If the distance between two charged objects and the charge on each of them are all doubled, the electric force by either one on the other is
A) reduced to one-quarter of the original force.
B) doubled.
C) quadrupled.
D) halved.
E) unchanged.
E
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A) one at rest B) one moving at constant velocity C) one in mechanical equilibrium D) all of the above E) none of the above
A helium-filled weather balloon has a 0.90-m radius at liftoff where air pressure is 1.0 atm and the temperature is 298 K. When airborne, the temperature is 210 K, and its radius expands to 3.5 m. What is the pressure at the airborne location?
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What is maximum number 150 W light bulbs that can run on a 130 V circuit protected by a 20 amp circuit breaker?
A. 18 B. 16 C. 17 D. 15
For wood and concrete in contact and thermal conducting, determine the temperature profile through the materials using graphical techniques.
