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3 years ago

Explain how we know dark matter exists if we cannot see it

Physics

1 answer:

Lubov Fominskaja [6]3 years ago

5 0

Answer:

Gravitational lensing is how we know there is dark matter

What this means is that the light is bending as the light travels from the source to the observer, and if there are any 'holes' in between the beam, that is where 'dark matter' exists

Explanation:

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What are greenhouse gasses? How does carbon dioxide enter the atmosphere? (Site 1)

Alexxx [7]

Answer:

greenhouse gas is a gas that absorbs and emits radiant energy within the thermal infrared range

Explanation:

Animals and plants need to get rid of carbon dioxide gas through a process called respiration. Carbon moves from fossil fuels to the atmosphere when fuels are burned.

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3 years ago

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A wave has a period of 2 seconds and a wavelength of 4 meters. Calculate its frequency and speed. Note: Recall that the frequenc

Angelina_Jolie [31]

Answer:

frequency = 0.5 Hz and speed = 2 m/s

Explanation:

Given that,

The period of a wave, T = 2 s

Wavelength, $\lambda=4\ m$

If f be the frequency. So,

f = 1/T

$f=\dfrac{1}{2}\\\\f=0.5\ Hz$

Speed of a wave is given by :

$v=f\lambda\\\\v=0.5\times 4\\\\v=2\ m/s$

So, the frequency of the wave is 0.5 Hz and speed is 2 m/s.

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4 years ago

List three things you have done today that used kinetic energy.

Ede4ka [16]

I have thrown a ball during gym.
i have knocked my water bottle off my desk
i have opened a door.

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3 years ago

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Measuring the size of a specific object might include which of these SI units?

defon

D. Meter, Kilogram

Explanation:

There are certain units for the measurements things which are around us.
This is the SI units for the measurement of the size of the objects.
SI units are international unit systems, they are one who accepted around the world.
It is called the International System of Units, used to expresses the phenomenon happens around us in a scientific method
Here, the meter is the unit for Length in the International System of Units and Kilogram is to represent the mass of the object in SI units system.

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4 years ago

What is the area under the curve for the histogram below

igor_vitrenko [27]

Answer: B srry if i'm wrong

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2 years ago