angi17e

17.09.2019 • 

Chemistry

Which statements about the formation of the solar system are true and in a correct order?
a.
a black hole collapsed to form the sun; small planetary objects formed; small planetary objects collided with each other to form larger objects.
b.
most of the dust and gas contracted into a central mass—the sun; half the mass of the cloud condensed to form jupiter; asteroids and comets crashed into the sun to form the smaller planets.
c.
a spinning cloud of dust began to compress to form the sun; small planetary objects formed; hydrogen and helium became concentrated in the outer solar system to form the outer planets.
d.
gravitational force held the newly formed planets around the sun; small planetary objects formed; hydrogen and helium became concentrated in the outer solar system to form the outer planets.

Ответ:

aubriebv2020

02.01.2022

Chemistry

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The statement about the formation of the solar system that are true and in a correct order are Gravitational force held the newly formed planets around the sun; small planetary objects formed; hydrogen and helium became concentrated in the outer solar system to form the outer planets. The answer is letter D.

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Ответ:

hey2000

30.11.2022

Chemistry

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Mark me brill plz

Explanation:

you have E= mv^2 /2

so v^2 = 2E/m  m of neutron =1.67 10^(-27) kg  

so v^2 = 2E/m     E = kT = 1.38 10^-23*300 =4.14 10^(-21) J

v^2 = 2*4.14 10^(-21)/1.67 10^(-27) =4.96 10^6 m^2s^-2

v=2.227 10^3 m/s

And

lambda = 6.6210^(-34)/(2.22710*3)*1.67 10^(-27)  

lambda=1.78 10^(-10)m =0.178 nm

please verify the calculus

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