Physics for Scientists and Engineers: Foundations and Connections
1st Edition
ISBN: 9781133939146
Author: Katz, Debora M.
Publisher: Cengage Learning
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Chapter 28, Problem 43PQ
To determine
The change in resistance of an aluminum wire in percentage.
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At 20°C, a 7.5 m long copper wire has a cross-sectional diameter of 1 mm. What is the copper wire's resistance (in Ω) at 50°C?
ρcopper = 1.68×10-8 Ω·m
αcopper = 0.0039 /C°
At 20°C, the carbon resistor in an electric circuit connected to a 5.7-V battery has a resistance of 2.7 ✕ 102 Ω. What is the current in the circuit when the temperature of the carbon rises to 90°C?
give answer in mA
A tungsten wire is used to determine the melting point of indium. The resistance of the tungsten wire is 2.788 at 20.0°C and increases to 5.636 as the indium starts to melt. αtungsten = 4.50 x 10−3 (°C)−1. What is the melting temperature of indium in °C?
Chapter 28 Solutions
Physics for Scientists and Engineers: Foundations and Connections
Ch. 28.1 - Prob. 28.1CECh. 28.2 - Prob. 28.2CECh. 28.3 - Prob. 28.3CECh. 28.5 - When a lightbulb burns out, its filament breaks so...Ch. 28.6 - A battery with terminal potential is connected to...Ch. 28.7 - A battery of terminal potential is connected to a...Ch. 28 - Prob. 1PQCh. 28 - Prob. 2PQCh. 28 - Prob. 3PQCh. 28 - Prob. 4PQ
Ch. 28 - Prob. 5PQCh. 28 - Prob. 6PQCh. 28 - Prob. 7PQCh. 28 - Prob. 8PQCh. 28 - Prob. 9PQCh. 28 - Prob. 10PQCh. 28 - Prob. 11PQCh. 28 - Prob. 12PQCh. 28 - Prob. 13PQCh. 28 - Prob. 14PQCh. 28 - The current in a wire varies with time (measured...Ch. 28 - Prob. 16PQCh. 28 - The amount of charge that flows through a copper...Ch. 28 - Prob. 18PQCh. 28 - Prob. 19PQCh. 28 - Prob. 20PQCh. 28 - Prob. 21PQCh. 28 - Prob. 22PQCh. 28 - A copper wire that is 2.00 mm in radius with...Ch. 28 - Prob. 24PQCh. 28 - Prob. 25PQCh. 28 - Prob. 26PQCh. 28 - What is the electric field in an aluminum wire if...Ch. 28 - Prob. 28PQCh. 28 - Prob. 29PQCh. 28 - Prob. 30PQCh. 28 - Prob. 31PQCh. 28 - Prob. 32PQCh. 28 - Two concentric, metal spherical shells of radii a...Ch. 28 - Prob. 34PQCh. 28 - Prob. 35PQCh. 28 - Prob. 36PQCh. 28 - Prob. 37PQCh. 28 - A lightbulb is connected to a variable power...Ch. 28 - Prob. 39PQCh. 28 - Prob. 40PQCh. 28 - Prob. 41PQCh. 28 - Prob. 42PQCh. 28 - Prob. 43PQCh. 28 - A Two wires with different resistivities, 1 and 2,...Ch. 28 - A copper and a gold wire are supposed to have the...Ch. 28 - Gold bricks are formed with the dimensions 7358134...Ch. 28 - Prob. 47PQCh. 28 - Prob. 48PQCh. 28 - Prob. 49PQCh. 28 - Prob. 50PQCh. 28 - Prob. 51PQCh. 28 - Prob. 52PQCh. 28 - Prob. 53PQCh. 28 - Prob. 54PQCh. 28 - A two-slice bread toaster consumes 850.0 W of...Ch. 28 - Prob. 56PQCh. 28 - Prob. 57PQCh. 28 - Prob. 58PQCh. 28 - Prob. 59PQCh. 28 - Prob. 60PQCh. 28 - Prob. 61PQCh. 28 - Prob. 62PQCh. 28 - Prob. 63PQCh. 28 - Prob. 64PQCh. 28 - Prob. 65PQCh. 28 - Prob. 66PQCh. 28 - Prob. 67PQCh. 28 - Prob. 68PQCh. 28 - Prob. 69PQCh. 28 - Prob. 70PQCh. 28 - Prob. 71PQCh. 28 - Prob. 72PQCh. 28 - Prob. 73PQCh. 28 - Prob. 74PQCh. 28 - Review When a metal rod is heated, its resistance...Ch. 28 - Prob. 76PQCh. 28 - Prob. 77PQCh. 28 - Prob. 78PQCh. 28 - Prob. 79PQCh. 28 - Prob. 80PQCh. 28 - Prob. 81PQCh. 28 - A conducting material with resistivity is shaped...
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- Platinum (ρ = 10.6 x 10^-8 Ω-m, α = 3.927 x 10^-3/C^0) is used as resistance thermometer to measure the boiling point of a solution since it has a high melting point. At 20 ^0C, the resistance of the platinum resistance thermometer is 164.20 Ω. When placed in the boiling solution, the resistance of the thermometer is 227.60 Ω. What is this boiling point?arrow_forwardAt 20°C, the carbon resistor in an electric circuit connected to a 6.2-V battery has a resistance of 3.0 ✕ 102 Ω. What is the current in the circuit when the temperature of the carbon rises to 76°C?arrow_forwardYou 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 20.0°C.arrow_forward
- A gold resistance thermometer has a resistance Ro = 70.0Ω at To = 20°C. The temperature coefficient of resistance is 3.4x10-3°C. The thermometer is immersed in a container with melting tin, at which point R increases to 112.5Ω. What is the melting point of tin?arrow_forwardAs the temperature of a metal rod varies, so does the resistance and the dimensions of the rod. If a iron rod has a resistance of 2.78 Ω at 20.0°C, determine the resistance of the rod (in Ω) at 120°C by accounting for the changes in both the resistivity and the dimensions of the rod. The coefficient of linear expansion for iron is 4.50 ✕ 10−6 (°C)−1 and the temperature coefficient of resistivity is 4.50 ✕ 10−3 (°C)−1. Ωarrow_forwardA certain metal has a resistivity of 13.6×108 m at 20°C. the temperature coefficient of the given material is 0.00392°C, what will be the resistivity at 850°C.arrow_forward
- A platinum resistance thermometer (PRT) is a transducer which measures temperature 0 by means of consequent change of electrical resistance RT between its two terminals. Such a PRT has the following quadratic characteristic: RT=Ro [1+A0+BO^2] The PRT is calibrated so that its resistance is Ro = 100 Q at a reference temperature of 0 = 0°C. The coefficients have the following values: A = +4.0 x 10-3 °C-1 B = -5.0 x 10-6 oc-2 Determine sensitivity of this transducer at temperatures of +50 °C. Select one: O a. 0.45 Q/°C Ob. -0.45 Q/°C -0.35 Ω/ΟC d. 0.4 0/°C O e. 0.35 Q/°C O f. -0.4 0/PCarrow_forwardYou 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 1.05 g of gold into a wire of length L-248 km and uniform diameter. Your supervisor gives you the task of determining the resistance of such a wire (in MQ) at 20.0°C. (The density of gold is 19.3 × 103 kg/m3.)arrow_forwardA length of aluminum wire has a resistance of 14.00 a 32.0°C. When the wire is warmed in an oven and reaches thermal equilibrium, the resistance of the wire increases to 29.3 12 Find the temperature of the oven (in "C). (a-3.9 X 10 (C) for aluminum) O 312 256 O ○ 118 MacBook Airarrow_forward
- A conducting cylinder has length 36 mm and radius 17 mm. The conductor is then reshaped into a smaller cylinder, a quarter of the original length, and half that of the original diameter. The conductivity of the material is 6x107/Ω.m. Enter your answer in scientific notation with 2 significant figures. Please calculate the resistance for the reshaped conductorarrow_forwardAt 20.0°C, the carbon resistor in an electric circuit connectedto a 5.0 - V battery has a resistance of 2.0 x 102 Ω. What is thecurrent in the circuit when the temperature of the carbonrises to 80.0°C?arrow_forwardAn electric current of 5 A passing through a resistor has a measured voltage of 6 V across the resistor. The resistor is cylindrical with a diameter of 2.5 cm and length of 15 cm. The resistor has a uniform temperature of 90°C and the room air temperature is 20°C. Assuming that heat transfer by radiation is negligible, determine the heat transfer coefficient by convection.arrow_forward
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