A resistor R is connected across a battery of negligible internal resistance. If the resistance of R is cut in half, the power dissipated in R will ________ (indicate change, if any).
Fill in the blank(s) with the appropriate word(s).
increase
double
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A newly formed protostar will radiate primarily at which wavelength?
A) visible light B) X-ray C) infrared D) ultraviolet E) radio
How is a rock defined?
A 40-kg boy is standing on the edge of a stationary 30-kg circular platform that is free to rotate. The boy tries to walk around the platform in a counterclockwise direction. As he does:
a. the platform doesn't rotate. b. the platform rotates in a clockwise direction just fast enough so that the boy remains stationary relative to the ground. c. the platform rotates in a clockwise direction while the boy goes around in a counterclockwise direction relative to the ground. d. both go around with equal angular velocities but in opposite directions.
Positive work can be done
a. by friction on the tires when a car is accelerating without skidding. b. by a spring when it launches a clown in the air. c. by a hand throwing a ball. d. by all of the above. e. only by (b) and (c) above.