Physics Laboratory Experiments
8th Edition
ISBN: 9781285738567
Author: Jerry D. Wilson, Cecilia A. Hernández-Hall
Publisher: Cengage Learning
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Chapter 25, Problem 1Q
What is the value of α for copper in terms of Fahrenheit degrees? If the resistance is a linear function on the Celsius scale, will it be a linear function on the Fahrenheit scale? Explain.
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The resistance RT of a platinum varies with temperature T (0C), as measured on the constant-volume gas thermometer according to the equation RT = R0(1+AT+BT2). Where A=3.8 × 10-3 0C-1 and B= -5.6×10-7 0C-2. Calculate the temperature that would be indicated on a platinum thermometer, when the gas scale reads 2000C.
1.5. The resistance of a platinum wire is found to be 11.000 SN at the ice point, 15.247 N at
the steam point, and 28.887 N at the sulfur point. Find the constants a and b in the
equation
R' = R(1+ a@ + be²),
and plot R' against Celsius temperature 0 in the range from 0 to 660°C.
Aluminum, copper, gold, and nichrome wires of equal lengths of 1.0 10-1 meter and equal cross-sectional areas of 2.5 10-6 meter2 are at 20.0°C. Which wire has the greatest electrical resistance?
Chapter 25 Solutions
Physics Laboratory Experiments
Ch. 25 - Prob. 1ASACh. 25 - Prob. 2ASACh. 25 - Distinguish between a positive and a negative...Ch. 25 - Are the of a metal conductor and the of a...Ch. 25 - What are the circuit conditions when a Wheatstone...Ch. 25 - Prob. 6ASACh. 25 - What is the value of for copper in terms of...Ch. 25 - Prob. 3QCh. 25 - Prob. 4QCh. 25 - Prob. 5Q
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- 1.5. The resistance of a platinum wire is found to be 11.000 N at the ice point, 15.247 N at the steam point, and 28.887 N at the sulfur point. Find the constants a and b in the equation e Fa ation R' = R(1+ a0 + b0²), and plot R' against Celsius temperature 0 in the range from 0 to 660°C. 16 When the ice point i and the steam point s were chosen as fixed points with 100arrow_forwardConsider the following table showing temperature as a function of resistance: R(ohm) Temp (°C) 1005.0 24.231 815.3 29.232 645.0 38.219 482.2 48.227 Find the temperature corresponding to 766.5 ohms using quadratic splines. Assume the first spline is linear. a₁ =0 Show all the work to find b₁ and c₁arrow_forwardIn one form of plethysmograph (a device for measuring volume), a rubber capillary tube with an inside diameter of 1.41 mm is filled with mercury at 20°C. The resistance of the mercury is measured with the aid of electrodes sealed into the ends of the tube. If 100.00 cm of the tube is wound in a spiral around a patient's upper arm, the blood flow during a heartbeat causes the arm to expand, stretching the tube to a length of 100.08 cm. From this observation, and assuming cylindrical symmetry, you can find the change in volume of the arm, which gives an indication of blood flow. Take PHg = 9.4 x 10-7. m. (a) Calculate the resistance of the mercury. Ω (b) Calculate the fractional change in resistance during the heartbeat. Hint: Because the cylindrical volume is constant, V = A;L; = AƒLƒ and Aƒ = A;(L;/Lf). % increasearrow_forward
- An 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_forwardIn one form of plethysmograph (a device for measuring volume), a rubber capillary tube with an inside diameter of 1.30 mm is filled with mercury at 20°C. The resistance of the mercury is measured with the aid of electrodes sealed into the ends of the tube. If 100.00 cm of the tube is wound in a spiral around a patient's upper arm, the blood flow during a heartbeat causes the arm to expand, stretching the tube to a length of 100.20 cm. From this observation, and assuming cylindrical symmetry, you can find the change in volume of the arm, which gives an indication of blood flow. Take ?Hg = 9.4 ✕ 10−7 Ω · m. (a) Calculate the resistance of the mercury. (b) Calculate the fractional change in resistance during the heartbeat. Hint: Because the cylindrical volume is constant, V = Ai Li = Af Lf and Af = Ai(Li/Lf).arrow_forwardIn one form of plethysmograph (a device for measuring volume), a rubber capillary tube with an inside diameter of 1.00 mm is filled with mercury at 20°C. The resistance of the mercury is measured with the aid of electrodes sealed into the ends of the tube. If 100.00 cm of the tube is wound in a spiral around a patient’s upper arm, the blood flow during a heartbeat causes the arm to expand, stretching the tube to a length of 100.04 cm. From this observation, and assuming cylindrical symmetry, you can find the change in volume of the arm, which gives an indication of blood flow. (a) Calculate the resistance of the mercury. (b) Calculate the fractional change in resistance during the heartbeat. Take ρHg = 9.4 × 10−7 Ω m. Hint: Because the cylindrical volume is constant, V = AiLi = and Af = Ai(Li/Lf )arrow_forward
- (c) Aluminium is a good conductor of electricity. A 100 m aluminium wire of diameter 2.25 mm is to be used in domestic electrical wiring. If a voltage of 250V and a current of 13 amps are needed, answer the following i. What is the conductivity of the aluminium wire? ii. Give two reasons why aluminium wire is not used in domestic wiring in Zambia? iii. Give three applications of pure aluminium.arrow_forwardThe diameter of 0-gauge copper wire is 8.252 mm. Find the resistance of a 1.00-km length of such wire used for power transmission, taking into account the thermal expansion of the tungsten filament. You may assume a thermal expansion coefficient of 12×10−6/C. By what percentage does your answer differ from the one you get without taking the thermal expansion into account? a) 4.5Ω (total), 7.1% decrease b) 0.34Ω (total), 93% decrease c) 4.7Ω (total), 3.0% decrease d) 5.0Ω (total), 4.2% increasearrow_forwardIn preparation for a study of the metabolism of an organism, a small, sealed calorimeter was prepared. In the initial phase of the experiment, a current of 20.2 mA from a 15.8 V source was passed for 180.4 s through a heater inside the calorimeter. What is the change in internal energy of the calorimeter? J. 3 sig. number.arrow_forward
- An electron moving in a wire collides repeatedly with atoms and travels an average distance between collisions called the mean free path. If the mean free path is less in some metals, what can you say about the resistance of these metals? For a given conductor, what can be done to lengthen the mean free path?arrow_forwardThe resistance of the tungsten filament of an incandescent light bulb at 24 degC is 32 Ohms. If the light bulb is connected to a voltage of 130 V a current of 0.3 A flows through the filament. What will be the temperature of the light bulb filament under working conditions? The temperature coefficient of resistance of tungsten is 4.6E-3 1/degC. Your answer must be in degC, other scales are not accepted.arrow_forwardA 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_forward
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Ohm's law Explained; Author: ALL ABOUT ELECTRONICS;https://www.youtube.com/watch?v=PV8CMZZKrB4;License: Standard YouTube License, CC-BY