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Archy [21]
3 years ago
10

Plz help me asap !!!!!!!!!!

Physics
1 answer:
nlexa [21]3 years ago
6 0

Answer:

B- 65km

C- 2.8km/h

D- average speed

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a ultrasonic wave at 8x10^4 Hz is emitted into a vien where the speed of sound in blood is 1570 m/s. the wave reflects off the r
Aneli [31]

Answer: 0.392 m/s

Explanation:

The Doppler shift equation is:

f'=\frac{V+V_{o}}{V-V_{s}} f

Where:

f=8(10)^{4} Hz is the actual frequency of the sound wave

f'=8.002(10)^{4} Hz is the "observed" frequency

V=1570 m/s is the speed of sound

V_{o}=0 m/s is the velocity of the observer, which is stationary

V_{s} is the velocity of the source, which are the red blood cells

Isolating V_{s}:

V_{s}=\frac{V(f'-f)}{f'}

V_{s}=\frac{1570 m/s(8.002(10)^{4} Hz-8(10)^{4} Hz)}{8.002(10)^{4} Hz}

Finally:

V_{s}=0.392 m/s

3 0
2 years ago
How does energy travel in a mechanical wave?
3241004551 [841]

Answer:

In a medium

Explanation:

8 0
3 years ago
Two horses are pulling a box in two different directions as shown in the below image. The image shows one 30.0 N force due north
Novay_Z [31]

Explanation:

'What is the magnitude of the force needed to stop the horses and bring the box into equilibrium?' ≈42N; according to the vectors rules.

'Where would you locate the rope to apply the force?' - in point D.

PS. zoom out the attached picture.

4 0
3 years ago
An oscillator consisting of a material point of m = 200g vibrates under the action of an elastic force according to the equation
Debora [2.8K]

Answer:

an oscillator consisting of a material point of m = 200g vibrates under the action of an elastic force according to the equation y = 0.2sin (π / 4 • t + π / 16) (m)

calculate the period and frequency of the oscillation

calculate the speed and acceleration

calculate the Total Energy

8 0
2 years ago
Which of the following quantities can be determined from a speed-time graph of a particle travelling in a straight line?
enot [183]

The answer is:

Both the distance traveled in a given time and the magnitude of the acceleration at a given instant


Hope I Helped!

8 0
3 years ago
Read 2 more answers
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