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Anuta_ua [19.1K]

2 years ago

10

why can planes fly but boats cant and why can boats float but not planes and saying planes fly because of the wind or air is not

correct .

2 answers:

Aleksandr-060686 [28]2 years ago

4 0

Answer:

Planes can fly because they have wings and jet turbines and boats cant they need wings and planes cant float because there is to much weight

Tanya [424]2 years ago

4 0

Planes can fly because of their wings but they are too much weight to float :)

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A specimen of commercially pure copper has a strength of 240 MPa. Estimate its average grain diameter using the Hall-Petch equat

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Answer:

3.115× $10^{-3}$ meter

Explanation:

hall-petch constant for copper is given by

$S_0$ =25 MPa

k=0.12 for copper

now according to hall-petch equation

$S_Y$ = $S_0$ + $\frac{K}{\sqrt{D}}$

240=25+ $\frac{0.12}{\sqrt{D}}$

D=3.115× $10^{-3}$ meter

so the grain diameter using the hall-petch equation=3.115× $10^{-3}$ meter

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3 years ago

If a lever operates at a mechanical disadvantage, it means that the ________.

alekssr [168]

Answer:

The correct answer is option 'B': Load is far from fulcrum and the effort is applied near the fulcrum

Explanation:

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Answer:

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Explanation:

find attached the figure

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2 years ago