What is the Prandtl number?
What will be an ideal response?
The Prandtl number is an index of the ratio of the momentum or viscous
transfer in a fluid to the thermal energy or heat transfer. A high Prandtl number
indicates a high momentum or viscous energy transfer as compared to the
thermal energy transfer.
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Current estimates place the age of the universe at about
A) 10 billion years. B) 10 million years. C) 14 billion years. D) 4 billion years.
A single brick falls with acceleration g. The reason a double brick falls with the same acceleration is
A) that in free fall all accelerations are g. B) its ratio of force to mass is the same. C) an experimental fact tested many times. D) none of the above
When light is either reflected or refracted, the quantity that does not change in either process is its
A. direction of travel. B. dispersion. C. frequency. D. speed. E. wavelength.
The proper abbreviation for ‘kilohertz' is ‘kHz.'
Indicate whether the statement is true or false