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loris [4]
3 years ago
12

The aorta is the main artery from the heart. a typical aorta has an inside diameter of 1.8 cm and carries blood at speeds of up

to 35. cm/s. What is the speed of the blood if plaque on the artery's walls has reduced its diameter by 50%?
Physics
1 answer:
defon3 years ago
3 0

Answer:

Explanation:

Volume per unit time flowing   will be conserved

a₁v₁  = a₂ v₂

π r₁² x v₁ = π r₂² x v₂

(0.9 x 10⁻²)² x .35 = ( .45 x 10⁻² )² x v₂

v₂ = 1.4 m / s

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Answer:

10m/s^2

Explanation:

Force = mass x acceleration

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= 20000000/2000000

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Answer:

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‏Explain how an electron emitted by the photoelectric effect can have kinetic energy less than threshold energy ?
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Answer:

the photons (quanta of light) collide with the electrons, these electrons have to overcome the threshold energy that is the energy of union with the metal, and the energy that remains is converted to kinetic energy.

          K = E - Ф

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The photoelectric effect is the emission of electrons from the surface of a metal.

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          E = hf

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          K = E - Ф

The energy of the photons is given by the Planck relation E = hf and according to Einstein the number of joints must be added

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4 0
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Answer:

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