A chain reaction progresses when the average number of liberated neutrons that cause further fissions is
A) zero.
B) less than one.
C) one or more.
D) none of the above
Answer: C
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A ball thrown vertically from ground level is caught 3.0 s later when it is at its highest point by a person on a balcony which is 14 m above the ground. Determine the initial speed of the ball
a. 19 m/s b. 4.7 m/s c. 10 m/s d. 34 m/s e. 17 m/s
An AC generator consists of 6 turns of wire. Each turn has an area of 0.040 m2. The loop rotates in a uniform field (B = 0.20 T) at a constant frequency of 50 Hz. What is the maximum induced emf?
A. 13 V B. 2.4 V C. 3.0 V D. 15 V E. 4.8 V
Radioactive Decay: Rutherfordium-261 has a half-life of 1.08 min. What is the decay constant of rutherfordium-261 in terms of seconds?
A. 0.0107 s-1 B. 0.0154 s-1 C. 1.87 s-1 D. 2.91 s-1 E. 0.344 s-1
A simple pendulum, 2.0 m in length, is released by a push when the support string is at an angle of 25° from the vertical. If the initial speed of the suspended mass is 1.6 m/s when at the release point, to what maximum angle will it move in the second half of its swing?
a. 86.3° b. 32.8° c. 39.1° d. 83° e. 180°