(e) What is the resistivity of this wire at 30.0°C? 7.20 A copper wire has a length of 0.500 m and a diameter of 1.00 mm at creases to 30.0°C. vesistance of this wire at 15.0°C? ais gth of this wire at 30.0°C? i besiq (a cross-sectional area of this wire at 30.0°C? what is the resistance of this wire at 30.0°C, considering the new resistivity and the new physical dimensions of this resistor? (8) Calculate the resistance of this wire at 30.0°C using the new resistivity and the old dimensions of the wire. (This is the same as using the equation for R from Problem 6.23.) (h) Compare your answers to parts (f) and (g). Is it a valid approximation to ignore the changes in the physical dimensions of the wire? 7.21 In the morning, when the temperature is 45.0°F, you fill up a steel tanker truck (completely) with 1400.0 gal of gasoline. As you drive the gasoline to its destination, the temperature increases to 75.0°F. How many gallons of gasoline will overflow due to thermal expansion? .. .. 7.22 After having your gasoline overflow in the previous problem, you decide to shop smarter the following day. What is the maximum amount of gasoline you can place in your tanker truck for it not to overflow, if the temperature rises from 45.0°F to 75.0°F as it did before?
(e) What is the resistivity of this wire at 30.0°C? 7.20 A copper wire has a length of 0.500 m and a diameter of 1.00 mm at creases to 30.0°C. vesistance of this wire at 15.0°C? ais gth of this wire at 30.0°C? i besiq (a cross-sectional area of this wire at 30.0°C? what is the resistance of this wire at 30.0°C, considering the new resistivity and the new physical dimensions of this resistor? (8) Calculate the resistance of this wire at 30.0°C using the new resistivity and the old dimensions of the wire. (This is the same as using the equation for R from Problem 6.23.) (h) Compare your answers to parts (f) and (g). Is it a valid approximation to ignore the changes in the physical dimensions of the wire? 7.21 In the morning, when the temperature is 45.0°F, you fill up a steel tanker truck (completely) with 1400.0 gal of gasoline. As you drive the gasoline to its destination, the temperature increases to 75.0°F. How many gallons of gasoline will overflow due to thermal expansion? .. .. 7.22 After having your gasoline overflow in the previous problem, you decide to shop smarter the following day. What is the maximum amount of gasoline you can place in your tanker truck for it not to overflow, if the temperature rises from 45.0°F to 75.0°F as it did before?
Physics for Scientists and Engineers: Foundations and Connections
1st Edition
ISBN:9781133939146
Author:Katz, Debora M.
Publisher:Katz, Debora M.
Chapter28: Current And Resistance
Section: Chapter Questions
Problem 68PQ
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Question 7.21 only
Transcribed Image Text:(e) What is the resistivity of this wire at 30.0°C?
7.20 A copper wire has a
length of 0.500 m and a diameter of 1.00 mm at
creases to 30.0°C.
vesistance of this wire at 15.0°C?
ais
gth of this wire at 30.0°C?
i besiq
(a
cross-sectional area of this wire at 30.0°C?
what is the resistance of this wire at 30.0°C, considering the new resistivity
and the new physical dimensions of this resistor?
(8) Calculate the resistance of this wire at 30.0°C using the new resistivity and
the old dimensions of the wire. (This is the same as using the equation for
R from Problem 6.23.)
(h) Compare your answers to parts (f) and (g). Is it a valid approximation to
ignore the changes in the physical dimensions of the wire?
7.21 In the morning, when the temperature is 45.0°F, you fill up a steel tanker
truck (completely) with 1400.0 gal of gasoline. As you drive the gasoline to its
destination, the temperature increases to 75.0°F. How many gallons of gasoline
will overflow due to thermal expansion?
..
.. 7.22 After having your gasoline overflow in the previous problem, you decide
to shop smarter the following day. What is the maximum amount of gasoline you
can place in your tanker truck for it not to overflow, if the temperature rises from
45.0°F to 75.0°F as it did before?
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