How did ancient peoples of central Africa predict the weather?
What will be an ideal response?
They observed the orientation of the crescent moon relative to the horizon. The orientation of the "horns" is related to rainfall patterns.
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The thermionic emission current density from a hot filament is in the form of a rate equation, with the energy term equal to the _________.
Fill in the blank(s) with the appropriate word(s).
If an iron-0.77 % C steel is very rapidly cooled from 800°C to room temperature, the expected microstructure is described as _____________.
Fill in the blank(s) with the appropriate word(s).
A hollow steel ball of diameter 3.0 m barely floats in water. What is the thickness of the wall of the ball? The density of iron is 7.87 g/cm3 and that of water is 1000 kg/cc
A) 6.6 cm B) 37 cm C) 131 cm D) 79 cm
The slope of the acceleration-time curve represents:
a. the velocity. b. the rate of change of acceleration. c. the rate of change of displacement. d. the area under the position vs. time curve.