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Free_Kalibri [48]
3 years ago
8

What is the Doppler effect? (2 points) Select one: a. The apparent change in frequency of waves due to the motion of a source b.

The change in wave speed when it changes mediums c. The electricity created by light waves d. The change in wavelength when visible light strikes a prism
Physics
2 answers:
4vir4ik [10]3 years ago
5 0

Answer: option A is the correct answer

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iogann1982 [59]3 years ago
4 0

Answer:

Option A

The apparent change in frequency of waves due to the motion of a source

Explanation:

Doppler effect is the apparent change in frequency of waves due to the motion of a source. Doppler effect occurs when the source of waves moves towards the observer which causes emission of successive wave crests to be closer to the observer compared to the previous wave crest. This phenomenon was named after Austrian Physicist called Christian Doppler

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A diver can change his rotational inertia by drawing his arms andlegs close to his body in the tuck position. After he leaves th
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Answer:

3.14946 rad/s

Explanation:

I_i = Intial moment of inertia

I_f = Final moment of inertia

\omega_i = Initial angular velocity

\omega_f = Final angular velocity = \dfrac{2}{1.33}\times 2\pi\ rad/s

\dfrac{I_f}{I_i}=\dfrac{1}{3}

In this system the angular momentum is conserved

L_i=L_f\\\Rightarrow I_i\omega_i=I_f\omega_f\\\Rightarrow \omega_i=\dfrac{I_f\omega_f}{I_i}\\\Rightarrow \omega_i=\dfrac{1\times \dfrac{2}{1.33}\times 2\pi}{3}\\\Rightarrow \omega_i=3.14946\ rad/s

The angular velocity when the diver left the board is 3.14946 rad/s

3 0
3 years ago
Ryan is driving his car to band practice. His speed is 55 mph. Splat! A bug smashes against the windshield, and bug "guts" are e
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Answer:

The answer is C.

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Every point mass attracts every single other point mass by a force acting along the line intersecting both points. The force is proportional to the product of the two masses and inversely proportional to the square of the distance between them. In magnitude, the force they apply each other is the same. Therefore, the force that the windshield exerts on the bug and the force that the bug exerts on the windshield are the same magnitude.

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Why were phonograph records placed on the sides of the two voyager spacecraft launched in the 1970s?
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Answer:

The reason for phonograph installation is to provide information about humans to interstellar aliens.

Explanation:

Phonographs are archaic forms of gramophone which are able to record and reproduce sound.Phonographs were used in early days in voyagers to help transmit information about humans to nearby alien species in space.

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