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3 years ago

neon has 10 electrons, 2 in the inner level and 8 in it's outermost level. how many valence electrons do neon atoms have?

Physics

2 answers:

Sedaia [141]3 years ago

6 0

Answer:

It's very simple- 8 valence electrons

lana [24]3 years ago

6 0

Answer:

it's 8

Explanation:

that the answer for the question

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How does a laser work?

a_sh-v [17]

Answer:

A laser is created when the electrons in atoms in special glasses, crystals, or gases absorb energy from an electrical current or another laser and become “excited.” The excited electrons move from a lower-energy orbit to a higher-energy orbit around the atom's nucleus.

7 0

3 years ago

A light ray is incident on a reflecting surface. If the light ray makes a 40° angle with respect to the normal to the surface, w

mash [69]

Answer:

40°

Explanation:

when a ray light is incident on a surface it makes a 40° angle with the normal to the surface (reflecting surface ). this called angle of incidence.

And the angle made by reflected ray with the normal to the surface is called angle of reflection.

by the law of reflection angle of incidence is equal to the angle of reflection

hence the answer to the question is 40° ( because ∠i =∠r )

7 0

3 years ago

A person with mass mp = 75 kg stands on a spinning platform disk with a radius of R = 1.59 m and mass md = 186 kg. The disk is i

Ad libitum [116K]

Answer:

1. $I_0=424.7208\,kg.m^2$

2. $I_f=256.1808\,kg.m^2$

3. $\omega_f=3.3158\,rad.s^{-1}$

4. $\Delta KE=558.8432\,J$

5. $a_c=5.8271\,m.s^{-2}$

6. $\omega_0=2\,rad.s^{-1}$

Explanation:

Given:

mass of the person, $m_p=75\,kg$

radius of the disk, $r=1.59\,m$

mass of the disk, $m_d=186\,kg$

initial angular speed of the disk, $\omega_0=2\,rad.s^{-1}$

distance of the person from the center of the disk, $d=0.53\,m$

Initial moment of inertia of the system when the man stands at the rim of disk:

Moment of inertia of the disc:

$I_D=\frac{1}{2} .m_d.R^2$

$I_D=\frac{1}{2} \times 186\times 1.59^2$

$I_D=235.1133\,kg.m^2$

Now for the person, we treat the mass to be a point revolving around R:

$I_P=m_p.R^2$

$I_P=75\times 1.59^2$

$I_P=189.6075\,kg.m^2$

∴We have the moment of inertia of the system in this case as:

$I_0=I_D+I_P$

$I_0=235.1133+189.6075$

$I_0=424.7208\,kg.m^2$

Moment of inertia when the person stands at 0.53 m from the center of the disk:

Moment of inertia of the disk will be constant:

$I_D=235.1133\,kg.m^2$

For the person, we treat the mass to be a point revolving around radius 0.53 m:

$I_P=75\times 0.53^2$

$I_P=21.0675\,kg.m^2$

∴We have the moment of inertia of the system

$I_f=I_D+I_P$

$I_f=235.1133+21.0675$

$I_f=256.1808\,kg.m^2$

The final angular velocity of the disk:

Using the conservation of angular momentum:

$I_0.\omega_0=I_f.\omega_f$

$424.7208\times 2=256.1808\times \omega_f$

$\omega_f=3.3158\,rad.s^{-1}$

Change in Kinetic Energy:

∵ $KE=\frac{1}{2} I.\omega^2$

∴ $\Delta KE= \frac{1}{2} (I_f.\omega_f^2-I_0.\omega_0^2)$

$\Delta KE=\frac{1}{2} (256.1808\times 3.3158^2-424.7208\times 2^2)$

$\Delta KE=558.8432\,J$

Centripetal acceleration of the person when she is at R/3:

Centripetal acceleration is given as:

$a_c=r'.\omega^2$

we have ω=3.3158 radian per second at R=0.53 m

$a_c=\frac{R}{3} .\omega^2$

$a_c=0.53\times 3.3158^2$

$a_c=5.8271\,m.s^{-2}$

If the person now walks back to the rim of the disk:

Then by the law of conservation of angular momentum the initial angular speed of $\omega_0=2\,rad.s^{-1}$ will be restored.

8 0

3 years ago

A student tied a small stone at one end of the string and whirled it above his head in a circular path by keeping the other end

strojnjashka [21]

Answer:

it would have hit his head. that's literally the possible answer

Explanation:

it would have hit his head or would've fallen on the opposite direction

8 0

3 years ago

A 2.80 kg mass is dropped from a height of 4.50 m. Find its potential energy when it reaches the ground.

marshall27 [118]

Answer:

123.48J

Explanation:

Given parameters:

Mass of the ball = 2.8kg

Height = 4.5m

Unknown:

Potential energy = ?

Solution:

The potential energy is the energy due to the position of a body. It is mathematically given as;

P.E = mgh

m is the mass

g is the acceleration due to gravity

h is the height

Now insert the parameters and solve;

P.E = 2.8 x 4.5 x 9.8 = 123.48J

5 0

3 years ago

Read 2 more answers

neon has 10 electrons, 2 in the inner level and 8 in it's outermost level. how many valence electrons do neon atoms have?​

neon has 10 electrons, 2 in the inner level and 8 in it's outermost level. how many valence electrons do neon atoms have?