A concrete tensile test specimen fractures at a tensile stress of 4 MPa. Estimate the length of internal cracks in this concrete specimen if this type of concrete has a KIc of 0.3 MPa?m1/2.
What will be an ideal response?
Physics & Space Science
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Early telescopic observers thought the lunar mare were seas of water; today we know they are not liquid water but molten basalt, long ago frozen out
Indicate whether the statement is true or false
Physics & Space Science
One practical application of matter waves is
A) the electron microscope. B) photovoltaic cells. C) lasers. D) television. E) X-rays.
Physics & Space Science
Determine the atomic mass of a hypothetical element that occurs on Earth as a mixture of 20.00% 32X (atomic mass of isotope = 32.00 u) and 80.00% 34X (atomic mass of isotope = 34.00 u)
Physics & Space Science
In state n = 1, the energy of the hydrogen atom is -13.58 eV. What is its energy in state n = 2?
A) -13.58 eV B) -6.79 eV C) -4.53 eV D) -3.40 eV E) -1.51 eV
Physics & Space Science