Which of the following is unique concerning the so-called "Planck's time"?
c.
Planck's time is on the order of 10-43 s, which is about when the Big Bang occurred.
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A boy throws a ball with an initial velocity of 25 m/s at an angle of 30° above the horizontal. If you neglect air, how high above the projection point is the ball after 2.0 s?
A) 5.4 m B) 13 m C) 25 m D) 43 m E) 50 m
An uncharged spherical conducting shell surrounds a charge ?q at the center of the shell. The charges on the inner and outer surfaces of the shell are respectively
a. ?q, ?q. b. ?q, +q. c. +q, ?q. d. +q, +q. e. +q, 0.
If you think of a battery as an electric charge ‘pump,' the battery voltage is analogous to
a. rate of fluid flow. b. pressure. c. flow velocity. d. water. e. none of the above.
A particle (q = 3.0 mC, m = 20 g) has a speed of 20 m/s when it enters a region where the electric field has a constant magnitude of 80 N/C and a direction which is the same as the velocity of the particle. What is the speed of the particle 3.0 s after it enters this region?
a. 68 m/s b. 44 m/s c. 56 m/s d. 80 m/s e. 36 m/s