A 120-V rms voltage is applied across a 6.0-?F capacitor and a series combination of a 100-? resistor. If the frequency of the power source is 60 Hz, what is the rms value of the current in the circuit?
A) 0.26 A
B) 0.36 A
C) 0.46 A
D) 0.56 A
E) 0.76 A
A
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Calculate the Nusselt number and the convection heat transfer coefficient for water at a bulk temperature of 32°C flowing at a velocity of 1.5 m/s through a 2.54-cm-ID duct with a wall temperature of 43°C. Use the Gnielinski correlation and two other correlations given in te text and cmpare the results.
GIVEN
• Water flowing through a duct
• Bulk water temperature (Tb) = 32°C
• Water velocity (V) = 1.5 m/s
• Inside diameter of duct (D) = 2.54 cm = 0.0254 m
• Duct wall surface temperature (Ts) = 43°C
FIND Use three different methods to find (a) The Nusselt number (NuD)
(b) The convective heat transfer coefficient (hc)
ASSUMPTIONS
• Steady state
• Fully developed, incompressible flow
SKETCH
PROPERTIES AND CONSTANTS
for water at a reference temperature equal to the bulk temperature (Tref = 32°C)
Thermal conductivity (k) = 0.619 W/(m K)
Kinematic viscosity (?) = 0.773 × 10–6 m2/s
Prandtl number (Prb) = 5.16
Absolute viscosity (?b) = 763 × 10–6 (Ns)/m2
Prandtl number at surface temperatue(Prs) = 4.06 At the surface temperature of 43°C:
Absolute viscosity (?s) = 626.3 × 10–6 (Ns)/m2
An uncharged spherical conducting shell surrounds a charge ?q at the center of the shell. The charges on the inner and outer surfaces of the shell are respectively
a. ?q, ?q. b. ?q, +q. c. +q, ?q. d. +q, +q. e. +q, 0.
Nuclei of atoms that make up a newborn baby were manufactured in
A) the mother's womb. B) the food the mother eats before delivery. C) ancient stars. D) the Earth. E) none of the above
Even though your car weighs several thousand pounds, it can easily be raised above your head by a pneumatic lift at the service station by a small motor pumping fluid through a pipe. This an illustration of
A. Bernoulli's Law. B. Pascal's Principle. C. Archimedes' Principle. D. Newton's 3rd Law.