The student engineer of a campus radio station wishes to verify the effectiveness of the lightning rod on the antenna mast (Fig. P21.71). The unknown resistance Rx is between points C and E. Point E is a true ground, but it is inaccessible for direct measurement because this stratum is several meters below the Earth’s surface. Two identical rods are driven into the ground at A and B, introducing an unknown resistance Ry. The procedure is as follows. Measure resistance R1 between points A and B, then connect A and B with a heavy
Figure P21.71
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Chapter 21 Solutions
Principles of Physics: A Calculus-Based Text, Hybrid (with Enhanced WebAssign Printed Access Card)
- A 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_forwardThe duration of a photographic flash is related to an RC time constant, which is 0.100F for a certain camera, (a) If the resistance of the flash lamp is 0.0400 duringdischarge, what is the size of the capacitor supplying its energy? (b) What is the time constant for charging the capacitor, if the charging resistance is 800 k ?arrow_forwardWhat is the resistance of Part A A0.700 m long copper wire that is 0.600 mm in diameter? Hνα ΑΣφ ? Ω Submit Request Answer Part B A 90.0 cm long piece of carbon with a 0.800 mm x 0.800 mm square cross section? Hνα ΑΣφ ? Ωarrow_forward
- a10arrow_forwardNerve impulses are carried along axons, the elongated fibers that transmit neural signals. We can model an axon as a tube with an inner diameter of 10 μm. The tube wall is insulated, but the fluid inside it has a resistivity of 0.50 Ω⋅m. What is the resistance of a 7.0- mm -long axon?Express your answer with the appropriate units.arrow_forwardThe resistance R of a piece of wire has thermometric properties which can be described as a linear function of temperature (T, in C), R=mT¹/2+n Where m and n are constants. The resistance of the wire is found to be 4.80 at the temperature of melting ice (0.0 ℃) and 9.30 № at the boiling of water (100 °C) at atmospheric pressure. a) Find the constants m and n. b) Determine the temperature when R is 7.95 №. c) Based on the information provided above, is this wire element suitable for determining temperature below 0 ℃?arrow_forward
- In (Figure 1), R1R1R_1 = 3.00 ΩΩ, R2R2R_2 = 7.00 ΩΩ, and R3R3R_3 = 4.00 ΩΩ. The battery has negligible internal resistance. The current I2I2 through R2R2 is 3.00 A . What is the current I3I3 through R3R3? Express your answer with the appropriate unitsarrow_forwardNerve impulses are carried along axons, the elongated fibers that transmit neural signals. We can model an axon as a tube with an inner diameter of 10 μm. The tube wall is insulating, but the fluid inside it has a resistivity of 0.50 Ω • m. What is the resistance of a 1-mm-long axon?arrow_forwarda.Estimate the electrical resistance of the blood in a 50cm long, 3mm diameter artery. The resistivity of blood is 1.6 ohm-meter.Express your answer in cΩ, mΩ,μΩ, and nΩ. B. Suppose the energy for two doughnuts in Thermodynamics are totally converted into electric potential energy at point a, wherein a dust particle of 5 × 10-9 kg with 9nC charge is travelling from point a with 600 m/s to point b (where there is no electric potential energy). How fast does the dust particle is moving at point b?arrow_forward
- In the figure R1 = 110 Q, R2 = R3 = 75.0 Q, R4 = 110 Q, and the ideal battery has emf ɛ = 6.00 V. (a) What is the equivalent resistance? What is i in (b) resistance 1, (c) resistance 2, (d) resistance 3, and (e) resistance 4? R R. R R (a) Number i Units (b) Number i Units (c) Number i Units (d) Number i Units (e) Number i Unitsarrow_forward1.00 MQ A conducting sphere is charged by an emf source E through a 1.00 MO resistor. When the sphere is fully charged, it has 2 µC charge. The highest current during the charging was I mA. What is the electrical potential energy of the sphere when it is fully charged? Give your answer in mJ.arrow_forwardFor the purpose of measuring the electric resistance of shoes through the body of the wearer standing on a metal ground plate, the American National Standards Institute (ANSI) specifies the circuit shown in Figure P27.14. The potential difference AVacross the 1.00-M2 resistor is measured with an ideal voltmeter. (a) Show that the resistance of the footwear is 50.0 V – AV shoes AV (b) In a medical test, a current through the human body should not exceed 150 µA. Can the current delivered by the ANSI-specified circuit exceed 150 µA? To decide, consider a person standing barefoot on the ground plate. 1.00 MN V 50.0 V Figure P27.14arrow_forward
- Principles of Physics: A Calculus-Based TextPhysicsISBN:9781133104261Author:Raymond A. Serway, John W. JewettPublisher:Cengage Learning