After the switch is closed in a series LR circuit, what is the current when a time equal to four time constants has elapsed?
A. (1/5) Imax
B. (15/16) Imax
C. (1/16) Imax
D. 0.018 Imax
E. 0.98 Imax
E. 0.98 Imax
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Ultraviolet light is absorbed in the
A) exosphere. B) thermosphere. C) stratosphere. D) troposphere. E) none of the above
Energy in Nuclear Reactions: A nuclear explosion results in a mass decrease of 2.10 g. How much energy is released during this explosion? (c = 3.00 × 108 m/s)
A. 1.89 × 1014 J B. 6.30 × 105 J C. 1.89 × 1013 J D. 2.25 × 1012 J
A nonuniform 2.0-kg rod is 2.0 m long. The rod is mounted to rotate freely about a horizontal axis perpendicular to the rod that passes through one end of the rod. The moment of inertia of the rod about this axis is 4.0 kg/m2 . The center of mass of the rod is 1.2 m from the axis. If the rod is released from rest in the horizontal position, what is its angular speed as it swings through the
vertical position? a. 3.4 rad/s b. 4.4 rad/s c. 4.3 rad/s d. 5.8 rad/s e. 6.8 rad/s
The half-life of a muon is 2.2 ms. How fast is it moving relative to an observer who says its half-life is 4.4 ms?
a. 0.87 c b. 0.75 c c. 0.97 c d. 0.72 c e. 0.50 c