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3 years ago

An element's atomic number is 7. How many electrons would an atom of this element have?

Physics

1 answer:

almond37 [142]3 years ago

5 0

Hey There!

The atomic number represents the electrons and protons, therefore, if the atomic number of the element is 7 then there are 7 electrons and protons in the element.

In order to determine the amount of neutrons, you would subtract the atomic number from the atomic mass.

Hope this helped!

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Some believe that the positions of the planets at the time

laila [671]

Answer:

$1.4007\times 10^{-8}\ N$

$1.50075\times 10^{-6}\ N$

$0.000000667\ N$

Explanation:

$m_1$ = Mass of baby = 3 kg

G = Gravitational constant = 6.67 × 10⁻¹¹ m³/kgs²

r = Distance between objects

Gravitational force of attraction is given by

$F=\dfrac{Gm_1m_2}{r^2}\\\Rightarrow F=\dfrac{6.67\times 10^{-11}\times 70\times 3}{1^2}\\\Rightarrow F=1.4007\times 10^{-8}\ N$

The force between baby and obstetrician is $1.4007\times 10^{-8}\ N$

$F=\dfrac{6.67\times 10^{-11}\times 3\times 2.7\times 10^{27}}{(6\times 10^{11})^2}\\\Rightarrow F=1.50075\times 10^{-6}\ N$

The force between the baby and Jupiter is $1.50075\times 10^{-6}\ N$

$F=\dfrac{6.67\times 10^{-11}\times 3\times 2.7\times 10^{27}}{(9\times 10^{11})^2}\\\Rightarrow F=0.000000667\ N$

The force between the baby and Jupiter is $0.000000667\ N$

7 0

3 years ago

An astronaut in a space craft looks out the window and sees an asteroid move pas a backward direction at 68 mph relative to the

Annette [7]

Answer: -194 mph

Explanation:

Taking into account the Sun as the center (origin, point zero) of the reference system, the velocity of the spacecraft relative to the Sun $V_{R-S}$ is:

$V_{R-S}=126mph$ Note it is positive because the spacecraft is moving away from the Sun

Taking into account the spacecraft as the center of another reference system, the velocity of the asteroid relative to the spacecraft $V_{A-R}$ is:

$V_{A-R}=-68mph$ Note it is negative because the asteroid is moving towards the spacracft.

Now, the velocity of the asteroid relative to the Sun $V_{A-S}$ is:

$V_{A-S}=V_{A-R}-V_{R-S}$

$V_{A-S}=-68mph-126mph$

Finally:

$V_{A-S}=-194mph$ This is the velocity of the asteroid relative to the Sun and its negative sign indicates it is moving towards the Sun.

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The gravitional energy of an object is always measured realative to the ?

zaharov [31]

I would say that the answer would be MASS.

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Which event in the “The Medicine Bag” is most symbolic of Martin beginning to connect with his Sioux heritage?

Sophie [7]

Answer:

A- Martin brings his friends home to meet grandpa.

Explanation:

took the test.

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The three branches of science earth and physicals

seropon [69]

Science is always defined as the body of knowledge and linked to something related to the physical world, phenomena and lives of everything that exist on Earth. Science is categorized in various ways. Pure, practical or theoretical, is the largest distinction of science or whether science is applied. Generally, pure science is subdivided into Physical sciences, Earth sciences, and Life sciences. Physical sciences deal with energy and matter, Earth sciences explain Earth’s phenomena, to the solar system where it belongs and its atmosphere. And finally, life sciences describe internal processes of living organisms, its relationship to each other and to its environment.

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