A physics student has a single-occupancy dorm room. The student has a small refrigerator that runs with a current 1 A, a lamp that contains a 100-W bulb, an overhead light with a 60-W bulb, and various other small devices adding up to 4 W. All the appliances run on a voltage of 110 V. Overall Hint a. What is the total power used by the dorm room (while the refrigerator runs)? Total power used by the dorm room is 274 b. Assuming that the power plant for the electricity is 19 km away and uses 000-gauge copper wire (diameter 10.405 mm), how much power is dissipated in transmission (remember to count the return wire), if the power plant is directly providing the 110-V? (To be more precise, the power plant is providing the voltage it needs to provide, so that the voltage at the dorm room is 110 V.) Hint for part (b) Power of 46.54 W is dissipated in transmission at 110 V. c. The most common way to increase the efficiency of power transmission is by using higher voltage for long-distance transmission (and it is "down transformed" nearer the consumers of electricity). Assuming that the same amount of power calculated in (a) is transmitted, how much power is dissipated in transmission, if the power plant provides the power at 110 kV? (To be more precise, the power plant is providing the voltage it needs to provide, so that the voltage at the transformer station is 110 kV.) Hint for part (c) ✔W. Power of W is dissipated in transmission at 110 kV.
A physics student has a single-occupancy dorm room. The student has a small refrigerator that runs with a current 1 A, a lamp that contains a 100-W bulb, an overhead light with a 60-W bulb, and various other small devices adding up to 4 W. All the appliances run on a voltage of 110 V. Overall Hint a. What is the total power used by the dorm room (while the refrigerator runs)? Total power used by the dorm room is 274 b. Assuming that the power plant for the electricity is 19 km away and uses 000-gauge copper wire (diameter 10.405 mm), how much power is dissipated in transmission (remember to count the return wire), if the power plant is directly providing the 110-V? (To be more precise, the power plant is providing the voltage it needs to provide, so that the voltage at the dorm room is 110 V.) Hint for part (b) Power of 46.54 W is dissipated in transmission at 110 V. c. The most common way to increase the efficiency of power transmission is by using higher voltage for long-distance transmission (and it is "down transformed" nearer the consumers of electricity). Assuming that the same amount of power calculated in (a) is transmitted, how much power is dissipated in transmission, if the power plant provides the power at 110 kV? (To be more precise, the power plant is providing the voltage it needs to provide, so that the voltage at the transformer station is 110 kV.) Hint for part (c) ✔W. Power of W is dissipated in transmission at 110 kV.
Principles of Physics: A Calculus-Based Text
5th Edition
ISBN:9781133104261
Author:Raymond A. Serway, John W. Jewett
Publisher:Raymond A. Serway, John W. Jewett
Chapter21: Current And Direct Current Circuits
Section: Chapter Questions
Problem 42P
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Can I please get help for part C in the first picture, and all of second picture. Please and thank you!
Transcribed Image Text:2
Consider two positive charges Q1 and Q2 of the same magnitude 8.5 µC symmetrically placed on the x-axis
at x = 12 cm. Consider a third positive charge Q3 of magnitude 8 µC and mass 2.5 g moving along the y-
axis. Where applicable, let the potential energy be zero when charges are very far apart from each other.
Hint
a. What is the potential energy of Q3 when it is at y = 3 cm?
Hint for (a)
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b. If Q3 is released from rest at y = 3 cm, how fast is it moving when it reaches y = 7.8 cm?
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Transcribed Image Text:#
A physics student has a single-occupancy dorm room. The student has a small refrigerator that runs with a
current 1 A, a lamp that contains a 100-W bulb, an overhead light with a 60-W bulb, and various other
small devices adding up to 4 W. All the appliances run on a voltage of 110 V.
Overall Hint
a. What is the total power used by the dorm room (while the refrigerator runs)?
Total power used by the dorm room is 274
b. Assuming that the power plant for the electricity is 19 km away and uses 000-gauge copper wire
(diameter 10.405 mm), how much power is dissipated in transmission (remember to count the return
wire), if the power plant is directly providing the 110-V? (To be more precise, the power plant is
providing the voltage it needs to provide, so that the voltage at the dorm room is 110 V.)
Hint for part (b)
# 3
E
Power of 46.54
W is dissipated in transmission at 110 V.
c. The most common way to increase the efficiency of power transmission is by using higher voltage for
long-distance transmission (and it is "down transformed" nearer the consumers of electricity).
Assuming that the same amount of power calculated in (a) is transmitted, how much power is
dissipated in transmission, if the power plant provides the power at 110 kV? (To be more precise, the
power plant is providing the voltage it needs to provide, so that the voltage at the transformer
station is 110 kV.)
Hint for part (c)
Power of
Question Help: Message instructor
Submit Question
80
F3
54
$
4
R
F4
67 5⁰
%
5
F5
T
W is dissipated in transmission at 110 kV.
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