Which of the following makes an approximate uniform electric field?
A) a metal charged sphere
B) a metal charged cylinder
C) a very long line of positive charge
D) very large, closely separated, parallel oppositely charged plates
E) two long parallel, closely separated, oppositely charged lines of charge
D
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Rotational Kinetic Energy: A string is wrapped tightly around a fixed pulley that has a moment of inertia of 0.0352 kg ? m2 and a radius of 12.5 cm. A mass of 423 g is attached to the free end of the string. With the string vertical and taut, the mass is gently released so it can descend under the influence of gravity. As the mass descends, the string unwinds and causes the pulley to rotate, but does not slip on the pulley. What is the speed of the mass after it has fallen through 1.25 m?
A. 2.00 m/s B. 2.28 m/s C. 1.97 m/s D. 3.94 m/s E. 4.95 m/s
Airplane flight best illustrates
A) Archimedes' principle. B) Pascal's principle. C) Bernoulli's principle. D) Boyle's law.
According to the universal law of gravitation, if you triple the distance between two objects, then the gravitational force between them
A) increases by a factor of 9. B) decreases by a factor of 9. C) decreases by a factor of 3. D) increases by a factor of 3.
How does the velocity of sound in air vary with the air temperature?