A circuit contains two inductors of 6.0-mH inductance in parallel placed in series with an inductor of 8.0-mH inductance. After one of the 6.0-mH inductors burns out, the repairman wants to replace all three inductors with one inductor of equivalent inductance. Assuming inductors combine in series and parallel the same way resistors do, what inductance should he use?
a. 3.0 mH
b. 3.4 mH
c. 4.8 mH
d. 11 mH
e. 20 mH
d
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In a Western movie, a person shoots an arrow backward from a fleeing horse. If the velocity of the horse relative to the ground is 13 m/s west and the arrow’s velocity relative to the horse is 38 m/s east, what is the arrow’s velocity with respect to the ground?
A. 41 m/s east B. 41 m/s west C. 25 m/s east D. 25 m/s west
An object of mass m rests on a flat table. The earth pulls on this object, exerting a force of magnitude mg. What is the Newton's third law pair force to this pull?
A) The table pushing up on the object exerting the force mg. B) The object pushing down on the table exerting the force mg. C) The table pushing down on the floor exerting the force mg. D) The object pulling upward on the Earth exerting the force mg. E) The table pulling upward on the Earth exerting the force mg.
Why do elliptical galaxies appear yellow or red?
A) They contain no hot, young blue stars B) They contain only massive-stars that have progressed to the red-giant stage C) They have very little dust or cool gas, and thus have little ongoing star formation D) A and B E) A and C
Standing at the shore of a still lake, the reflected view of scenery on the far side of the lake is the view you would see if you were upside down with your eye in the line of sight
A) where it presently is. B) at the surface of the water where the light reflects. C) directly beneath you, as far below water level as you are above. D) close to the distant shore. E) none of the above