2 years ago

Which of the following types of waves can transmit only through matter? Select all that apply. (Hint: there are 2)

1 answer:

7 0

A) seismic waves
b) sound waves

sound waves are traveling vibrations of particles in media (air, water, metal, etc) so they can’t travel through empty space (vacuums) because there are no atoms or molecules to vibrate.

seismic waves are mechanical waves and require a medium for propagation, hence, they cannot travel through a vacuum.

hope this helps :)

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A 25 kg child is riding on a swing. If the child travels 8.9 m/s at the bottom of their swing, how high into the air is the chil

Setler [38]

Answer:

h = 4.04 m

Explanation:

Given that,

Mass of a child, m = 25 kg

The speed of the child at the bottom of the swing is 8.9 m/s

We need to find the height in the air is the child is able to swing. Let the height is h. Using the conservation of energy such that,

$mgh=\dfrac{1}{2}mv^2\\\\h=\dfrac{v^2}{2g}$

Put all the values,

$h=\dfrac{(8.9)^2}{2\times 9.8}\\\\h=4.04\ m$

So, the child is able to go at a height of 4.04 m.

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3 years ago

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Anastasy [175]

The popularity of modern sports help advance a society by bringing people together.

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3 years ago

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Lady_Fox [76]

B) equal in magnitude but opposite direction

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3 years ago

What do we mean by principle of conservation?

leonid [27]

Answer:

Conservation principles tell us that some<u> quantity, quality, or aspect remains constant through change. </u>

Explanation:

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3 years ago

A baseball fan is 150.0 m from the home plate. how much time elapses between the instant the fan sees the batter hit the ball an

Artyom0805 [142]

Approximately 0.4373 seconds

Speed of sound at 20 degree C is roughly 343 meters/second

Speed of light = 3x10^8 or 300,000,000 meters/second

at 150.0 feet away you set it up as:

150.0/343 - 150/3x10^8

150.0/343 = 0.43731778

150/3x10^8 = 5x10^-7 or 0.0000005

Subtract 0.43731778 - 0.0000005

Answer is 0.43731728

Rounding would be approx. 0.4373

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3 years ago