference occurs. Source A and source B are coherent and in phase
What is the maximum wavelength of the waves? A) 2.40 m B) 12.6 m C) 0.60 m D) 1.20 m E) There is no maximum wavelength.
The Rankine temperature scale has Fahrenheit degrees and a zero point at absolute zero. What is the Fahrenheit temperature of 62 Rankine?
a. –397.7 °F b. 111.6 °F c. 211.2 °F d. –238.7 °F
An unusual lightning strike has a vertical portion with a positive current of +400 A upwards. The Earth's magnetic field at that location is parallel to the ground and has a magnitude of 30 ?T. In N, the force exerted by the Earth's magnetic field on the 25 m-long current is
a. 0. b. 0.012 N, East. c. 0.012 N, West. d. 0.30 N, West. e. 300 N, East.