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The short B-N (1.57 Å) bond is close to the diamond C-C bond length (1.54 Å), that results in strong covalent bonding between atoms in the same fashion as in diamond. The slight decrease in covalency for B-N bonds compared to C-C bonds reduces the hardness from ~100 GPa for diamond down to 48 GPa in c-BN.
Some high schools, to reflect the varying skill required for different course levels, will give higher numerical grades for difficult courses, often referred to as a weighted GPA. For example, two common conversion systems used in honors and Advanced Placement courses are: A = 5 or 4.5; B = 4 or 3.5 [5] C = 3 or 2.5; D = 2 or 1.5; F = 0 [19]
1 GPa Extremely high-pressure chemical reactors (10 kbar) [citation needed] 1.5 GPa Diamond melts using a 3 kJ laser without turning into graphite first [79] 1.5 GPa 220,000 psi tensile strength of Inconel 625 according to Aircraft metal strength tables and the Mil-Hdbk-5 [80] 5.8 GPa 840,000 psi Ultimate tensile strength of the polymer Zylon ...
"GPA is unique to each school district, county, state, etc. Within a county, even, GPAs differ between public and private schools. What Students Should Know About the GPA Scale
GPA is calculated by using the number of grade points a student earns in a given period of time. A GPA is often calculated for high school , undergraduate , and graduate students. A cumulative grade point average ( CGPA ), is the average of all the GPAs a student has achieved during their time at the institution. [ 3 ]
The precise tensile strength of diamond is unknown, though strength up to 60 GPa has been observed, and theoretically it could be as high as 90–225 GPa depending on the sample volume/size, the perfection of diamond lattice and on its orientation: Tensile strength is the highest for the [100] crystal direction (normal to the cubic face ...
Here is Wimsatt's nomination from the school: “James is a senior at Orange High School with an impressive GPA over a 4.0. He has made significant contributions to our school community, including ...
Although graphene sheets have 2D symmetry, carbon nanotubes by geometry have different properties in axial and radial directions. It has been shown that CNTs are very strong in the axial direction. [1] Young's modulus on the order of 270–950 GPa and tensile strength of 11–63 GPa were obtained. [1]