Tritium has a half-life of 12.3 years. What proportion of its original radioactivity will a sample have after 2 years?
a. 0.01
b. 0.89
c. 0.37
d. 0.16
e. 0.25
b
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What is the average power dissipation in a series RC circuit if R = 6.35 k?, C = 2.64 µF, and V = (192 V) cos 115t?
a. 2.29 W b. 5.81 W c. 2.90 W d. 3.23 W e. 6.47 W
A girl throws a rock horizontally, with a velocity of 10 m/s, from a bridge. It falls 20 m to the water below. How far does the rock travel horizontally before striking the water, assuming negligible air effects?
A) 14 m B) 16 m C) 20 m D) 24 m
Current: When a current flows through a metal wire, the moving charges are
A. only protons. B. only electrons. C. both protons and electrons. D. positive metal ions. E. negative metal ions.
An object is executing simple harmonic motion. What is true about the acceleration of this object? (There may be more than one correct choice.)
A) The acceleration is a maximum when the displacement of the object is a maximum. B) The acceleration is a maximum when the speed of the object is a maximum. C) The acceleration is a maximum when the displacement of the object is zero. D) The acceleration is zero when the speed of the object is a maximum. E) The acceleration is a maximum when the object is instantaneously at rest.