Four equal positive charges are placed at the corners of a square. The force on a +1 C charge placed at the center due to any single charge is 10 N. The value of the electric field at the center due to the charges at the corners is ________ N/C.
Fill in the blank(s) with the appropriate word(s).
zero
0
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Starting from very far away, an object is moved closer and closer to a converging lens, eventually reaching the lens. What happens to its image formed by that lens? (There could be more than one correct choice.)
A) The image gets farther and farther from the lens. B) The image eventually changes from real to virtual. C) The image eventually changes from virtual to real. D) The image gets closer and closer to the lens. E) The image keeps getting larger and larger.
An astronaut traveling with a speed v = 0.90c holds a meterstick in his hand. If he measures its length, he will obtain a value of
A. 1.0 m B. 2.3 m C. 0.19 m D. 0.43 m E. 0.81 m
The armature (or spinning portion) of a motor is accelerated uniformly from rest to a rotational velocity of 1500 rev/min in 10 seconds. The rotational acceleration of the motor is
A. 150 rad/s2. B. zero. C. 31.4 rad/s2. D. 15.7 rad/s2. E. 75 rad/s2.
Describe Couette flow
What will be an ideal response?