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3 years ago

Please help!!!!! (and explain if you can) thank you so SO much!!! will give brainliest

Physics

2 answers:

Anna [14]3 years ago

4 0

Answer:

negative because it they oppose they are going to make the ball float (like when tried to put the same sides of magnets to touch)

Explanation:

Marina CMI [18]3 years ago

4 0

I believe it’s negative :)

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You're standing in a large room when a loud noise is made and you hear a series of echoes. Which characteristi

MrMuchimi

The correct answer is Reverberation (C)

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2 years ago

A cart rolling down an incline that is 60 meters long. If the cart has a beginning speed of 2.0 m/s and it

fiasKO [112]

Answer:

4 m/s²

Explanation:

Given:

Δx = 60 m

v₀ = 2.0 m/s

v = 22 m/s

Find: a

v² = v₀² + 2aΔx

(22 m/s)² = (2.0 m/s)² + 2a (60 m)

a = 4 m/s²

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3 years ago

Why does a balloon filled with the air from your lungs sink to the ground but a balloon filled with Helium floats ?

hoa [83]

Helium is lighter than air from the lungs.

Explanation:

A balloon filled with the air from lungs will sink to the ground but a balloon filled with Helium floats because helium is lighter than air.

Air is a mixture of many gases.

The air from the lungs is predominantly made up of carbon dioxide and water vapor.

Gram per mole of carbon dioxide is 44. Water vapor is 18.
Compared to helium which is 4, we see that the gas is lighter.
Since the gas is lighter, it will float in air.
The main component of air around us is nitrogen gas with a gram per mole of 28.
A balloon filled with more of air from the lungs weigh more than that will filled air around and even far more than helium gas.
This will cause a helium filled balloon to float.

learn more:

Density brainly.com/question/1698555

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3 years ago

Cookware companies have been using a chemical called C-8, which helps to create a nonstick coating to pans. However, the Environ

Nataly [62]

Cookware manufactures who make pans out of steel only

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3 years ago

Read 2 more answers

The human ear canal is about 2.9 cm long and can be regarded as a tube open at one end and closed at the eardrum. What is the fu

solniwko [45]

The frequency of the human ear canal is 2.92 kHz.

Explanation:

As the ear canal is like a tube with open at one end, the wavelength of sound passing through this tube will propagate 4 times its length of the tube. So wavelength of the sound wave will be equal to four times the length of the tube. Then the frequency can be easily determined by finding the ratio of velocity of sound to wavelength. As the velocity of sound is given as 339 m/s, then the wavelength of the sound wave propagating through the ear canal is

Wavelength=4*Length of the ear canal

As length of the ear canal is given as 2.9 cm, it should be converted into meter as follows:

$wavelength = 4*2.9*10^{-2} =0.116$

Then the frequency is determined as

f=c/λ=339/0.116=2922 Hz=2.92 kHz.

So, the frequency of the human ear canal is 2.92 kHz.

4 0

3 years ago

Please help!!!!! (and explain if you can) thank you so SO much!!! *will give brainliest*

Please help!!!!! (and explain if you can) thank you so SO much!!! will give brainliest