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Lerok [7]
2 years ago
7

Water flowing through a garden hose of diameter 2.74cm fills a 25-L bucket in 1.50 min. (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?
Physics
1 answer:
KiRa [710]2 years ago
7 0

The Speed of the water leaving the end of the nozzle = 4.25 m/s.

<h3>What is the speed of the water leaving the nozzle?</h3>

Discharge, Q = Av,

where A is the area discharging section and v is the velocity of flow.

Volume of bucket = 25.0 L

Time taken = 1.50 min

Discharge = Volume / Time

= 25/1.5

= 16.67 L/min.

Diameter of hose = 2.74 cm = 0.0274 m

Q = Av

$2.78 * 10^{-4} = (\pi * 0.0274 ^2/4) * v

v = 0.47 m/s

Speed of the water leaving the end of the hose = 0.47 m/s.

b) Diameter of nozzle = Diameter of hose/3

= 0.0274/3

Diameter of nozzle  = 0.00913 m

Q = Av

$$2.78 * 10^{-4} = (\pi * 0.00913 ^2/4) * v

v = 4.25 m/s

Speed of the water leaving the end of the nozzle = 4.25 m/s

To learn more about Speed refer to:

brainly.com/question/4931057

#SPJ4

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An electromagnetic wave is transporting energy in the negative y direction. At one point and one instant the magnetic field is i
natali 33 [55]

Answer:. Option c

Explanation: the speed of an electromagnetic wave is simply the vector product of the magnetic field and the electric field.

The direction of the velocity is the direction of the electromagnetic wave.

The wave is already moving towards the negative y axis (-j) and the magnetic field is already pointing towards the positive x axis (i)

From cross product of unit vectors

i × j = k

i × k = - j

With the second identity, we can see that the electric field will be pointing towards the positive of the x axis (k).

Option c is validated

4 0
3 years ago
Which symbol represents a type of electromagnetic radiation released during radioactive decay?
Lena [83]
The correct option is (D) Gamma ( _0^0\gamma )

Explanation:
Now this question is a tricky one because all of these options are somehow involved in radioactive decay; however, in this case the SYMBOL is required NOT the elements. There are three symbols involved in radioactive decay, which are:
1. α for alpha decay
2. β for beta decay
3. γ for gamma decay 

In the options only one symbol is present which is gamma. Hence option (D) Gamma ( _0^0\gamma ) is the correct answer.

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4 0
4 years ago
The quantity of charge q (in coulombs) that has passed through a surface of area 2.00 cm2 varies with time
Makovka662 [10]

Explanation:

We have,

Surface area, A=2\ cm^2=0.0002\ m^2

The current varies wrt time t as :

q(t) = 4t^3 + 5t + 6

(a) At t = 2 seconds, electrical charge is given by :

q(t) = 4t^3 + 5t + 6\\\\q(2) = 4(2)^3 + 5(2) + 6\\\\q=48\ C

(b) Current is given by :

I=\dfrac{dq}{dt}\\\\I=\dfrac{d(4t^3 + 5t + 6)}{dt}\\\\I=12t^2+5

Instantaneous current at t = 1 s is,

I=12(1)^2+5=17\ A

(c) Current is, I=12t^2+5

Current density is given by electric current per unit area.

J=\dfrac{I}{A}\\\\J=\dfrac{(12t^2+5)}{0.0002}\\\\J=5000(12t^2+5)\ A/m^2

Therefore, it is the required explanation.

7 0
4 years ago
What is the area of space around a magnet called?
erma4kov [3.2K]

Answer:

These acts of attraction and repulsion are called “magnetism”, and the magnetic space around a magnet is called the “magnetic field”

Explanation:

8 0
3 years ago
I would really appreciate the help on this pass paper question.
zvonat [6]

Answer:

Heat lost thru doors & windows = (100 - 75 - 5) = 20

20% is the fraction of heat lost thru doors and windows

One wants to obtain the largest savings per unit of cost

roof:

200 / 600 = 1/3

150 / 1000 = .15

40 / 2300 = .017

The largest of these is 1/3 so the most benefit would be obtained by insulating the roof

Since heat loss thru the roof depends on heat loss thru the attic, this is the most cost effective in reducing heat loss

The more the difference in temperature between the ceiling and roof (attic) the more heat will be lost thru the roof, so insulating the roof will decrease the heat loss of the attic

8 0
2 years ago
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