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dusya [7]
3 years ago
7

Water does not run out of dropper unless the rubber-bulb is pressed. Why?

Physics
1 answer:
nekit [7.7K]3 years ago
8 0

Answer:

The pressure inside the dropper is same as the atmospheric pressure when the rubber bulb is not pressed. ... But when we press the rubber bulb the pressure inside the dropper increases and hence the water flows out.  Atmospheric pressure acting from outside the dropper balances the pressure exerted by water and water does not come out of a dropper. On pressing the dropper inside pressure of water becomes more than outside atmospheric pressure and water run out. When we press the bulb of a dropper with its nozzle kept in water, air in the dropper is seen to escape in the form of bubbles. Once we release the pressure on the bulb, water gets filled in the dropper.

                                             <u><em>Thank You</em></u>

                                        <u> </u>Please mark me brainliest

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Which of the following diseases has been all but eliminated from the United States because of wastewater treatment plants?
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A meterstick is initially standing vertically on the floor. If the meterstick falls over, with what angular velocity will it hit
notsponge [240]

L = length of the meter stick = 1 m

h = height of center of mass of stick from bottom end on the floor = L/2 = 1/2 = 0.5 m

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moment of inertia of the meter stick about the bottom end is given as

I = m L²/3

using conservation of energy

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(0.5) I w² = m g h

(0.5) (m L²/3) w² = m g h

( L²) w² =  6g h

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w = 5.4 rad/s

8 0
3 years ago
A series circuit contains a 100.0-Ω resistor, a 0.450-H inductor, a 0.360-µF capacitor, and a time-varying source of emf providi
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Answer:

A) The resonance angular frequency in an L-R-C circuit is

\omega_0 = \frac{1}{\sqrt{LC}} = \frac{1}{\sqrt{0.45\times0.36\times 10^{-6}}}\\\omega_0 = 2.48\times10^3 rad/s

B) The current can be found by calculating the impedance of the system.

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Travka [436]

c. Wind power can turn turbines to generate electrical power.

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The correct statement of all is that wind power can turn turbines to generate electrical power.

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