Identical point charges (+50 ?C) are placed at the corners of a square with sides of 2.0-m length. How much external energy is required to bring a fifth identical charge from infinity to the geometric center of the square?
a. 41 J
b. 16 J
c. 64 J
d. 10 J
e. 80 J
c
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What will be an ideal response?
Saturated steam at 34 kPa condenses on a 1-m-tall vertical plate whose surface temperature is uniform at 60°C. Compare the average heat transfer coefficient and the value of the coefficient 1/3, 2/3, and 1 m from the top. Also, find the maximum plate height for which the condensate film will remain laminar.
GIVEN
? Saturated steam condensing on a vertical plate
? Steam pressure (p) = 34 kPa
? Plate height (L) = 1 m
? Plate surface temperature (Ts) = 60°C (uniform)
FIND
(a) The average heat transfer coefficient (hc)
(b) The local heat transfer coefficient (h?) at x = 1/3 L, 2/3 L, and L
(c) The maximum height for which the condensate film will remain laminar
ASSUMPTIONS
? Steady state
? Film condensation occurs
SKETCH
PROPERTIES AND CONSTANTS
From Appendix 2, Table 13, for saturated water at 34 kPa
Which of the following has the shortest wavelength?
a) Visible light b) Gamma Ray c) Ultraviolet d) Radiowaves
Scientific Notation: Which of the following numbers is the smallest?
A. 15 × 10-3 B. 0.15 × 100 C. 0.00015 × 103 D. 0.00000015 × 106