Can someone please help me

Physics

1 answer:

Delicious77 [7]2 years ago

6 0

Answer:

I am 98% sure that the answers are B and A

Explanation:

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The buildup of plaque on the walls of an artery may decrease its diameter from 1.1 cm to 0.90 cm. The speed of blood flow was 17

natka813 [3]

Answer

Initial radius of the artery is (1.1 cm) / 2 = 0.55 cm

final radius of the artery is (0.90 cm) / 2 = 0.45 cm

initial velocity of the blood is 17 cm/s

Using equation of continuity is

A₁v₁=A₂v₂

π r₁² x v₁ = π r₂² x v₂

r₁² x v₁ = r₂² x v₂

0.55² x 17 =0.45² x v₂

v₂=25.39 cm/s

Bernoulli's equation is

$P_1 - P_2 = \dfrac{1}{2}\rho (v_2^2-v_1^2)$

rho is the density of blood = 1060 kg/m^3

$P_1 - P_2 = \dfrac{1}{2}\times 1060 \times (0.254^2-0.17^2)$

$P_1 - P_2 =18.87\ Pa$

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3 years ago

If a model ship is scaled to the ratio of 1:1,200, what size is the real ship

Ipatiy [6.2K]

The answer I had got was C x

5 0

3 years ago

The New York Wheel is the world's largest Ferris wheel. It's 183 meters in diameter and rotates once every 37.3 min.

bagirrra123 [75]

The radius of the Ferris wheel is r = 83/2 = 91.5 m.

The angular velocity is
ω = (2π rad)/(37.3*60 s) = 2.8075 rad/s
The tangential velocity is
v = rω = 0.2569 m/s

The arc length traveled in 8.6 min (= 8.6*60 s = 516 s) is
s = (91.5 m)*(2.8075 rad/s)*(516 s) = 132.553 m
The central angle swept is
θ = 132.553/91.5 = 1.4487 rad

From the vector diagram, the change in velocity is (from the Law of Cosines)
Δv² = v²(1 - 2 cosФ)
where Ф = Π - 1.4487 = 1.6929 rad
Δv² = 0.2569²[1 - 2*(-0.1218)] = 0.0821
Δv = 0.2865 m/s

The acceleration is
a₁ = (0.2865 m/s)/(516 s) = 5.6 x 10⁻⁴ m/s²

The actual centripetal acceleration is directed toward the center of the wheel, and its value is
a = v²/r = 0.2569²/91.5 = 7.2 x 10⁻⁴ m/s²

Answer:
a = 7.2 x 10⁻⁴ m/s², the centripetal acceleration acting toward the center of the wheel.
The magnitude of a₁ is 5.6 x 10⁻⁴ m/s², but it is not directed toward the center of the wheel.