The Earth's magnetosphere is a
A) sphere of magnetism found just outside the molten outer core of the Earth
B) spherical magnetic field generated by magnetic rocks on the Earth's surface
C) cavity carved out in the solar wind by the Earth's magnetic field
D) sphere of magnetism caused by the motion of charged particles in the Earth's outer atmosphere
C
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In Ptolemy's view of the universe, a planet moves on an epicycle whose center moves around the Earth on the deferent circle
a. Correct b. FALSE; Ptolemy put the Sun at the center. c. FALSE; The planet stays on the deferent circle. d. FALSE; The Earth is at the center of the epicycle. e. FALSE; Both c and d are correct.
A uniformly charged rod (length = 2.0 m, charge per unit length = 3.0 nC/m) is bent to form a semicircle. What is the magnitude of the electric field at the center of the circle?
A. 64 N/C B. 133 N/C C. 48 N/C D. 85 N/C E. 34 N/C
Over the last century, global average temperatures have
A) risen by about 0.85°C (1.5°F) B) stayed approximately constant C) risen by about 2.0°C (3.6°F) D) risen by about 3.0°C (5.4°F)
A wire, 6.0 m long, with a mass of 10 g, is under tension. A transverse wave is propagated on the wire, for which the frequency is 280 Hz, the wavelength is 0.60 m, and the amplitude is 8.4 mm
The time, for a crest of the transverse wave to travel the length of the wire, in ms, is closest to: A) 36 B) 31 C) 40 D) 44 E) 49