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3 years ago

I don't understand why when you use a straw the higher pressure outside of it pushes the water up the straw.

2 answers:

6 0

Pressure is force acting on an area .
in the same area, more pressure means more force.

2 person, pressure outside and one in straw push water against each other. more pressure outside, so more force it pushes ... where will the water flow?

ValentinkaMS [17]3 years ago

3 0

When material stuff is free to move, it moves away from stronger force on it to weaker force on it. OK ? Now take it to the next step: When material stuff is free to flow ... like liquid or gas ... it flows from higher pressure to lower pressure. That's what makes wind, and that's why water comes out of a garden hose when you open the nozzle. It doesn't amaze you at all when you INCREASE the pressure at one end of the straw (blow into it), and air moves DOWN and out of it. So it shouldn't bother you that when you DECREASE the pressure at your end, anything that's free to flow UP the straw will do that.

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ZanzabumX [31]

Answer

given,

Hunk Finn speed,v_y= 0.7 m/s

Speed of river,v_x = 1.50 m/s

Assuming the speed of the river is in x-direction.

Speed of Hunk Finn to be in y-direction.

Hunk velocity relative to river =

$x = \sqrt{v_y^2+v_x^2}$

$x = \sqrt{2.74}$

$x =1.66\ m/s$

Speed of Hunk relative to river = 1.66 m/s

direction of the boat

$\theta =tan^{-1}(\dfrac{v_y}{v_x})$

$\theta =tan^{-1}(\dfrac{0.7}{1.50})$

$\theta = 25.01^{\circ}$

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4 years ago

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SVEN [57.7K]

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3 years ago

Johanna makes the table below to organize her notes about centripetal forces.

umka21 [38]

Gravity

Explanation:

Johanna's table:

Circular motion Centripetal force

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The force of gravity is constantly pulling and attractive all objects and bodies to its center.

This force is directed towards the center of the orbit of the earth and it is a centripetal force

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3 years ago

Read 2 more answers

what would someones mass be if their weight was 158.4? This is for science homework, they gave me a random weight # but no mass.

bekas [8.4K]

ON EARTH, every kilogram of mass weighs about 2.205 pounds.

So if you know the weight (in pounds), and you know that it was
weighed on Earth, you can simply divide the pounds by 2.205 ,
and you'll get the mass (in kilograms).

I can see that on this science homework, they used 2.2 for the weight
of 1 kilogram expressed in pounds. So just divide the weight by 2.2
to get the mass in kilograms.

(The weight number they gave you is not so random. :-) )

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3 years ago

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PtichkaEL [24]

Explanation:

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3 years ago