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Aleksandr-060686 [28]
3 years ago
11

PLZZZ HELPPP, WILL GIVE BRAINLYIEST

Physics
2 answers:
Georgia [21]3 years ago
7 0
I believe it's TRUE
inysia [295]3 years ago
4 0
Yes. I also believe it's True!
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The radius of the aorta is «10 mm and the blood flowing through it has a speed of about 300 mm/s. A capillary has a radius of ab
stealth61 [152]

Answer:

(I). The effective cross sectional area of the capillaries is 0.188 m².

(II). The approximate number of capillaries is 3.74\times10^{9}

Explanation:

Given that,

Radius of aorta = 10 mm

Speed = 300 mm/s

Radius of capillary r=4\times10^{-3}\ mm

Speed of blood v=5\times10^{-4}\ m/s

(I). We need to calculate the effective cross sectional area of the capillaries

Using continuity equation

A_{1}v_{1}=A_{2}v_{2}

Where. v₁ = speed of blood in capillarity

A₂ = area of cross section of aorta

v₂ =speed of blood in aorta

Put the value into the formula

A_{1}=A_{2}\times\dfrac{v_{2}}{v_{1}}

A_{1}=\pi\times(10\times10^{-3})^2\times\dfrac{300\times10^{-3}}{5\times10^{-4}}

A_{1}=0.188\ m^2

(II). We need to calculate the approximate number of capillaries

Using formula of area of cross section

A_{1}=N\pi r_{c}^2

N=\dfrac{A_{1}}{\pi\times r_{c}^2}

Put the value into the formula

N=\dfrac{0.188}{\pi\times(4\times10^{-6})^2}

N=3.74\times10^{9}

Hence, (I). The effective cross sectional area of the capillaries is 0.188 m².

(II). The approximate number of capillaries is 3.74\times10^{9}

3 0
3 years ago
Why do resistors have tolerance?
MariettaO [177]
Machines capable of manufacturing exactly the same component time after time,
with exactly the resistance you want, would be very expensive, and so would the
products they turn out.  A resistor would cost a dollar instead of a few pennies.
The machine itself, and its output, work within tolerances.

The cheapest mass-produced resistors are guaranteed to be within 20% above
or below the resistance marked on them.  And you know what ?  For most bench-
work and prototyping, that's usually close enough.
8 0
4 years ago
The velocity of a car changes from 5 m/s to 20 m/s in 30 sec the acceleration?​
stepan [7]

Answer:

0.5m/s2

..............

4 0
3 years ago
Read 2 more answers
What is potential energy??​
Murrr4er [49]

Answer:

the energy possessed by a body by virtue of its position relative to others, stresses within itself, electric charge, and other factors.

hope this helps

have a good day :)

Explanation:

3 0
3 years ago
Read 2 more answers
Not really understanding this, wouldn't mind some help. : )
ddd [48]

Explanation:

Given

Mass (m) = 1200 kg

Acceleration (a) = 3 m/s²

Force (F) = ?

We know

F = m * a

= 1200 * 3

= 3600 Newton.

Therefore the force acting on the car is 3600 Newton.

Hope it will help):)

5 0
3 years ago
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