CAPA 5 winter 2014 MOORE
Mlanie LaRoche-Boisvert - Electromagnetism Electromagnetism and Optics - Winter 2014 - PH
1
Notes: 1. To submit a problem, just click the ”Submit” button under it.
Mlanie LaRoche-Boisvert - Electromagnetism Electromagnetism and Optics - Winter 2014 - PH
2
What is the equivalent resistance, in ohms, of the following circuit with R = 57.0 Ω ?
The ”Submit All” button is not necessary. 2. A problem accepted as correct by CAPA will be highlighted in green. Once you see this, your problem has been submitted and accepted as correct.
3. If you are trying to obtain the correct number of significant digits, use the ’E’ notation. I.e. 44+56 = 100. is wrong, but 45 + 56 = 1.0e2 is right in the number of significant digits. 4. Use period ”.” to denote decimal point. comma ”,” doesn’t work here.
5. You are encouraged to solve all the problems independently. For questions about the assignment itself, please consult one of your tutors. If you have any questions about the capa system, don’t hesitate to contact [email protected], i’ll be glad to help you.
Good Luck!
Problem Weight is: 1 You are correct. Your receipt is 151-6740
Problem 1
Problem 3
A current of 3.00 A is maintained in a simple circuit with a total resistance of 3.00 Ω. How much heat is generated in 2.50 s?
Four resistors, with R1 = 5.00 Ω, R2 = 8.00 Ω, R3 = 8.00 Ω, R4 = 12.00 Ω are connected as shown in the figure. We want a current of I2 = 8.00 A to flow through resistor R2 . What potential difference must be applied across the external terminals?
Problem Weight is: 1
R3
You are correct. Your receipt is 151-8524 R4
Problem 2 R2
R1
Problem Weight is: 1 You are correct. Your receipt is 151-1932 Problem 4
Mlanie LaRoche-Boisvert - Electromagnetism Electromagnetism and Optics - Winter 2014 - PH
3
Suppose you need to install two heaters, which will be powered by conventional residential power, i.e. V=120. V, and are to be controlled by a single on-off switch. Each heater works by dissipating power in a resistor. The first heater, with resistance R1, is to produce P1=440. W. The second, with resistance R2, is to produce P2=1160 W.
a) If the two heaters are to be wired in series, what should R1 and R2 be? (Enter your answer for R1 first.) You are correct. Your receipt is 151-4838 b) If the two heaters are to be wired in parallel, what should R1 and R2 be?
Mlanie LaRoche-Boisvert - Electromagnetism Electromagnetism and Optics - Winter 2014 - PH
4
The rod in the figure below (not drawn to scale) is made of two materials.
Both have a square cross section of 3.19mm on a side. The first material has a resistivity of 4.42 × 10−3 Ω·m and is L1 = 22.0cm long, while the second material has a resistivity of 6.36 × 10−3 Ω·m and is L2 = 40.8cm long. What is the resistance between the ends of the rod? You are correct. Your receipt is 151-3510 Problem 7
You are correct. Your receipt is 151-4653 Problem 5 A hair dryer consumes P=1400 Watts of power from a 120 V wall plug. a) What current does the hairdryer draw? You are correct. Your receipt is 151-5360 b) The current is carried from the breaker box to the power outlet by a 14-gauge copper wire, with diameter D1=1.628 mm. The wire runs a distance L=20.0 m from the box to the outlet and the same distance back. The resistivity of copper is ρ=\ensuremath{1.680\times 10ˆ{-8}} Ωm. How much power is consumed due to the resistance of the wire? You are correct. Your receipt is 151-8293 c) Suppose the above ratio of power consumed by devices to power consumed by wires is typical in the house. If the house spends $1,800 per year in electricity bills, how much money can be saved per year by rewiring the house with 12-gauge wire, with diameter D2=2.053 mm? (Give your answer in dollars, but do not write ’$’)
A high-voltage transmission line with a diameter of 1.59 cm and a length of 205. km carries a steady current of 1050. A. If the conductor is copper wire with a free charge density of 7.87 × 1028 electrons/m3, how long does it take one electron to travel the full length of the cable?
You are correct. Your receipt is 151-2252 Problem 8 Two resistors connected in series have an equivalent resistance of 659. Ω. When they are connected in parallel, their equivalent resistance is 131. Ω. Calculate the resistance of each resistor. Enter the smaller one first.
You are correct. Your receipt is 151-2426 Problem Set End. You do not need to hit the ”Submit All” button below this line if you have already clicked ”submit” for each individual field.
You are correct. Your receipt is 151-4107 Problem 6 c Printed from LON-CAPA MSU
Licensed under GNU General Public License
1
Notes: 1. To submit a problem, just click the ”Submit” button under it.
Mlanie LaRoche-Boisvert - Electromagnetism Electromagnetism and Optics - Winter 2014 - PH
2
What is the equivalent resistance, in ohms, of the following circuit with R = 57.0 Ω ?
The ”Submit All” button is not necessary. 2. A problem accepted as correct by CAPA will be highlighted in green. Once you see this, your problem has been submitted and accepted as correct.
3. If you are trying to obtain the correct number of significant digits, use the ’E’ notation. I.e. 44+56 = 100. is wrong, but 45 + 56 = 1.0e2 is right in the number of significant digits. 4. Use period ”.” to denote decimal point. comma ”,” doesn’t work here.
5. You are encouraged to solve all the problems independently. For questions about the assignment itself, please consult one of your tutors. If you have any questions about the capa system, don’t hesitate to contact [email protected], i’ll be glad to help you.
Good Luck!
Problem Weight is: 1 You are correct. Your receipt is 151-6740
Problem 1
Problem 3
A current of 3.00 A is maintained in a simple circuit with a total resistance of 3.00 Ω. How much heat is generated in 2.50 s?
Four resistors, with R1 = 5.00 Ω, R2 = 8.00 Ω, R3 = 8.00 Ω, R4 = 12.00 Ω are connected as shown in the figure. We want a current of I2 = 8.00 A to flow through resistor R2 . What potential difference must be applied across the external terminals?
Problem Weight is: 1
R3
You are correct. Your receipt is 151-8524 R4
Problem 2 R2
R1
Problem Weight is: 1 You are correct. Your receipt is 151-1932 Problem 4
Mlanie LaRoche-Boisvert - Electromagnetism Electromagnetism and Optics - Winter 2014 - PH
3
Suppose you need to install two heaters, which will be powered by conventional residential power, i.e. V=120. V, and are to be controlled by a single on-off switch. Each heater works by dissipating power in a resistor. The first heater, with resistance R1, is to produce P1=440. W. The second, with resistance R2, is to produce P2=1160 W.
a) If the two heaters are to be wired in series, what should R1 and R2 be? (Enter your answer for R1 first.) You are correct. Your receipt is 151-4838 b) If the two heaters are to be wired in parallel, what should R1 and R2 be?
Mlanie LaRoche-Boisvert - Electromagnetism Electromagnetism and Optics - Winter 2014 - PH
4
The rod in the figure below (not drawn to scale) is made of two materials.
Both have a square cross section of 3.19mm on a side. The first material has a resistivity of 4.42 × 10−3 Ω·m and is L1 = 22.0cm long, while the second material has a resistivity of 6.36 × 10−3 Ω·m and is L2 = 40.8cm long. What is the resistance between the ends of the rod? You are correct. Your receipt is 151-3510 Problem 7
You are correct. Your receipt is 151-4653 Problem 5 A hair dryer consumes P=1400 Watts of power from a 120 V wall plug. a) What current does the hairdryer draw? You are correct. Your receipt is 151-5360 b) The current is carried from the breaker box to the power outlet by a 14-gauge copper wire, with diameter D1=1.628 mm. The wire runs a distance L=20.0 m from the box to the outlet and the same distance back. The resistivity of copper is ρ=\ensuremath{1.680\times 10ˆ{-8}} Ωm. How much power is consumed due to the resistance of the wire? You are correct. Your receipt is 151-8293 c) Suppose the above ratio of power consumed by devices to power consumed by wires is typical in the house. If the house spends $1,800 per year in electricity bills, how much money can be saved per year by rewiring the house with 12-gauge wire, with diameter D2=2.053 mm? (Give your answer in dollars, but do not write ’$’)
A high-voltage transmission line with a diameter of 1.59 cm and a length of 205. km carries a steady current of 1050. A. If the conductor is copper wire with a free charge density of 7.87 × 1028 electrons/m3, how long does it take one electron to travel the full length of the cable?
You are correct. Your receipt is 151-2252 Problem 8 Two resistors connected in series have an equivalent resistance of 659. Ω. When they are connected in parallel, their equivalent resistance is 131. Ω. Calculate the resistance of each resistor. Enter the smaller one first.
You are correct. Your receipt is 151-2426 Problem Set End. You do not need to hit the ”Submit All” button below this line if you have already clicked ”submit” for each individual field.
You are correct. Your receipt is 151-4107 Problem 6 c Printed from LON-CAPA MSU
Licensed under GNU General Public License
