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Elan Coil [88]
3 years ago
15

Why does water stay in a straw if you put your finger over it?

Physics
1 answer:
aivan3 [116]3 years ago
3 0

What's going on is that the water in the straw is pushed into the straw by the air pressure outside of the straw. As long as the pressure outside is able to overcome the force of gravity, the liquid will stay in the straw.


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lutik1710 [3]

Answer:20cm

Explanation:

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It has been suggested that rotating cylinders several miles in length and several miles in diameter be placed in space and used
stepladder [879]

Answer:

the required revolution per hour is 28.6849

Explanation:

Given the data in the question;

we know that the expression for the linear acceleration in terms of angular velocity is;

a_{c} = rω²

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ω = √( a_{c} / r )

where r is the radius of the cylinder

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given that; the centripetal acceleration equal to the acceleration of gravity a a_{c}  = g = 9.8 m/s²

so, given that, diameter = 4.86 miles = 4.86 × 1609 = 7819.74 m

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so we substitute

ω = √( 9.8 m/s² / 3909.87 m )

ω = √0.002506477 s²  

ω = 0.0500647 ≈ 0.05 rad/s  

we know that; 1 rad/s = 9.5493 revolution per minute

ω = 0.05 × 9.5493 RPM

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ω = 0.478082 × 60

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7 0
3 years ago
Which group in the periodic table is known as salt farmers?
adell [148]
<span>Which group in the periodic table is known as salt formers?

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</span><span>
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5 0
3 years ago
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Vsevolod [243]

Concept:

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3 years ago
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sergejj [24]
It will take about 3-5 hour
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