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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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
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
Why weren't many elements heavier than helium produced during the nucleosynthesis era?
What will be an ideal response?
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