What is the impedance of an AC series circuit that is constructed of a 10.0-? resistor along with 24.0-? inductive reactance and 7.0-? capacitive reactance?
a. 19.7 ? b. 11.2 ?
c. 41.0 ? d. 27.7 ?
a
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Energy and Momentum: As shown in the figure, a bullet of mass 0.010 kg moving horizontally suddenly strikes a block of wood of mass 1.5 kg that is suspended as a pendulum. The bullet lodges in the wood, and together they swing upward a vertical distance of 0.40 m. The length of the string is 2.0 m. What was the speed of the bullet just before it struck the wooden block?
A. 67 m/s B. 250 m/s C. 370 m/s D. 420 m/s E. 650 m/s
A key feature of the theory of chaos is
A) unpredictability. B) very small initial differences can lead to very large eventual differences. C) the randomness of molecular motion makes prediction difficult. D) even orderly systems are seen to be disorderly when carefully studied.
The half-life of 131I is 8.04 days. Three days after it was prepared, its activity was 0.50 ?Ci. How many curies (in ?Ci) were initially prepared?
a. .60 b. .70 c. .65 d. .55 e. .39
Let's say that during a thunderstorm you measure the time lag between the flash and the thunderclap to be 3 seconds. If the speed of sound is about 340 m/s, which of the following is the best estimate of your distance to the lightening bolt?
1.about 3 km 2.about 0.3 km 3.about 1 km 4.about 10 km