Phase Angles: The phase angle in a series RL circuit at 1.0 kHz with a 0.20-k? resistor and a certain inductor is 40°. What is the inductance in this circuit?
A. 84 mH
B. 74 mH
C. 27 mH
D. 37 mH
E. 58 mH
Answer: C
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The massive ram of a pile driver falling from rest strikes a pile with a speed that depends on the
A) initial height of the ram. B) initial potential energy of the ram. C) distance the ram falls. D) all of the above
A hole of radius 1.0 mm occurs in the bottom of a water storage tank that holds water at a depth of 15 m. At what rate will water flow out of the hole?
What will be an ideal response?
Beryl states that insulation with the smallest possible thermal conductivity is best to keep a house warm in winter, but worst for keeping a house cool in summer. Sapphire insists the reverse is true: low thermal conductivity is good in the summer, but bad in the winter. Which one, if either is correct?
a. Beryl, because low thermal conductivity results in low heat transfer. b. Beryl, because low thermal conductivity results in high heat transfer. c. Sapphire, because low thermal conductivity results in low heat transfer. d. Sapphire, because low thermal conductivity results in high heat transfer. e. Neither, because low heat transfer is desirable both in summer and in winter.
Which statement accurately describes how observations of distant galaxies help us learn about galaxy evolution?
A) By observing galaxies with different lookback times, we learn how galaxies appeared at different stages of their evolution. B) We can observe the birth of galaxies. C) We can observe the evolution of a single galaxy over time. D) We can watch as two galaxies merge and view the result, helping us learn how mergers affect evolution. E) We can see what our galaxy used to look like and therefore theorize about the physical processes that led to its current appearance.