An electron is moving at a speed of 12 × 10^6 m/s at an angle of 30° with respect to a uniform magnetic field of 8.0 × 10^–4 T. What is the radius of the resulting helical path? (me = 9.11 × 10^–31 kg, qe = 1.6 × 10^–19 C)
a. 2.1 cm
c. 4.3 cm
b. 3.7 cm
d. 8.5 cm
C
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Why can't the carbon dioxide cycle easily correct for the increasing amounts of carbon dioxide introduced into our atmosphere by industrialization?
A) it operates far too slowly to correct for any short-term changes B) pollution has stopped the carbon dioxide cycle from operating C) the carbon dioxide cycle only influences carbon dioxide produced by natural sources D) it operates far too quickly to correct for any short-term changes
Which of the following statements is not true of glaciers?
a. They cause little erosion. b. They are made of ice. c. They form when more snow falls than melts. d. They flow.
A CD has a diameter of 12.0 cm. If the CD starts from rest and has a constant angular acceleration of 2.0 
then the tangential velocity of a point 3.0 cm from the center of the CD after 3.0 sec is
A. 18 cm/s. B. 21 cm/s. C. 25 cm/s. D. 32 cm/s. E. 45 cm/s.
Galaxies have stars of varying ages, but the stars of elliptical galaxies are typically....
A. Population I. B. Population II. C. blue-white. D. contained in the spiral disk.