When an electron passes through the magnetic field of a horseshoe magnet, the electron's
A) speed is increased.
B) direction is changed.
C) both of these
D) neither of these
Answer: B
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Huygens' principle applies mainly to
A) refraction of waves in a medium. B) reflection of waves. C) both of these D) neither of these
The escape velocity of an object depends on I. the mass of that object. II. the mass of the object trying to escape. III. the distance from the center of the object and the escaping object. IV. the speed of light
a. I, II, III, & IV b. I & II c. I & III d. I, II, & IV e. I, III, & IV
All RR Lyrae stars have about the same:
A) period of six hours. B) distance of 32 light years. C) galactic location and speed. D) luminosity of about 100 Suns. E) locations in the centers of globular star clusters.
A 10 pound iron ball and a 2 pound iron ball are dropped simultaneously from a height of 100 meters. Neglecting air resistance, which ball will reach the ground first?
A. They will reach the ground at the same time B. The 10 lb ball C. The 2 lb ball