The current in an inductor connected to an AC voltage source lags the voltage. This lag is caused by the:
a. back emf in the coil.
b. voltage across the coil.
c. time required for electrical signals to travel through all the coils of an inductance.
d. resistance of the coil.
a
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In a certain process a gas ends in its original thermodynamic state. Of the following, which is possible as the net result of the process?
A. It is adiabatic and the gas does 50 J of work B. The gas does no work but absorbs 50 J of energy as heat C. The gas does no work but loses 50 J of energy as heat D. The gas loses 50 J of energy as heat and does 50 J of work E. The gas absorbs 50 J of energy as heat and does 50 J of work
Information-carrying nerves are connected to the retina at the
A) fovea. B) blind spot. C) cornea. D) iris. E) periphery.
A 3.0-kg block moves up a 40° incline with constant speed under the action of a 26-N force acting up and parallel to the incline. What magnitude force must act up and parallel to the incline for the block to move down the incline at constant velocity?
A. 14 N B. 12 N C. 16 N D. 18 N E. 25 N
A small dense object is suspended from the rear view mirror in a car by a lightweight fiber. As the car is accelerating at 1.90 m/s2, what angle does the string make with the vertical?