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Physics for Scientists and Engineers: A Strategic Approach with Modern Physics (4th Edition)
- Power P0 = I0 V0 is delivered to a resistor of resistance R0. If the resistance is doubled (Rnew = 2R0) while the voltage is adjusted such that the current is constant, what are the ratios (a) Pnew/P0 and (b) Vnew/V0? If, instead, the resistance is held constant while Pnew = 2P0, what are the ratios (c) Vnew/V0, and (d) Inew/I0?arrow_forwardExplain why R=R0(1 + a?T) for the temperature variation of the resistance R of an object is not as accurate as P=P0(1 + a?T) which gives the temperature variation of resistivity P.arrow_forwardA 10.00-meter long wire cable that is made of copper has a resistance of 0.051 ohms, (a) What is the weight if the wire was made of copper? (b) What is the weight of a 10.00-meter-long wire of the same gauge made of aluminum? (c)What is the resistance of the aluminum wire? The density of copper is 8960 kg/m3 and the density of aluminum is 2760 kg/m3.arrow_forward
- Two conducting wires A and B of the same length and radius are connected across the same potential difference. Conductor A has twice the resistivity of conductor B. What is the ratio of the power delivered to A to the power delivered to B? (a) 2 (b) 2 (c) 1 (d) 12 (e)12arrow_forwardI need a proper solution for the following question. You are working at a company that manufactures electrical wire. Gold is the most ductile of all metals: it can be stretched into incredibly long, thin wires. The company has developed a new technique that will stretch 1.00 g of gold into a wire of length L = 2.40 km and uniform diameter. Your supervisor gives you the task of determining the resistance of such a wire at 20.00C.arrow_forwardTwo wires have the same resistance and diameter. If the wires are made of silver and copper with resistivities respectively of 1.59 ✕ 10−8 Ω · m and 1.70 ✕ 10−8 Ω · m, determine the ratio of their lengths.arrow_forward
- A wire of initial length L0 and radius r0 has a measured resistance of 1.0 Ω. The wire is drawn under tensile stress to a new uniform radius of r ═ 0.25r0. What is the new resistance of the wire?arrow_forwardA 580 mm long tungsten wire, with a 0.048 mm diameter circular cross section, is wrapped around in the shape of a coil and used as a filament in an incandescent light bulb. When the light bulb is connected to a battery, a current of 0.536 A is measured through the filament. Tungsten has a resistivity of 4.9 x 10-8 Ohms x m. How many electrons pass through this filament in 5 seconds? What is the resistance of this filament? What is the voltage of the battery that would produce this current in the filament?arrow_forwardAssuming that you wish to make a uniform wire out of 2 grams of copper. If the wire is to have a resistance R= 0.75 Ω, and if all of the copper wire is to be used, what will be the (a) length, and (b) diameter of the wire? Density of Cu= 8.92 x 10^3 kg/m^3. Resistivity of Cu = 1.7 x 10^-8 (Ω-m)arrow_forward
- An aluminum rod with a square cross section is 2.2 m long and 6.2 mm on edge. (a) What is the resistance between its ends? (b) What must be the diameter of a cylindrical copper rod of length 2.2 m if its resistance is to be the same as that of the aluminum rod? The resistivity of aluminum is 2.75 x 108 Q-m and the resistivity of copper is 1.69 × 10-8 Q-m. (a) Number Units (b) Number i Unitsarrow_forwardA length of copper wire has a resistance 24 Ω. The wire is cut into three pieces of equal length, which are then connected as parallel lengths between points A and B. What resistance will this new “wire” of length L0 3 have between points A and B? Answer in units of Ω.arrow_forwardA 10-gauge copper wire (diameter = 2.588 mm, ρ = 1.7 × 10–8 Ω · m) has a total resistance of 0.32 Ω. How long is the wire? A wire 10 m long with a diameter of 1.0 mm has a resistance of 5.0 Ω. What is the resistance of a second wire made of the same material, but 3.0 m long with a diameter of 4.0 mm? Please provide formula used and steps in orderarrow_forward
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