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An extension cord is used with an electric weed trimmer that has a resistance of 18.7 ?. The extension cord is made of copper (resistivity 1.72 x 10-8 ohm m) wire that has a cross-sectional area of 1.77 x 10-6 m2. The combined length of the two wires in the extension cord is 86.8 m.
(a) Determine the resistance of the extension cord.
(b) The extension cord is plugged into a 120-V socket. What voltage is applied to the trimmer itself?
a hydrogen atom is in the n=15 state. In the Bohr model, how many electron wavelengths fit around this orbit
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A 5 m long string has a mass of 110 g and is under a tension of 900 N. What is the speed of a transverse wave pulse on this wire
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In Millikan's experiment, an oil drop of radius 1.85 μm and density 0.852 g/cm3 is suspended in chamber C whilst a downward electric field of 0.62 × 10^5 N/C is applied. Find the charge on the drop, in terms of e.
A 5.40×10-2- wad of putty is thrown horizontally at the block, hitting it with a speed of 2 and sticking. far does the putty-block system compress spring.
An X-ray photon with a wavelength of 0.260nm scatters from a free electron at rest. Find the initial momentum of the photon
The total impedance of an RC circuit with a resistance of 200 ? is 1060 ?. If the frequency of the applied voltage is 20.0 Hz, what is the value of the capacitance in this circuit
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