An electron moving in the positive x direction experiences a magnetic force in the positive z direction. If Bx = 0, what is the direction of the magnetic field?
A. negative y direction
B. positive y direction
C. negative z direction
D. positive z direction
E. negative x direction
Answer: A
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Venus's extremely high surface temperatures are due to
A. a recent impact that heated the planet. B. the composition of its atmosphere. C. volcanic activity. D. its relatively close proximity to the Sun.
A rigid rod of length l rotates about an axis perpendicular to the rod, with one end of the rod fixed to the axis. Which of the following are equal at all points on the rod? I.the angular position II.the angular velocity III.the angular acceleration IV.the centripetal acceleration V.the tangential acceleration
A. I and II B. I, II, and III C. I, II, III and IV D. I, II, III, IV and V E. I, II and IV.
An optical fiber is made with core material of index of refraction 1.30 . The fiber is clad with a material of index 1.50 . What is the critical angle for this fiber?
a. 53.1° b. 56.4° c. 60.1° d. With these indices, there is not critical angle.
A CD has a diameter of 12.0 cm. If the CD starts from rest and has a constant angular acceleration of 2.00 
then the centripetal acceleration of a point 3.00 cm from the center of the CD after 3.00 sec is
A. 0.950 
B. 1.08
C. 1.25
D. 1.58
E. 1.83