A cylindrical wire of radius 2.0 mm carries a current of 2.5 A. The potential difference between points on the wire that are 46 m apart is 3.7 V
(a) What is the electric field in the wire? (b) What is the resistivity of the material of which the wire is made?
a) 0.080 V/m
b) 4.0 × 10-7 ? ? m
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Calculate the peak heat flux for nucleate pool boiling of water at 300 kPa pressure and 110°C on clean copper.
GIVEN
? Nucleate pool boiling of water on clean copper
? Pressure = 3 atm
? Water temperature (Tw) = 390°C
Find
? The peak heat flux (q"max)
ASSUMPTIONS
? Steady state
PROPERTIES AND CONSTANTS
From Table 9.2, the surface tension at 133°C (o) = 0.0522 N/m
The most cost effective way to reduce heat loss from a window is ________
a. add a storm window b. install a triple pane window c. weatherstrip around the outside perimeter of the window d. install a thermal drape
Cepheid and RR Lyrae variable stars change their brightness by ____
a. atmospheric explosions of hydrogen gas b. internal changes in their fusion processes c. a combination of atmospheric explosions and internal changes d. a combination of atmospheric explosions and physically pulsating e. changing its period between pulses
Why weren't many elements heavier than helium produced during the nucleosynthesis era?
What will be an ideal response?