A neutral hollow spherical conducting shell of inner radius 1.00 cm and outer radius 3.00 cm has a +2.00-µC point charge placed at its center. Find the surface charge density (a) on the inner surface of the shell. (b) on the outer surface of the shell
What will be an ideal response?
Answer: (a) -1590 µC/m2 (b) +177 µC/m2
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When can we be certain that the average velocity of an object is always equal to its instantaneous velocity?
A) always B) never C) only when the velocity is constant D) only when the acceleration is constant E) only when the acceleration is changing at a constant rate
Two equal masses are raised at constant velocity by ropes that run over pulleys, as shown below. Mass B is raised twice as fast as mass A. The magnitudes of the forces are FA and FB, while the power supplied is respectively PA and PB. Which statement is correct?
?
?
A. FB = FA; PB = PA. B. FB = FA; PB = 2 PA. C. FB = 2 FA; PB = PA. D. FB = 2 FA; PB = 2 PA. E. PA = FA; PB = FB.
The most important advantage of CCDs over film is that:
A) they record much more light in a given exposure time. B) their images do not have to be developed as film does. C) they record colors better than film can. D) they can cover larger areas of the sky than film can. E) their images never fade, as film can.
A furlong is a distance of 220 yards. A fortnight is a time period of two weeks. A horse is running at a speed of 4.00 yards per second. What is his speed in furlongs per fortnight?
a. 2200 furlongs/fortnight c. 11,000 furlongs/fortnight b. 4980 furlongs/fortnight d. 22,000 furlongs/fortnight