To deduce the interior conditions of the dense regions in which stars form, it is necessary for astronomers to observe in the ________ part of the spectrum
Fill in the blank(s) with correct word
infrared
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Three identical point charges (+2.0 nC) are placed at the corners of an equilateral triangle with sides of 2.0-m length. If the electric potential is taken to be zero at infinity, what is the potential at the midpoint of any one of the sides of the triangle?
a. 16 V b. 10 V c. 70 V d. 46 V e. 44 V
A simple ac circuit consists of an inductor connected across the terminals of an ac power source. If the frequency of the ac source is decreased by a factor of four, what happens to the reactance of the inductor?
A) It increases by a factor of eight. B) It decreases by a factor of four. C) It increases by a factor of four. D) It increases by a factor of two. E) It decreases by a factor of eight.
A steel wire, 3.2 m long, has a diameter of 1.2 mm. The wire stretches 1.6 mm when it bears a load. Young's modulus for steel is 2.0 × 1011 Pa. The mass of the load is closest to
A) 28 kg. B) 24 kg. C) 16 kg. D) 20 kg. E) 12 kg.
Which of the following were found from Millikan's oil drop experiment?
a. the weight, and hence the mass, of the electron b. all of the above c. that quarks have charges that are fractions of the electronic charge d. the value of the electron's quantized charge