The capacitance per unit length of a very long coaxial cable, made of two concentric cylinders, is 50 pF/m. What is the radius of the outer cylinder if the radius of the inner one is 1.0 mm? (k = 1/4??0 = 8.99 × 109 N • m2/C2)
A) 3.0 mm
B) 2.0 mm
C) 4.0 mm
D) 1.0 mm
E) 0.50 mm
A
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Electricity may be generated by rotating a loop of wire between the poles of a magnet. The induced current is greatest when
a. the plane of the loop is parallel to the magnetic field. b. the plane of the loop is perpendicular to the magnetic field. c. the magnetic flux through the loop is a maximum. d. the plane of the loop makes an angle of 45° with the magnetic field.
If the speed of a continuous wave is constant, as you increase the frequency of the wave, the wave must have a proportionally _________ wavelength
Fill in the blank(s) with correct word
How is the GAIA mission relevant to the search for extrasolar planets?
A) It can detect planets through the astrometric method. B) It can obtain moderate-resolution images of extrasolar planets. C) It can detect planets through the Doppler method. D) It can detect planets through the transit method.
Newton's Second Law in 1 Dimension: A certain aircraft has a mass of 300,000 kg. At a certain instant during its landing, its speed is 27.0 m/s. If the braking force is a constant 445,000 N, what is the speed of the airplane 10.0 s later?
A. 10.0 m/s B. 12.2 m/s C. 14.0 m/s D. 18.0 m/s E. 20.0 m/s