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3 years ago

Which is an example of the gravitational force?

Physics

2 answers:

Evgesh-ka [11]3 years ago

7 0

1. A basketball was thrown in the air and falls to the ground

Sergeeva-Olga [200]3 years ago

6 0

Answer:

1.a basketball that was thrown in the air falls to the ground

Explanation:

1.a basketball that was thrown in the air falls to the ground

From newton law of universal gravitation, it state that a object of any mass will have the tendency to come down when throw to the atmosphere.

this is the reason why acceleration due to gravity of any object thrown up are always the same. Acceleration due to gravity on earth is 9.8 m/s2.

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True Or False: people in the U.S. consume more liters of water than those in developing nations.

Andru [333]

Truee hope this helps

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3 years ago

Erica is working in the lab. She wants to remove the fine dust particles suspended in a sample of oil. Which method is she most

mash [69]

Option a is right answer that is reverse osmosis.

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3 years ago

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A photon of wavelength 192 nm strikes an aluminum surface along a line perpendicular to the surface and releases a photoelectron

alex41 [277]

Answer:

$KE=3.529\times10^{−27}\ J$

Explanation:

Given that

Wavelength λ=192 nm

So energy of photon,E

$E=\dfrac{hC}{\lambda }$

Now by putting the values

$h=6.6\times 10^{-34}\ m^2.kg/s$

$C=3\times 10^{8}\ m/s$

$E=\dfrac{6.6\times 10^{-34}\times 3\times 10^{8}}{192\times 10^{-9} }$

$E=1.03\times 10^{-18} J$

We know that

Kinetic energy given as

$KE=\dfrac{P^2}{2m}$

$KE=\dfrac{E^2}{2mC^2}$

$KE=\dfrac{(1.03\times 10^{-18})^2}{2\times 1.67\times 10^{-27}(3\times 10^8)^2}$

$KE=3.529\times10^{−27}\ J$

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3 years ago

In a nuclear reaction, which of the following must be conserved?

AfilCa [17]

Answer:

Explanation:

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3 years ago

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What is the concentration of H+ ions at a pH = 7? mol/L What is the concentration of OH– ions at a pH = 7? mol/L What is the rat

AnnZ [28]

<h3><u>Answer;</u></h3>

= 0.0000001 mol/L

= 1:1

<h3><u>Explanation;</u></h3>

What is the concentration of H+ ions at a pH = 7?

The formula for ph is given by:

pH=−log10[H+]

In calculating for the concentration of hydrogen ion, the formula is given by:

[H+]=(10)^(-pH)

Therefore; at pH = 7

[H+]=(10)^(-7)

<u>= 0.0000001 mol/L </u>

What is the concentration of OH– ions at a pH = 7?

pH+pOH=14

7+pOH=14

pOH= 7

[OH-]=(10)^(-pOH)

[OH-]=(10)^(-7)

<u>= 0.0000001 mol/L </u>

What is the ratio of H+ ions to OH– ions at a pH = 7?

1:1

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3 years ago

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