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4 years ago

7

In winter time when the drapes are opened for energy efficiency, the most important type of radiation that is allowed is

1 answer:

lozanna [386]4 years ago

4 0

Answer:

Option B

IR radiation

Explanation:

Infrared radiation is preferred since they have longer wavelengths compared to those of visible lights although shorter than those of radio waves hence for energy efficiency, IR radiation should be allowed during winter seasons when drapes are open for energy efficiency.

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A large plate is fabricated from a steel alloy that has a plane strain fracture toughness of 78 MPa (70.98 ksi). If the plate is

Reika [66]

Answer:

minimum length of a surface crack is 15.043 mm

Explanation:

given data

strain fracture toughness K = 78 MPa

tensile stress = 345 MPa

Y = 1.04

to find out

minimum length of a surface crack

solution

we find here length of critical interior flaw from formula that is

α = $\frac{1}{\pi} (\frac{K}{\sigma Y})^2$ ....................1

put here value we get

α = $\frac{1}{\pi} (\frac{78*\sqrt{10^3} }{345*1.04})^2$

α = 15.043 mm

so minimum length of a surface crack is 15.043 mm

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lana66690 [7]

Answer:

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ICE Princess25 [194]

Answer:

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Mass and chemical composition

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