College Physics
2nd Edition
ISBN: 9780134601823
Author: ETKINA, Eugenia, Planinšič, G. (gorazd), Van Heuvelen, Alan
Publisher: Pearson,
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Chapter 18, Problem 25CQ
What is the dielectric constant of a metal?
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Part A:
kg
(a) Water at 20 °C (p = 998.3 and v = 1 × 10-6 m²/s) flows through a galvanised
m³
iron pipe (k = 0.15 mm) with a diameter of 25 mm, entering the room at point A and
discharging at point C from the fully opened gate valve B at a volumetric flow rate of
0.003 m³/s. Determine the required pressure at A, considering all the losses that occur
in the system described in Figure Q1. Loss coefficients for pipe fittings have been
provided in Table 1.
[25 marks]
(b) Due to corrosion within the pipe, the average flow velocity at C is observed to be
V2 m/s after 10 years of operation whilst the pressure at A remains the same as
determined in (a). Determine the average annual rate of growth of k within the pipe.
[15 marks]
4₁
Figure Q1. Pipe system
Page 2
25 mm
For an independent study project, you design an experiment to measure the speed of light. You propose to bounce laser light off a mirror that is 53.5 km due east and have it detected by a light sensor that is 119 m due south of the laser. The first problem is to orient the mirror so that the laser light reflects off the mirror and into the light sensor.
(a) Determine the angle that the normal to the mirror should make with respect to due west.(b) Since you can read your protractor only so accurately, the mirror is slightly misaligned and the actual angle between the normal to the mirror and due west exceeds the desired amount by 0.003°. Determine how far south you need to move the light sensor in order to detect the reflected laser light.
A mirror hangs 1.67 m above the floor on a vertical wall. A ray of sunlight, reflected off the mirror, forms a spot on the floor 1.41 m from the wall. Later in the day, the spot has moved to a point 2.50 m from the
wall.
(a) What is the change in the angle of elevation of the Sun, between the two observations?
Chapter 18 Solutions
College Physics
Ch. 18 - Review Question 18.1 How do you estimate the...Ch. 18 - Review Question 18.2 You have a point-like object...Ch. 18 - Review Question 18.3 Compare the work needed to...Ch. 18 - Review Question 18.4 Imagine that you have an...Ch. 18 - Review Question 18.5 In this section you read that...Ch. 18 - Review Question 18.6 What are the differences...Ch. 18 - Review Question 18.7 A parallel plate capacitor...Ch. 18 - Review Question 18.8 Why do heart contractions...Ch. 18 - 1 What does the field at point A, which is a...Ch. 18 - Why can you shield an object from an external...
Ch. 18 - If you place a block made of a conducting material...Ch. 18 - 4. If you place a block made of a dielectric...Ch. 18 - 5. Two identical positive charges are located at a...Ch. 18 - An electric dipole is placed between the...Ch. 18 - 7. A positive charge is fixed at some distance d...Ch. 18 - Figure Q18.8 shows E field lines in a region of...Ch. 18 - How do we use the model of the electric field to...Ch. 18 - Describe a procedure to determine the E field at...Ch. 18 - What does it mean if the E field at a certain...Ch. 18 - A very small positive charge is placed at one...Ch. 18 - 13. How do we create an E field with parallel...Ch. 18 - 14. Draw a sketch of the field lines caused by...Ch. 18 - 15. Draw a sketch of the field lines caused by...Ch. 18 - 16. Jim thinks that E field lines are the paths...Ch. 18 - Can E field lines cross? Explain why or why not.Ch. 18 - An electron moving horizontally from left to right...Ch. 18 - 19. (a) What does it mean if the electric...Ch. 18 - 20. Explain how grounding works.
Ch. 18 - 21. Explain how shielding works.
Ch. 18 - 22. Explain the difference between the microscopic...Ch. 18 - Explain why, for charged objects submerged in a...Ch. 18 - 24. What does it mean if the dielectric constant k...Ch. 18 - What is the dielectric constant of a metal?Ch. 18 - Describe the relation between the quantities E...Ch. 18 - If the V field in a region is constant, what is...Ch. 18 - 28. Why are uncharged pieces of a dielectric...Ch. 18 - 29. Draw equipotential surfaces and label them in...Ch. 18 - Show a charge arrangement and a point in space...Ch. 18 - 31. Explain what happens when you place a...Ch. 18 - (a) Explain what happens when you place a...Ch. 18 - 33. Explain why the excess charge on an electrical...Ch. 18 - Draw a microscopic representation of the charge...Ch. 18 - 1. * (a) Construct a graph of the magnitude of the...Ch. 18 - * A uranium nucleus has 92 protons. (a) Determine...Ch. 18 - 3. The electron and the proton in a hydrogen atom...Ch. 18 - * Use the superposition principle to draw E field...Ch. 18 - 5. * Use the superposition principle to draw ...Ch. 18 - * E field lines for a field created by an...Ch. 18 - 7. * Two objects with charges C are 50 cm from...Ch. 18 - 8. * charged object is 6.0 cm along a horizontal...Ch. 18 - 9. ** charged object is 4.0 cm along a horizontal...Ch. 18 - 10. **A distance d separates two objects, each...Ch. 18 - 11. * A point-like charged object with a charge +...Ch. 18 - 12. * A 3.0-g aluminum foil ball with a charge of ...Ch. 18 - 13. ** (a) If the string in the previous problem...Ch. 18 - * EST Using Earths E field for flight Earth has an...Ch. 18 - * An electron moving with a speed v0 enters a...Ch. 18 - 10-9 C hangs freely from a 1.0-m-long thread. What...Ch. 18 - 17. A 0.50-g oil droplet with charge is in a...Ch. 18 - 19. * Equation Jeopardy 1 The equations below...Ch. 18 - * Equation Jeopardy 2 The equations below describe...Ch. 18 - 21. During a lightning flash. of charge moves...Ch. 18 - 22. * (a) Construct a graph of the V field created...Ch. 18 - * A horizontal distance d separates two objects...Ch. 18 - * Two objects with charges qand+q are separated by...Ch. 18 - * Four objects with the same charge q are placed...Ch. 18 - 26. Spark jumps to nose An electric spark jumps...Ch. 18 - 27. * Two charged point-like objects are...Ch. 18 - BIO Electric field in body cell The electric...Ch. 18 - * Equation Jeopardy 3 The equation below describes...Ch. 18 - 31. * Equation Jeopardy 4 The equation below...Ch. 18 - 32. * While a sphere with positive charge remains...Ch. 18 - 33. * Figure P18.33 shows field lines in a region...Ch. 18 - 34. * A metal sphere has no charge on it. A...Ch. 18 - 35. ** EST A Van de Graaff generator of radius...Ch. 18 - ** A metal ball of radius R1 has a charge Q. Later...Ch. 18 - 37. * Positively charged metal sphere A is placed...Ch. 18 - *Two small metal spheres A and B have different...Ch. 18 - 39. * An electric dipole such as a water molecule...Ch. 18 - 10-7C at its head and an equal magnitude negative...Ch. 18 - 41. BIO Body cell membrane electric field (a)...Ch. 18 - 42. ** Earth's electric field Earth has an...Ch. 18 - 43. You have a parallel plate capacitor. (a)...Ch. 18 - 44. * A capacitor of capacitance C with a vacuum...Ch. 18 - 45. * A capacitor of capacitance C with a vacuum...Ch. 18 - How does the capacitance of a parallel plate...Ch. 18 - BIO EST Axon capacitance The long thin cylindrical...Ch. 18 - 48. ** Sphere capacitance A metal sphere of radius...Ch. 18 - * BIO EST Capacitance of red blood cell Assume...Ch. 18 - BIO Defibrillator During ventricular fibrillation...Ch. 18 - * EST The dielectric strength of air is 3106V/m....Ch. 18 - * Charged cloud causes electric field on Earth The...Ch. 18 - *BIO Hearts dipole charge The heart has a dipole...Ch. 18 - 55. * In a hot water heater, water warms when...Ch. 18 - 56. ** EST Lightning warms water A lightning flash...Ch. 18 - 57 * Four charged particles A, B, C, and D are...Ch. 18 - 59. ** A small object of unknown mass and charge...Ch. 18 - 61. * BIO Electrophoresis Electrophoresis is used...Ch. 18 - 62. * BIO Energy stored in axon electric field An...Ch. 18 - BIO Electric discharge by eels In several aquatic...Ch. 18 - BIO Electric discharge by eels In several aquatic...Ch. 18 - BIO Electric discharge by eels In several aquatic...Ch. 18 - BIO Electric discharge by eels In several aquatic...Ch. 18 - BIO Electric discharge by eels In several aquatic...Ch. 18 - BIO Electric discharge by eels In several aquatic...Ch. 18 - Electrostatic precipitator (esp) Electrostatic...Ch. 18 - Electrostatic precipitator (esp) Electrostatic...Ch. 18 - Electrostatic precipitator (esp) Electrostatic...Ch. 18 - Electrostatic precipitator (esp) Electrostatic...Ch. 18 - Electrostatic precipitator (esp) Electrostatic...
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