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Sedaia [141]
3 years ago
12

The Doppler effect suggests that sound waves are relative to the observer. You know if an object is coming or going from the sou

nd it makes. Light waves follow the Doppler effect also. However, instead of sound changing, you know if an object is coming or going _____.
a-from the brightness of the light
b- from the color of the light
c- from the twinkle of the light
d- from the sound of the light
Physics
2 answers:
mrs_skeptik [129]3 years ago
5 0
A. Form the Brightness of the light
Serhud [2]3 years ago
3 0

a.....................

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Electron;Neutron is the correct answer.
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A child throws a ball vertically upward to a friend on a balcony 28 m above him. The friend misses the ball on its upward flight
photoshop1234 [79]

Answer:

t=1.9 sec

Explanation:

From the question we are told that:

Height h=28m

Time t=3s

Generally the Newton's equation for Initial velocity upward is mathematically given by

 s=ut+\frtac{1}{2}at^2

 28=3u-\frac{1}{2}*9.8*3^2

 u=24.03m/s

Generally the velocity at  elevation and depression occurs  as ball arrives and passes through S=28

 v=\sqrt{24.03-2*9.8*28}

 v=5.35m/s and -5.35m/s

Generally the Newton's equation for time to reach initial velocity  is mathematically given by

 v=u+at

 5.35=24.03-9.8t

 t=\frac{28.03-5.35}{9.8}

 t=1.9 sec

4 0
2 years ago
Calculate the kinetic energy of a dog,
Vanyuwa [196]

B: 20 j

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6 0
3 years ago
Examples of reaction force and action force hewlp​
mrs_skeptik [129]

Answer:

Action-Reaction Force Examples in Everyday Life

Recoil of a Gun.

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Diving off a Raft.

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hope this helps

6 0
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A fishing boat accidentally spills 3.0 barrels of diesel oil into the ocean. each barrel contains 42 gallons. if the oil film on
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Number of barrels are 3.0. Each barrel contains 42 gallons of oil. Thus, total volume of oil will be 42×3=126 gallons.

Converting gallons into m^{3}

1 gallon=0.00378 m^{3}

Thus, 126 gallons=0.4769 m^{3}

Thickness of oil film is 2.5\times 10^{2} nm, converting it into meters as follows:

1 nm=10^{-9} m

Thus,

2.5\times 10^{2} nm=1.5\times 10^{-7}m

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V=A×T

rearranging,

A=\frac{V}{T}=\frac{0.4769 m^{3}}{2\times 10^{-7}m}=2.38\times 10^{6}m^{2}

Thus, square meters of oil will be 2.38\times 10^{6}m^{2}


7 0
3 years ago
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