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3 years ago

7

Water flows through a 0.5 cm diameter pipe connected to a 1 cm diameter pipe. Compared to the speed of the water in the 0.5 cm p

ipe, the speed in the 1 cm pipe is

1 answer:

elena55 [62]3 years ago

3 0

A

Answer:

Speed of water in the 0.5cm diameter will be faster because it has a smaller area

Since area x radius ² so if radius is reduced by 0.5 speed is increased by 4times in the 0.5 diameter pipe

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A student is hammering a nail into a board. Where should he hold the hammer and why?

MaRussiya [10]

Answer:

At the end of the handle farthest from the head of the hammer.

Explanation:

The force of the hammer is greatest the longer the radius is on a which would be the length of the handle. Simple mechanical advantage.

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Two small plastic spheres each have a mass of 2 grams and a charge of -50 nC. They are placed 2 cm apart (center to center). A)

Stells [14]

Answer:

Part a)

F = 0.056 N

Part b)

a = 28.13 m/s/s

Explanation:

Part a)

Electrostatic force between two charged balls is given as

$F = \frac{kq_1q_2}{r^2}$

now we will have

$q_1 = q_2 = 50 nC$

r = 2 cm

now we will have

$F = \frac{(9\times 10^9)(50 \times 10^{-9})(50 \times 10^{-9})}{0.02^2}$

so here we have

$F = 0.056 N$

Part b)

Now due to above force the acceleration of one ball which is released is given as

$a = \frac{F}{m}$

$a = \frac{0.056}{2 \times 10^{-3}}$

$a = 28.13 m/s^2$

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4 years ago

Which of the following describes an electric motor?

USPshnik [31]

Answer:

a is correct answer because the electricity consumed by it rotates the part of motor

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4 years ago

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A flutist assembles her flute in a room where the speed of sound is 340 m/s. When she plays the note A, it is in perfect tune wi

Yuki888 [10]

Incomplete question as we have not told to find which quantity.The complete question is here

A flutist assembles her flute in a room where the speed of sound is 340 m/s. When she plays the note A, it is in perfect tune with a 440 Hz tuning fork. After a few minutes, the air inside her flute has warmed to where the speed of sound is 347 m/s .

(a)How many beats per second will she hear if she now plays the note A as the tuning fork is sounded?

(b) How far does she need to extend the "tuning joint" of her flute to be in tune with the tuning fork?

Answer:

(a) $f_{beat}=9.06Hz$

(b) The flutist extends to the turning joint of her flute by 1.363×10⁻⁵m

Explanation:

Part A

The wavelength of sound wave of the note A

λ=v/f

Where v speed of sound

f is frequency

Substitute the given values

So

λ=(340m/s)÷440Hz

λ=0.7727 m

The new frequency of note A when the air inside the flute has warmed

f¹=v¹/λ

f¹=(347m/s)/0.7727 m

f¹=449.05Hz

The Beat frequency of two waves is:

$f_{beat}=|f_{1}-f_{2} |\\f_{beat}=|449.05Hz-440Hz | \\f_{beat}=9.06Hz$

Part B

Frequencies of standing waves modes of an open tube of Length L:

$f_{m}=m(v/2L)\\where\\m=1,2,3,4........$

So

$L=m(v/2f_{m} )$

L=mλ/2

From part (a) The wavelength of sound of note A is 0.7727m and m=1

So

$L=(0.7727/2)=0.38635m$

When the air inside the flute has warmed.Then the new length is given below at same frequency of 440 Hz

So

$L_{a}=v/2f\\L_{a}=340m/s/2*440Hz\\L_{a}=0.38636m$

So the length the flutist extends to the turning joint for the flute to be:

ΔL=La-L

ΔL=0.38636m - 0.38635

ΔL=1.363×10⁻⁵m

The flutist extends to the turning joint of her flute by 1.363×10⁻⁵m

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3 years ago

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Calculate the centripetal force on a 4.5 kg sensor that is attached at the end of a 90.0-m long wind turbine blade that is rotat

ad-work [718]

15972.55N

Explanation:

Given parameters:

Mass of sensor = 4.5kg

length of the turbine blade = 90m

angular velocity = 1 rev/s

Unknown:

Centripetal force = ?

Solution;

Centripetal force is the force that acts on a body moving in a radial form directed towards the center.

It is mathematically expressed as:

F = $\frac{mv^{2} }{r}$

m is the mass

r is the radius of path

v is the velocity

v = wr

w is the angular velocity

v = 1 x 2πrad x 90 = 565.2m/s

F = $\frac{4.5 x 565.2^{2} }{90}$ =15972.55N

learn more:

Force brainly.com/question/8590524

#learnwithBrainly

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3 years ago