What happens to the size and mass of an object as it moves faster?
What will be an ideal response?
A faster object's mass increases and length increases.
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Inductors store energy by accumulating excess charge within their coils
A) True B) False
Which subatomic particle or particles have no charge?
A) electrons and neutrons B) all subatomic particles have no charge C) neutrons only D) neutrons and protons
Which best describes the relationship between two systems in thermal equilibrium?
a. No net energy is exchanged. c. Masses are equal. b. Volumes are equal. d. The velocity is zero.
Consider a vertical 20-cm-tall flat plate at 120°C suspended in a fluid at 100°C. If the fluid is being forced past the plate from above, estimate the fluid velocity for which natural convection becomes negligible (less than 10%) in: (a) mercury (b) air (c) water.
GIVEN
? A vertical flat plate suspended in a fluid
? Plate temperature (Ts) = 120°C
? Fluid temperature (T?) = 100°C
? Fluid is being forced past the plate from above
? Plate height (H) = 20 cm = 0.2 m
FIND
? The fluid velocity (U?) for which natural convection has a less than 10% effect in
(a) mercury (b) air (c) water
ASSUMPTIONS
? Steady state
SKETCH
PROPERTIES AND CONSTANTS
From Appendix 2, Tables 26, 28 and 13
