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Georgia [21]
3 years ago
6

Physics in motion Unit 6A The nature of waves

Physics
1 answer:
Daniel [21]3 years ago
4 0

#1

length of one complete wave shape is known as wavelength

#2

Frequency is defined as number of oscillations per second or number of waves passing through a point in one second.

#3

One Time period is the time to cover one complete wavelength distance by the wave

#4

relation between time period and frequency is given as

f = \frac{1}{T}

#5

Time period of simple pendulum is given as

T = 2\pi \sqrt{\frac{L}{g}}

so it depends on length of pendulum and acceleration due to gravity

#6

amplitude of the wave is the height above the axis to which particle can attain its maximum position or its maximum height on y axis is amplitude

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Blood in a carotid artery carrying blood to the head is moving at 0.15 m/s when it reaches a section where plaque has narrowed t
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Answer:

26.9 Pa

Explanation:

We can answer this question by using the continuity equation, which states that the volume flow rate of a fluid in a pipe must be constant; mathematically:

A_1 v_1 = A_2 v_2 (1)

where

A_1 is the cross-sectional area of the 1st section of the pipe

A_2 is the cross-sectional area of the 2nd section of the pipe

v_1 is the velocity of the 1st section of the pipe

v_2 is the velocity of the 2nd section of the pipe

In this problem we have:

v_1=0.15 m/s is the velocity of blood in the 1st section

The diameter of the 2nd section is 74% of that of the 1st section, so

d_2=0.74d_1

The cross-sectional area is proportional to the square of the diameter, so:

A_2=(0.74)^2 A_1=0.548 A_1

And solving eq.(1) for v2, we find the final velocity:

v_2=\frac{A_1 v_1}{A_2}=\frac{A_1 (0.15)}{0.548 A_1}=0.274 m/s

Now we can use Bernoulli's equation to find the pressure drop:

p_1 + \frac{1}{2}\rho v_1^2 = p_2 + \frac{1}{2}\rho v_2^2

where

\rho=1025 kg/m^3 is the blood density

p_1,p_2 are the initial and final pressure

So the pressure drop is:

p_1 - p_2 = \frac{1}{2}\rho (v_2^2-v_1^2)=\frac{1}{2}(1025)(0.274^2-0.15^2)=26.9 Pa

8 0
3 years ago
Im back and need help
const2013 [10]

Always here to help. Bring it!!!

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3 years ago
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