Instantaneous speed and average speed are equal
a. always
b. for motion at constant speed
c. for accelerated motion
d. never
B
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The rate of heat loss of a planet is proportional to its _______________, thus the smaller the world, the faster it is for heat to escape
Fill in the blank(s) with correct word
An uncharged conductor has a hollow cavity inside of it. Within this cavity there is a charge of +10 µC that does not touch the conductor. There are no other charges in the vicinity. Which statement about this conductor is true?
(There may be more than one correct choice.) A) The inner surface of the conductor carries a charge of -10 µC and its outer surface carries no excess charge. B) The inner and outer surfaces of the conductor each contain charges of -5 µC. C) The net electric field within the material of the conductor points away from the +10 µC charge. D) The outer surface of the conductor contains +10 µC of charge and the inner surface contains -10 µC. E) Both surfaces of the conductor carry no excess charge because the conductor is uncharged.
In a region of space where the magnetic field of the earth has a magnitude of 80 mT and is directed 30° below the horizontal, a 50-cm length of wire oriented horizontally along an east-west direction is moved horizontally to the south with a speed of 20 m/s. What is the magnitude of the induced potential difference between the ends of this wire?
a. 0.45 mV b. 0.35 mV c. 0.30 mV d. 0.40 mV e. 0.69 mV
A solid aluminum cube rests on a wooden table in a region where a uniform external electric field is directed straight upward. What can we say concerning the charge on the top surface of the cube?
A) The top surface is neutral. B) The top surface is charged negatively. C) The top surface is charged positively. D) The top surface's charge cannot be determined without further information.