A circuit contains two inductors of 6.0-mH inductance in series placed in parallel with an inductor of 8.0-mH inductance. After one of the 6.0-mH inductors burns out, the repair person wants to replace all three inductors with one inductor of equivalent inductance. Assuming inductors combine in series and parallel the same way resistors do, what inductance should she use?
a. 3.0 mH
b. 3.4 mH
c. 4.8 mH
d. 11 mH
e. 20 mH
c
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Derive an expression for the heat transfer from a tapered fin having base of Y thickness, L length, ? thermal conductivity, h0 convective coefficient, and T0 base temperature. The surrounding fluid temperature is T? .
What will be an ideal response?
A high-voltage powerline operates at 500,000 V rms and carries an rms current of 500 A. If the resistance of the cable is 0.050 ?/km, what is the resistive power loss in 200 km of the powerline?
A. 250 kW B. 500 kW C. 1 megawatt D. 2.5 megawatts E. 250 megawatts
A spear is thrown at you at a very high speed. As it passes, you measure its length as one-half its normal length. From this measurement, you conclude that the moving spear's mass must be
A) one-half its rest mass. B) twice its rest mass. C) four times its rest mass. D) zero.
A crystal diffracted a beam of electrons. The crystal spacing was 0.18 nm and the maximum scattering occurred at 80.° relative to the surface normal. The electrons were directed normally onto the crystal
(a) What is the wavelength of the electrons? (b) What potential difference accelerated the electrons?