Using graphical techniques estimate the temperature distribution through the earth around the electrical power line shown in Figure 2-62. Then estimate the heat transfer per unit length between the line and the ground surface.
The temperature distribution and the heat transfer can be approximated with a sketch
of the heat flow lines and isotherms. These two sets of lines need to be orthogonal or perpendicular at all times
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A series of tests in which water was heated while flowing through a 1 m-long electrically heated tube of 1.3 cm ID yielded the experimental pressure-drop data shown next.
GIVEN
Water flowing through a tube
Isothermal and nonisothermal pressure drop data given above
The dimensionless friction factor
Reynolds number
Inside tube diameter
Tube length
FIND
Dimensionless equation of the form:
SKETCH
PROPERTIES AND CONSTANTS
From Appendix 2, Table 13, for water
The Viking spacecraft searched for life on Mars by looking for the effects of life on the upper atmosphere
a. True b. False Indicate whether the statement is true or false
An east-facing loop carries a counterclockwise current as viewed from the east. Suppose we place this loop in a uniform magnetic field pointing vertically upward. The loop is free to rotate around any axis. How will the loop respond to the magnetic field?
A. When viewed from above, the loop will twist 90° clockwise to face south. B. When viewed from above, the loop will twist 90° counterclockwise to face north. C. When viewed from the south, the loop will twist 90° clockwise to face downward. D. When viewed from the south, the loop will twist 90° counterclockwise to face upward. E. The loop is not affected by the field.
A car coasts down a road into a valley and then coasts back up the next hill some distance
Where has its change in velocity been greatest? At the point at which it stops while going uphill? At the bottom of the hill? As it rolls back through the bottom to the other side? Explain.