In tempered glass, the stress in outer surface is in a state of _________.
Fill in the blank(s) with the appropriate word(s).
compression
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A cross-flow heat exchanger is used to heat mixed air from 20 ºC to 45ºC. Water at 75ºC enters the tube and leaves at 45ºC. If the overall heat transfer coefficient is 50 W/m^2?ºC and there is to be 30,000 W of heat exchanged, determine the necessary heat exchanger surface area and the mass flow of water.
What will be an ideal response?
The flatness problem is the fact that the observed density of matter is unexpectedly different from the critical density predicted by the inflationary epoch
Indicate whether the statement is true or false
Most of the modern large optical telescopes are refractors.
Answer the following statement true (T) or false (F)
What do we mean by dimension in the context of relativity?
A) the size of an object B) the number of independent directions in which movement is possible C) the letter used to represent length mathematically D) the number of sides that we can see when we look at an object E) the height of an object