Reactance: What capacitance will have the same reactance as a 100-mH inductance of both of them are in a 120-V 60-Hz circuit?
Fill in the blank(s) with the appropriate word(s).
70 µF
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During the month of June the north celestial pole points towards Polaris but during the month of December it points
a. just north of Polaris. b. just south of Polaris. c. towards the star Vega. d. towards the star Thuban. e. still towards Polaris.
Standing Waves on a String: A string fixed at both ends is vibrating in one of its harmonics. If we now increase only the frequency at which the string is vibrating, which of the following characteristics do we also increase? (There could be more than one correct choice.)
A. the speed of the traveling waves on the string B. the period of the traveling waves on the string C. the wavelength of the traveling waves on the string D. the amplitude of the traveling waves on the string E. None of these
A small object is enclosed in plastic (n = 1.5). The object appears to be 4.0 cm below the surface. What is the actual distance of the object below the surface?
A. 2.0 cm B. 2.7 cm C. 4.0 cm D. 5.5 cm E. 6.0 cm
If the Earth was moved twice as close to the Sun, how would the force of gravity by the Sun on the Earth change?
A) It would be two times weaker. B) It would be unchanged. C) It would be four times weaker. D) It would be two times stronger. E) It would be four times stronger.