Nikša preguntado en Science & MathematicsPhysics · hace 1 mes

# Equivalence principle question?

According to equivalence principle when we put the finger on the hose lesser volume shoots out at higher speed, the flow remains the same. So what does happen with house tap, the flow does not stay the same when it's barely open and wide open.

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Andrew Smith Yes, rheostat parallel is good but before answering physics questions, you might first learn about inertial propulsion LAW i told you about some time ago, any assymetrical rotation of unbalanced mass converts centrifugal force into linear acceleration.

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• Dixon
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hace 1 mes
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The flow doesn't remain the same even on the hose and finger. The jet of water might be faster but the flow rate is still less due to the obstructing finger.

• hace 1 mes

You are misinterpreting. This is only the case if the volume flow rate becomes unchanged.  However if you use an electrical analogy with an energy source ( dam, tank or pump) a high resistance pipe, and a low resistance nozzle then SMALL changes at the nozzle make negligible changes to flow rate.

LARGE increases in the friction at the nozzle make the total resistance to flow higher eventually leading to the flow stopping when the tap is completely off.

• hace 1 mes

It is not the ‘equivalence principle’.  The equivalence principle is Einstein’s idea that the effects of acceleration are same as those of a gravitational field.  So acceleration and gravity are equivalent.

Think of a bucket with 2 holes in the bottom.  One hole has twice the area of the other.  Which one has the higher flow rate?

In addition the shape of the spout is importnant.  A badly designed tap would indeed squirt a narrow jet of water very fast when nearly closed.   But inside the tap, after the water leaves the valve, the water is multiply ‘reflected’ from the inner walls of the spout and redistributes; the water then leaves the (wide) exit of the spout at a lower speed.

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