A 47.0-kg person steps on a scale in an elevator. The scale reads 461 N. What is the elevator doing?
What will be an ideal response?
It is either at rest or traveling with a constant velocity.
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The fact that most moons always show the same face to their planet is
A) very surprising and a great mystery. B) a natural consequence of the fact that the entire solar nebula rotated in the same direction. C) explained by the law of conservation of angular momentum. D) a natural consequence of tidal forces acting on the moons. E) a result of the fact that the moons once had atmospheres.
The power rating of a 400 ? resistor is 0.25 W. What is the maximum voltage?
A) 10 V B) 20 V C) 30 V D) 40 V E) 50 V
Materials in which the resistivity becomes essentially zero at very low temperatures are referred to as
A) conductors. B) insulators. C) semiconductors. D) superconductors.
Gluons
a. are carriers of the color force b. posses color charge c. can interact with each other via the color force d. can form glueballs e. all of the above