State the Equivalence of Physical Laws postulate of special relativity
What will be an ideal response?
The laws of physics are the same in all inertial frames of reference.
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A variable resistor has a voltage of 12.0 V placed across it. If the resistance is increased 20%, what happens to the current through it?
A. it increases 20% B. it increases 25% C. it decreases 20% D. it decreases 25% E. it decreases 17%
The Carnot engine is important because
A. it was historically the first practical heat engine. B. it shows (in principle) how one can use ideal gas processes to create a perfectly efficient engine. C. it shows (in principle) how one can use ideal gas processes to create a maximally efficient engine. D. it is the only engine that one can run in reverse as a refrigerator. E. some other reason (specify).
At an instant when a particle of mass 80 g has a velocity of 25 m/s in the positive y direction, a 75-g particle has a velocity of 20 m/s in the positive x direction. What is the speed of the center of mass of this two-particle system at this instant?
A. 16 m/s B. 45 m/s C. 23 m/s D. 20 m/s E. 36 m/s
An ideal gas is allowed to undergo a free expansion. If its initial volume is V1 and its final volume is V2, the change in entropy is
a. nR ln (V2/V1) b. nRT ln (V2/V1) c. nk ln (V2/V1) d. 0 e. nR V2/V1