EP PHYSICS F/SCI.+ENG.W/MOD..-MOD.MAST.
5th Edition
ISBN: 9780134402635
Author: GIANCOLI
Publisher: PEARSON CO
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9. (II) A bird stands on a de electric transmission line
carrying 2800 A (Fig. 18–34). The line has 2.5 × 10~$ N
resistance per meter, and the bird's feet are 4.0 cm apart.
What is the potential difference between the bird's feet?
FIGURE 18-34 Problem 9.
(ii) What will be the value of the voltage drop across the R3 = 80 resistor?|
R1
50
R2
100
V
30 V
R3
80
(II) You want to design a portable electric blanket that runson a 1.5-V battery. If you use a 0.50-mm-diameter copperwire as the heating element, how long should the wire be ifyou want to generate 18 W of heating power? What happensif you accidentally connect the blanket to a 9.0-V battery?
Chapter 25 Solutions
EP PHYSICS F/SCI.+ENG.W/MOD..-MOD.MAST.
Ch. 25.2 - If 1 million electrons per second pass a point in...Ch. 25.2 - Prob. 1BECh. 25.3 - Return to the Chapter-Opening Question, page 651,...Ch. 25.4 - Prob. 1DECh. 25.4 - Prob. 1EECh. 25.4 - Prob. 1FECh. 25.4 - How many 60-W 120-V lightbulbs can operate on a...Ch. 25.6 - Each channel of a stereo receiver is capable of an...Ch. 25 - What quantity is measured by a battery rating...Ch. 25 - When an electric cell is connected to a circuit,...
Ch. 25 - When a flashlight is operated, what is being used...Ch. 25 - One terminal of a car battery is said to be...Ch. 25 - When you turn on a water faucet, the water usually...Ch. 25 - Can a copper wire and an aluminum wire of the same...Ch. 25 - The equation P = V2/R indicates that the power...Ch. 25 - What happens when a lightbulb burns out?Ch. 25 - If the resistance of a small immersion heater (to...Ch. 25 - Prob. 10QCh. 25 - Explain why lightbulbs almost always burn out just...Ch. 25 - Which draws more current, a 100-W lightbulb or a...Ch. 25 - Electric power is transferred over large distances...Ch. 25 - A 15-A fuse blows repeatedly. Why is it dangerous...Ch. 25 - When electric lights are operated on low-frequency...Ch. 25 - Driven by ac power, the same electrons pass back...Ch. 25 - The heating element in a toaster is made of...Ch. 25 - Is current used up in a resistor? Explain.Ch. 25 - Compare the drift velocities and electric currents...Ch. 25 - A voltage V is connected across a wire of length l...Ch. 25 - Why is it more dangerous to turn on an electric...Ch. 25 - Prob. 1PCh. 25 - Prob. 2PCh. 25 - Prob. 3PCh. 25 - Prob. 4PCh. 25 - Prob. 5PCh. 25 - Prob. 6PCh. 25 - Prob. 7PCh. 25 - Prob. 8PCh. 25 - Prob. 9PCh. 25 - Prob. 10PCh. 25 - Prob. 11PCh. 25 - Prob. 12PCh. 25 - Prob. 13PCh. 25 - Prob. 14PCh. 25 - Prob. 15PCh. 25 - (II) A rectangular solid made of carbon has sides...Ch. 25 - (III) A hollow cylindrical resistor with inner...Ch. 25 - Prob. 63GP
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- - (II) A bird stands on a dc electric transmission line carrying 4100 A (Fig. 18–34). The line has 2.5 × 10-° N resistance per meter, and the bird's feet are 4.0 cm apart. What is the potential difference between the bird's feet? GURE 18–34 roblem 8.arrow_forward80 In Fig. 27-73, R1 = 5.00 0, R2 = 10.0 0, R3= 15.0 n, C= 5.00 µF, |C = 10.0 µF, and the ideal battery R. %3D has emf & = 20.0 V.Assuming that the circuit is in the steady state, what is the total energy stored in the two R1 C2 capacitors?arrow_forwardWhen applying Kirchhoff's loop rule (such as in Fig. 19–36), does the sign (or direction) of a battery's emf depend on the direction of current through the battery? What about the terminal voltage? r= 1.0 2 E = 18 V R=6.6 N r= 2.0 Q FIGURE 19-36 Question 10. E = 12 Varrow_forward
- 71 In Fig. 27-69, R¡ = 20.0 N, R, 10.0 2, and the ideal battery has emf E = 120 V. What is the current at point a if we close (a) only switch S1, (b) only switches S, and S2, and (c) all three switches? S2 S3 a +18 RE RE R R1- + R1 R2 R2 Figure 27-69 Problem 71.arrow_forward35 (a) For the circuit shown in Fig. 20-27, let & = 10 V, R = 5.0 N, and C = 0.1 F. What is the current at b just after the switch is closed? (b) How much charge will have passed b by the time %3D %3D %3D the current goes to zero? (c) Find the current at the instant the capacitor has a charge of 0.20 C. 9. Soitch Sarrow_forward95 In Fig. 27-79, E, = 6.00 V, = 12.0 V, R = 100 0, R, = 200 N, and R, = 300 N. One point of the circuit is grounded (V = the (a) size and (b) direction (up or down) of the current through resistance 1, the (c) size and (d) direction (left or right) of the current through resistance 2, and the (e) size and (f) direction of the current through resistance 3? (g) What is the electric potential at point A? 0), What arearrow_forward
- (II) Electrocardiographs are often connected as shown in Fig. 19–68. The lead wires to the legs are said to be capac- itively coupled. A time constant of 3.0 s is typical and allows rapid changes in potential to be recorded accurately. If C = 3.0 µF, what value must R have? [Hint: Consider each leg as a separate circuit.] - To left-leg C electrode R Recorder - To right-leg electrode (ground) R C GURE 19-68 ·To arm electrode oblem 53. Amplifierarrow_forward(1) Some Christmas tree lights have a characteristic that when one light (filament) burns out, the lights throughout go out too. However, burned-out lights go out in other series lights. Discuss the difference of these two sets of lights. (2) Why do lights on a car become dimmer when you start a car? (3) What similarities and differences do you see from the equivalent resistance and capacitance formula?arrow_forward(II) An electric circuit was accidentally constructed usinga 7.0µ F capacitor instead of the required 16 µ F value.Without removing the 7.0µ F capacitor, what can a technician add to correct this circuit?arrow_forward
- (II) Determine the magnitudes and directions of the currents V1 =9.0 V _Rị = 22 $2 through R1 and R2 in Fig. 19–59. R2 = 18 2 V3 =6.0 V FIGURE 19-59 Problems 31 and 32.arrow_forwardSuppose that by mistake you leave ten 50-W light bulbs turned on at your house for 24 hr. Say that the cost of electricity is 6 cents per kW · hr. (i)How many Joules are used by the ten light bulbs over the 24 hours? (ii) calculate the cost for this mistake?arrow_forward(b) Consider a particular phone that has a battery rated at 2.500 mAh. The battery operates at a potential difference of 3.90 V. How much energy, in units of kilowatt-hours, is stored in a fully charged battery? 0.975-2 ✓kWh (c) If electricity costs $0.16 (or 16.0 cents) per kilowatt-hour, what is the value of the total amount of energy stored in this battery? Express your answer in cents (or 0.01 of a dollar). How can you relate the energy from part (b) to the cost per kilowatt-hour to find the total cost? (d) When the phone is idle (that is, turned on but not making calls or texts, using GPS, or running any power-hungry apps), it will operate continuously for 32.2 hours from a fully charged battery, until the battery runs out. How much average current does the phone draw while idle? Express your answer in milliamperes, MAarrow_forward
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