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Index (Y)

YA - YC

YD - YF

YG - YJ

YK - YN

YO - YR

YS - YV

YW - YZ

Moment of truth
The fastest man-made object that ever leave the Earth is the Pinoeer 10 spacecraft, launched in 1972, and attained a speed of more than 32000 mph.


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Young's modulus Eng.
A measure of mechanical strength or elasticity of a material with a usual symbol of E and defined as a ratio of stress/strain. The stress can be either tensile or compressive depends on the material being stretched or compressed. It is also known as the elastic modulus. The unit is in Pascal, Pa (or Nm-2). For example, for soda-lime glass, E = 69 GPa and for iron, E = 196 GPa.

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