The deviation from the way a compass needle points from the true north direction is the
a. greenhouse effect
b. magnetic inclination
c. magnetic declination
d. magnetic resonance effect
e. none of the above
C
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Force on a Moving Charge: An electron moves with a speed of 8.0 × 106 m/s along the +x-axis. It enters a region where there is a magnetic field of 2.5 T, directed at an angle of 60° to the +x-axis and lying in the xy-plane. Calculate the magnitude of the acceleration of the electron. (e = 1.60 × 10-19 C, me1 = 9.11 × 10-31 kg)
A. 1.3 × 1018 m/s2 B. 3.0 × 1018 m/s2 C. 1.3 × 10-18 m/s2 D. 3.0 × 10-18 m/s2 E. 0 m/s2
A circus diver drops from a high pole into water far below. When he is half-way down
A) his potential energy is halved. B) he has gained an amount of kinetic energy equal to half his initial potential energy. C) his kinetic and potential energies are equal. D) all of the above E) none of the above
What is the shape of the segmented mirrors of twin Keck Observatory telescopes, Gran Telescopio Canarias, and soon to be launched James Web Space Telescope?
a. spherical b. hexagonal c. rectangular d. triangular e. octagonal
Which of the following landscapes were not carved by glaciers?
A) The Grand Canyon B) Yosemite National Park C) The Swiss Alps D) The Great Lakes of North America