Physics, 03.07.2019 21:00 muhammadcorley123456

Water flowing through a garden hose of diameter 2.74cm fills a25.0l bucket in 1.50 min a) what is the speed of the water leaving the end of the hose? b)a nozzle is now attached to the end of the hose. if the nozzle diameter is one third the diameter of the hose, what is the speed of the water leaving the nozzle?

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Answer from: jennkoga

(a) The speed of water leaving the hose is 0.471 m/s

(b) The speed of water leaving the nozzle is 4.24 m/s.

(a) Let the area of the hose be a₁ and the speed water leaving the hose be v₁. In 1 second, the volume of water flowing per second $\frac{V}{t}$ is given by,

$\frac{V}{t} =a_1v_1$ ......(1)

The volume of the bucket is V=25.0 *10^-^3m^3

The radius of the hose is $r_1=\frac{2.74*10^-^2 m}{2} =1.37*10^-^2 m$

From equation (1),

$v_1=\frac{V}{A_1t} =\frac{V}{\pi r_1^2t}$

Substitute the given values in the equation.

$v_1 =\frac{V}{\pi r_1^2t}\\ =\frac{25.0*10^-^3m^3}{(1.50*60s)(3.14)(1.37*10^-^2)^2} \\ =0.471 m/s$

(b) A nozzle is now attached to the hose. The volume of liquid which flows out per second through the hose and the nozzle remains the same. If the area of the nozzle is a₂ and the speed at which the water exits the nozzle is v₂, then,

$a_1v_1=a_2v_2\\ v_2=\frac{a_1}{a_2} v_1$

If the diameter of the nozzle is one third of the diameter of the hose, then,since area is directly proportional to the square of the diameter,

$\frac{a_1}{a_2} =9$

Therefore,

$v_2=\frac{a_1}{a_2} v_1\\ =9*0.471m/s\\ =4.24m/s$

Thus, the speed of water leaving the hose is 0.471 m/s and the speed of water leaving the nozzle is 4.24 m/s.

Answer from: Quest

electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia

Answer from: Quest

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Water flowing through a garden hose of diameter 2.74cm fills a25.0l bucket in 1.50 min a) what is th...

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