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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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

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