SHM, Waves, Thermo, E&M Practice Problem Workbook

More documents

Recommendations

Info

10 Ω MECHANICS PRACTICE PROBLEM SETS 41 120 V 25 Ω 30 Ω 12. A standard 100-W incandescent light bulb has a filament made out of tungsten. At room temperature (20°C), the tungsten filament has a resistance of 15 Ω. When the 15 Ω light bulb operating with a wall voltage of 120 V, it gets hot. What is the temperature of the filament when it is hot The temperature coefficient of tungsten is 0.0044°C -1 40 Ω . Answer: 1975°C 20 Ω 13. Find the equivalent resistance and the current through the battery for each of the following combination circuits. a. R eq = 27.1 Ω; I B = 4.4 A b. R eq = 128.8 Ω; I B = 0.93 A Gamzon & Gregorian-Michaelsen 6/13/12
MECHANICS PRACTICE PROBLEM SETS 42 Unit 11 MAGNETISM 11.1 MAGNETISM 1. Use the right-hand rule to find the direction of the current in a wire in a magnetic field that results in the force on the wire shown for each case shown below: 2. A 50 cm long, straight wire conducts 4.0 A of current upward. The wire experiences a force of 1.0 x 10 -2 N when in a magnetic field that is perpendicular to the wire. What is the magnetic field around the wire Answer: 0.005 T 3. A magnetic field of 1.0 x 10 -4 T at 30° North of West acts on a 1.0 m wire that carries a current of 15 A to the west. What is the magnitude and direction of the magnetic force on the wire Answer: 7.5 x 10 -4 N into the page 4. A wire with a length of 2.7 m and a mass of 0.89 kg is in a region of space with a magnetic field of 0.72 T. What is the minimum current needed to levitate the wire Answer: 4.5 A 5. You want to produce a magnetic field with a magnitude of 5.50 x 10 -4 T at a distance of 0.040 m from a long, straight wire. a. What current is required to produce this field Answer: 110 A b. What is the magnitude of the field located at a distance of 0.080 m and 0.160 m Answer: 2.75 x 10 -4 T; 1.38 x 10 -4 6. Two hikers are reading a compass under an overhead transmission line that is 5.50 m above the grand and carries a current of 800 A in a horizontal direction from north to south. What is the magnitude and direction of the magnetic field at a point directly under the conductor Answer: 2.91 x 10 -5 east 7. Two, straight, parallel, 1.0 m superconducting cables 4.5 mm apart carry equal currents of 15,000 A in opposite directions. What is the force on each wire and what type of force is it Answer: 10,000 N repulsive 8. Two long, parallel wires that are each 1.20 meters long are separated by a distance of 2.50 cm. The force each wire exerts on the other is 4.80 x 10 -5 N. The wires attract each other. The current in one wire is 0.600 A. What is the current in the Gamzon & Gregorian-Michaelsen 6/13/12
Page 1: ACTIVITY BASED PHYSICS SHM, WAVES,
Page 4 and 5: MECHANICS PRACTICE PROBLEM SETS 1 U
Page 6 and 7: MECHANICS PRACTICE PROBLEM SETS 3 b
Page 8 and 9: MECHANICS PRACTICE PROBLEM SETS 5 7
Page 10 and 11: Substances MECHANICS PRACTICE PROBL
Page 12 and 13: L Answer: MECHANICS PRACTICE PROBLE
Page 14 and 15: MECHANICS PRACTICE PROBLEM SETS 11

SHM, Waves, Thermo, E&M Practice Problem Workbook

Create successful ePaper yourself

Delete template?

Save as template?