A conducting rod slides at 3.0 m/s on metal rails separated by 2.0 m. The 0.66 m T magnetic field is into the paper. If the resistance is 220 m
what is the current in the circuit?
A. 18 mA
B. 9.0 mA
C. 87
A
D. 3.0
A
E. 4.5 mA
A. 18 mA
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Hypothetically, if Planck's constant were smaller, atoms would be
A) larger. B) smaller. C) no different in physical size.
The force of gravity on a bowling ball rolling along a horizontal surface doesn't change its speed because the force is
A) small compared to the ball's weight. B) canceled by the normal force. C) perpendicular to its direction of motion. D) canceled by friction.
You are inside a jet plane moving at a constant velocity. You toss a rock straight up in the air, and then you keep your hand at the point of release. The rock comes down in your hand. This example illustrates
A) that light is a wave. B) the Michelson-Morley experiment. C) the principle of relativity. D) the principle of the constancy of lightspeed. E) that moving clocks go slow.
White light is sent through a prism, and the various colors are separated in typical fashion. Which of the following colors would have the highest index of refraction in this prism?
a. green c. blue b. red d. yellow