35 Pages

#### 26_DC Currents

Course: PHYSICS 123, Fall 2008

School: Rutgers

Word Count: 15394

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CIRCUITS 26 26.1. 26.2. 26.3. IDENTIFY: DIRECT-CURRENT The newly-formed wire is a combination of series and parallel resistors. SET UP: Each of the three linear segments has resistance R/3. The circle is two R/6 resistors in parallel. EXECUTE: The resistance of the circle is R/12 since it consists of two R/6 resistors in parallel. The equivalent resistance is two R/3 resistors in series with an R/6 resistor,...

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Rutgers - PHYSICS - 123
CURRENT, RESISTANCE, AND ELECTROMOTIVE FORCE2525.1.25.2.IDENTIFY: I = Q / t . SET UP: 1.0 h = 3600 s EXECUTE: Q = It = (3.6 A)(3.0)(3600 s) = 3.89 104 C. EVALUATE: Compared to typical charges of objects in electrostatics, this is a huge amou
Rutgers - PHYSICS - 123
CAPACITANCE AND DIELECTRICS2424.1.24.2.24.3.Q Vab SET UP: 1 F = 10 -6 F EXECUTE: Q = CVab = (7.28 10 -6 F)(25.0 V) = 1.82 10 -4 C = 182 C EVALUATE: One plate has charge + Q and the other has charge -Q . Q PA and V = Ed . IDENTIFY and SE
Rutgers - PHYSICS - 123
ELECTRIC POTENTIAL23ra = 0.150 m rb = (0.250 m) 2 + (0.250 m) 2 rb = 0.3536 m23.1.IDENTIFY: Apply Eq.(23.2) to calculate the work. The electric potential energy of a pair of point charges is given by Eq.(23.9). SET UP: Let the initial position
Rutgers - PHYSICS - 123
GAUSS'S LAW22^ E = E cos dA, where is the angle between the normal to the sheet n and the22.1.(a) IDENTIFY and SET UP:electric field E . EXECUTE: In this problem E and cos are constant over the surface so E = E cos dA = E cos A = (1
Rutgers - PHYSICS - 123
ELECTRIC CHARGE AND ELECTRIC FIELD2121.1.(a) IDENTIFY and SET UP: Use the charge of one electron ( -1.602 10 -19 C) to find the number of electrons required to produce the net charge. EXECUTE: The number of excess electrons needed to produce n
Rutgers - PHYSICS - 123
THE SECOND LAW OF THERMODYNAMICS2020.1.IDENTIFY: SET UP: EXECUTE: (b) e =For a heat engine, W = QH - QC . e =W . QH &gt; 0, QC &lt; 0. QHW = 2200 J. QC = 4300 J.(a) QH = W + QC = 6500 J.2200 J = 0.34 = 34%. 6500 J EVALUATE: Since the engine
Rutgers - PHYSICS - 123
THE FIRST LAW OF THERMODYNAMICS19The pV-diagram is sketched in Figure 19.119.1.(a) IDENTIFY and SET UP:The pressure is constant and the volume increases.Figure 19.1 (b) W = V2 V1p dVV2 V1Since p is constant, W = p dV = p (V2 - V1 )
Rutgers - PHYSICS - 123
THERMAL PROPERTIES OF MATTER1818.1.(a) IDENTIFY: We are asked about a single state of the system. SET UP: Use Eq.(18.2) to calculate the number of moles and then apply the ideal-gas equation. m 0.225 kg = 56.2 mol EXECUTE: n = tot = M 4.00 10-
Rutgers - PHYSICS - 123
TEMPERATURE AND HEAT1717.1.IDENTIFY and SET UP: EXECUTE:TF = 9 TC + 32. 5(a) TF = (9/5)(-62.8) + 32 = -81.0F(b) TF = (9/5)(56.7) + 32 = 134.1F (c) TF = (9/5)(31.1) + 32 = 88.0F EVALUATE: Fahrenheit degrees are smaller than Celsius degrees
Rutgers - PHYSICS - 123
SOUND AND HEARING1616.1.IDENTIFY and SET UP: Eq.(15.1) gives the wavelength in terms of the frequency. Use Eq.(16.5) to relate the pressure and displacement amplitudes. EXECUTE: (a) = v / f = (344 m/s)/1000 Hz = 0.344 m (b) pmax = BkA and Bk i
Rutgers - PHYSICS - 123
MECHANICAL WAVES1515.1.IDENTIFY: v = f . T = 1/ f is the time for one complete vibration. SET UP: The frequency of the note one octave higher is 1568 Hz. v 344 m/s 1 EXECUTE: (a) = = = 0.439 m . T = = 1.28 ms . f 784 Hz f15.2.v 344 m/s =
Rutgers - PHYSICS - 123
FLUID MECHANICS1414.1.IDENTIFY: SET UP: EXECUTE:Use Eq.(14.1) to calculate the mass and then use w = mg to calculate the weight. = m / V so m = V From Table 14.1, = 7.8 103 kg/m3.For a cylinder of length L and radius R, V = ( R 2 ) L =
Rutgers - PHYSICS - 123
PERIODIC MOTION1313.1.IDENTIFY and SET UP: The target variables are the period T and angular frequency . We are given the frequency f, so we can find these using Eqs.(13.1) and (13.2) EXECUTE: (a) f = 220 HzT = 1/f = 1/220 Hz = 4.54 10-3 s =
Rutgers - PHYSICS - 123
GRAVITATION12Use the law of gravitation, Eq.(12.1), to determine Fg .12.1.IDENTIFY and SET UP: EXECUTE:FS on MGmm mSmM (S = sun, M = moon); FE on M = G E2 M (E = earth) 2 r SM r EM22 FS on M mSmM r EM mS rEM = G 2 = FE on M r
Rutgers - PHYSICS - 123
EQUILIBRIUM AND ELASTICITY1111.1.IDENTIFY: Use Eq.(11.3) to calculate xcm . The center of gravity of the bar is at its center and it can be treated as a point mass at that point. SET UP: Use coordinates with the origin at the left end of the ba
Rutgers - PHYSICS - 123
DYNAMICS OF ROTATIONAL MOTION10EXECUTE: = Fl l = r sin = (4.00 m)sin 90 l = 4.00 m = (10.0 N)(4.00 m) = 40.0 N m10.1.IDENTIFY: Use Eq.(10.2) to calculate the magnitude of the torque and use the right-hand rule illustrated in Fig.(10.4) to
Rutgers - PHYSICS - 123
ROTATION OF RIGID BODIES99.1.9.2.IDENTIFY: s = r , with in radians. SET UP: rad = 180 . s 1.50 m EXECUTE: (a) = = = 0.600 rad = 34.4 r 2.50 m s 14.0 cm (b) r = = = 6.27 cm (128)( rad /180) (c) s = r = (1.50 m)(0.700 rad) = 1.05 m EVALUATE
Rutgers - PHYSICS - 123
MOMENTUM, IMPULSE, AND COLLISIONS88.1.IDENTIFY and SET UP: EXECUTE: (b) (i) v =p = mv. K = 1 mv 2 . 2(a) p = (10,000 kg)(12.0 m/s) = 1.20 105 kg m/sp 1.20 105 kg m/s = = 60.0 m/s . (ii) m 2000 kg1 22 2 mT vT = 1 mSUV vSUV , so 2
Rutgers - PHYSICS - 123
POTENTIAL ENERGY AND ENERGY CONSERVATION77.1.IDENTIFY: SET UP: EXECUTE: EVALUATE:U grav = mgy so U grav = mg ( y2 - y1 )+ y is upward.(a) U = (75 kg)(9.80 m/s 2 )(2400 m - 1500 m) = +6.6 105 J(b) U = (75 kg)(9.80 m/s 2 )(1350 m - 2400 m)
Rutgers - PHYSICS - 123
WORK AND KINETIC ENERGY66.1.6.2.IDENTIFY: Apply Eq.(6.2). SET UP: The bucket rises slowly, so the tension in the rope may be taken to be the bucket's weight. EXECUTE: (a) W = Fs = mgs = (6.75 kg) (9.80 m / s 2 )(4.00 m) = 265 J. (b) Gravity i
Rutgers - PHYSICS - 123
APPLYING NEWTON'S LAWS5Fy5.1.IDENTIFY:a = 0 for each object. Apply= ma y to each weight and to the pulley.SET UP: Take + y upward. The pulley has negligible mass. Let Tr be the tension in the rope and let Tc be the tension in the chain.
Rutgers - PHYSICS - 123
NEWTON'S LAWS OF MOTION44.1.IDENTIFY: Consider the vector sum in each case. ! ! ! ! SET UP: Call the two forces F1 and F2 . Let F1 be to the right. In each case select the direction of F2 such that ! ! ! F = F1 + F2 has the desired magnitude. E
Rutgers - PHYSICS - 123
MOTION IN TWO OR THREE DIMENSIONS3tan =3.1.IDENTIFY and SET UP: Use Eq.(3.2), in component form. x x2 - x1 5.3 m - 1.1 m = = = 1.4 m/s EXECUTE: ( vav ) x = t t2 - t1 3.0 s - 0( vav ) y =y y2 - y1 -0.5 m - 3.4 m = = = -1.3 m/s t t2 - t1 3.
Rutgers - PHYSICS - 123
MOTION ALONG A STRAIGHT LINE2x . t2.1.IDENTIFY: SET UP:The average velocity is vav-x =Let + x be upward. 1000 m - 63 m EXECUTE: (a) vav-x = = 197 m/s 4.75 s 1000 m - 0 (b) vav-x = = 169 m/s 5.90 s EVALUATE:2.2.63 m - 0 = 54.8 m/s . Whe
Rutgers - PHYSICS - 123
UNITS, PHYSICAL QUANTITIES AND VECTORS11.1.IDENTIFY: Convert units from mi to km and from km to ft. SET UP: 1 in. = 2.54 cm , 1 km = 1000 m , 12 in. = 1 ft , 1 mi = 5280 ft . 5280 ft 12 in. 2.54 cm 1 m 1 km EXECUTE: (a) 1.00 mi = (1.00 mi
Cal Poly - PHYS - 130 series
Chapter 1, Solution 1 (a) q = 6.482x1017 x [-1.602x10-19 C] = -0.10384 C (b) q = 1. 24x1018 x [-1.602x10-19 C] = -0.19865 C (c) q = 2.46x1019 x [-1.602x10-19 C] = -3.941 C (d) q = 1.628x1020 x [-1.602x10-19 C] = -26.08 C Chapter 1, Solution 2 (a) (b)
Cal Poly - PHYS - 130 series
Chapter 2, Solution 1 v = iR i = v/R = (16/5) mA = 3.2 mAChapter 2, Solution 2 p = v2/R Chapter 2, Solution 3 R = v/i = 120/(2.5x10-3) = 48k ohms Chapter 2, Solution 4 (a) (b) i = 3/100 = 30 mA i = 3/150 = 20 mA R = v2/p = 14400/60 = 240 ohmsCha
Cal Poly - PHYS - 130 series
Chapter 3, Solution 1. v18 2 40 v26A10 AAt node 1, 6 = v1/(8) + (v1 - v2)/4 At node 2, v1 - v2/4 = v2/2 + 10 Solving (1) and (2), v1 = 9.143V, v2 = -10.286 V2 v1 (9.143)2 P8 = = = 10.45 W 8 848 = 3v1 - 2v2(1)40 = v1 - 3v2(2)P4 =
Cal Poly - PHYS - 130 series
Chapter 4, Solution 1. 1 i 5 io1V+ -838 (5 + 3) = 4 , i =1 1 = 1+ 4 5io =1 1 i= = 0.1A 2 10Chapter 4, Solution 2.6 (4 + 2) = 3, i1 = i 2 =1 A 25 4io =1 1 i1 = , v o = 2i o = 0.5V 2 4i1ioi2 1A 8 6 2If is = 1A, then vo
Arizona - MATH - 125
5.1 SOLUTIONS315CHAPTER FIVESolutions for Section 5.1Exercises1. (a) Lower estimate = (45)(2) + (16)(2) + (0)(2) = 122 feet. Upper estimate = (88)(2) + (45)(2) + (16)(2) = 298 feet. v (b)80 60 40 20 t2462. (a) Since the velocity is de
Arizona - MATH - 125
6.1 SOLUTIONS363CHAPTER SIXSolutions for Section 6.1Exercises1. See Figure 6.1.F (0) = 1 1 F (0) = 1 1x 1 F (0) = 0 1 F (0) = 0 xFigure 6.1 2. See Figure 6.2. 3. See Figure 6.3.1 F (0) = 1 1 x 1 F (0) = 0Figure 6.2F (0) = 1F (0) =
Arizona - MATH - 125
7.1 SOLUTIONS407CHAPTER SEVENSolutions for Section 7.1Exercises1. (a) We substitute w = 1 + x2 , dw = 2x dx.x=1 x=0x 1 dx = 1 + x2 2w=2 w=11 1 dw = ln |w| w 22=11 ln 2. 2(b) We substitute w = cos x, dw = - sin x dx.x= 4 x=0
Cal Poly - ME - 212
INSTRUCTOR'S MANUAL To Accompany ENGINEERING MECHANICS - DYNAMICS Volume 2 Fifth Edition, 2002 J. L. Meriam and L. G. Kraige Copyright 2002 by John Wiley &amp; Sons, Inc.USE OF THE INSTRUCTOR'S MANUAL The problem solution portion of this manual has be
WVU - MAE - 244
1Tension, Compression, and ShearNormal Stress and StrainProblem 1.2-1 A solid circular post ABC (see figure) supports a load P1 2500 lb acting at the top. A second load P2 is uniformly distributed around the shelf at B. The diameters of the upper
WVU - MAE - 244
32CHAPTER 1Tension, Compression, and ShearProblem 1.6-10 A flexible connection consisting of rubber pads (thickness t 9 mm) bonded to steel plates is shown in the figure. The pads are 160 mm long and 80 mm wide. (a) Find the average shear strai
WVU - MAE - 244
106CHAPTER 2Axially Loaded MembersProblem 2.5-3 A rigid bar of weight W 750 lb hangs from three equally spaced wires, two of steel and one of aluminum (see figure). The diameter of the wires is 1/8 in. Before they were loaded, all three wires h
WVU - MAE - 244
122CHAPTER 2Axially Loaded MembersStresses on Inclined SectionsProblem 2.6-1 A steel bar of rectangular cross section (1.5 in. 2.0 in.) carries a tensile load P (see figure). The allowable stresses in tension and shear are 15,000 psi and 7,000
WVU - MAE - 244
134CHAPTER 2Axially Loaded MembersProblem 2.6-16 A prismatic bar is subjected to an axial force that produces a tensile stress 63 MPa and a shear stress 21 MPa on a certain inclined plane (see figure). Determine the stresses acting on all faces
WVU - MAE - 244
144CHAPTER 2Axially Loaded MembersProblem 2.7-9 A slightly tapered bar AB of rectangular cross section and length L is acted upon by a force P (see figure). The width of the bar varies uniformly from b2 at end A to b1 at end B. The thickness t
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CHAPTER TWO SOLUTIONS 1. (a) 12 s (b) 750 mJ (c) 1.13 k (d) 3.5 Gbits (e) 6.5 nm (f) 13.56 MHz (g) 39 pA (h) 49 k (i) 11.73 pAEngineering Circuit Analysis, 6th EditionCopyright 2002 McGraw-Hill, Inc. All Rights Reserved.CHAPTER TWO SOLUTIONS2
WVU - MAE - 320
CHAPTER THREE SOLUTIONS 1.Engineering Circuit Analysis, 6th EditionCopyright 2002 McGraw-Hill, Inc. All Rights Reserved.CHAPTER THREE SOLUTIONS 2. (a) six nodes; (b) nine branches.Engineering Circuit Analysis, 6th EditionCopyright 2002 McGr
WVU - EE - 221
CHAPTER FOUR SOLUTIONS 1. (a) 0.1 -0.5 -0.2 -0.3 0.1 -0.3 -0.4 0 0.4 v1 v2 v3 0 4 6=Solving this matrix equation using a scientific calculator, v2 = -8.387 V (b) Using a scientific calculator, the determinant is equal to 32.Engineering Circuit
WVU - MAE - 320
CHAPTER FIVE SOLUTIONS 1. Define percent error as 100 [ex (1 + x)]/ ex x 0.001 0.005 0.01 0.05 0.10 0.50 1.00 5.00 1+x 1.001 1.005 1.01 1.05 1.10 1.50 2.00 6.00 ex 1.001 1.005 1.010 1.051 1.105 1.649 2.718 148.4 % error 510-5 110-3 510-3 0.1 0.5 9 2
WVU - MAE - 320
CHAPTER SIX SOLUTIONS 1. The first step is to perform a simple source transformation, so that a 0.15-V source in series with a 150- resistor is connected to the inverting pin of the ideal op amp. Then, vout = - 2200 (0.15) = - 2.2 V 150Engineering
WVU - MAE - 320
CHAPTER SEVEN SOLUTIONS1.(a) C =A 8.854 10 -12 (78.54 10 -6 ) = = 6.954 pF d 100 10 - 61 2E 2( 10 - 3 ) 1 CV 2 V = = = 16.959kV 2 C 6.954 10 -12(b) Energy , E =(c) E =1 2 E 2(2.5 10 -6 ) CV 2 C = 2 = = 500 pF 2 (100 2 ) VC=A Cd
WVU - MAE - 320
CHAPTER EIGHT SOLUTIONS 1. (a)iL (0) =100 = 2A iL (t ) = 2e -80t / 0.2 50 -400 t = 2e A, t &gt; 0(b) (c)iL (0.01) = 2e-4 = 36.63mA 2e -400t1 = 1, e400t1 = 2, t1 = 1.7329msEngineering Circuit Analysis, 6th EditionCopyright 2002 McGraw-Hill,
WVU - MAE - 320
CHAPTER NINE SOLUTIONS 1. o L = 10, s1 = -6s -1 , s2 = -8s -12 2 -6 = + 2 - o , - 8 = - - 2 - o adding,-14 = -2 = 7 s -12 2 -6 = -7 + 49 - o o = 481 , o = 6.928 LCrad/s 6.928 L = 10, L = 1.4434H, 1 1 C= = 14.434mF, = 7 R = 4.949 4
WVU - MAE - 320
CHAPTER TEN (Phasor Analysis) SOLUTIONS 1. (a) 2103 = 290.9t rad/s 21.6 f (t ) = 8.5sin (290.9t + ) 0 = 8.5sin (290.9 2.110 -3 + ) T = 4 (7.5 - 2.1)10-3 = 21.6 10-3 , = = -0.6109rad + 2 = 5.672rad or 325.0 f (t ) = 8.5sin (290.9t + 325.0) (b