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3 years ago

How many electrons does a neutral atom of oxygen-18 have? 8 O 16.00

Physics

2 answers:

galina1969 [7]3 years ago

7 0

Answer:

A. 8

Explanation:

Atomic number of oxygen = 8

Oxygen is the 8th element in periodic table.

Atomic no. = 8, means one oxygen atom has 8 protons. Now, because the atom is neutral, so number of electrons = no. of protons in an atom.

Hence, the number of electrons in a neutral oxygen atom is 8.

soldi70 [24.7K]3 years ago

5 0

Answer:A

Explanation:The answer is a because a neutral atom of oxygen is represented as O. It is atomic number of 8. Hence, it contains 8 electrons and 8 protons.

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Assuming that 50% of the initial kinetic energy of the bullet is converted into thermal energy in the bullet and the specific he

DedPeter [7]

Answer:

$\Delta T=\frac{v_{i}^{2}}{4c}$

Explanation:

Let the mass of bullet is m, initial velocity of bullet is vi and c be the specific heat of the bullet.

Kinetic energy, K = 1/2 mvi^2

According to the question, 50% of the kinetic energy is equal to the heat energy absorbed by the bullet.

50% of K = mass of bullet x specific heat x rise in temperature

1/4 mvi^2 = m x c x ΔT

$\Delta T=\frac{v_{i}^{2}}{4c}$

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4 years ago

Material from which of the following solar occurrences can reach Earth, causing radio blackouts? A. Coronal mass ejection B. Pro

Fittoniya [83]

its A. coronal mass ejection

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4 years ago

Read 2 more answers

Q2. EXPLAIN THE CONSTRUCTION AND

Oksi-84 [34.3K]

Answer:

The working of an electric motor is based on the assumption that a conductive current generates a magnetic field around it. Consider the following situation,

Take two bar magnets, and leave a small space between the poles facing each other. Now, take a small conductive wire length and make a loop. Keep this connection between the magnets, so that it is still inside the magnet’s area of influence. Now for the final part. Attach loop ends to battery terminals.

As electricity flows through your simple circuit, you will find that your loop “moves.” The magnet’s magnetic field interferes with that generated by the conductor’s electrical current flow. Because the loop has become a magnet, it will draw one side of it to the magnet’s north pole, and the other to the south pole. That causes the loop to rotate continuously. This is the idea of an electric motor working.

7 0

3 years ago

Calculate the average speed of the moon around the earth. The moon has a period of revolution of 27.3 days and an average distan

klio [65]

<h2>The average speed of the moon around the earth is 1021.74 m/s</h2>

Explanation:

Radius of moon around earth, r = 3.84 × 10⁸ m

Circumference of orbit = 2πr = 2 x 3.14 x 3.84 × 10⁸

Circumference of orbit = 2.41 x 10⁹ m

Time taken, t = 27.3 days = 27.3 x 24 x 60 x 60 = 2358720 seconds

We have

Circumference of orbit = Speed of moon x Time taken

2.41 x 10⁹ = Speed of moon x 2358720

Speed of moon = 1021.74 m/s

The average speed of the moon around the earth is 1021.74 m/s

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3 years ago

A horizontal disk rotates about a vertical axis through its center. Point P is midway between the center and the rim of the disk

rjkz [21]

<u>If the disk turns with constant angular velocity, the following statements about it are true </u>

The linear acceleration of Q is twice as great as the linear acceleration of P
is moving twice Q as fast as P.

Answer: Options D and E

<u>Explanation: </u>

Let us consider that R is the radius of the circular disc. So as Q is on the rim, so the distance of Q from the centre of the disc is R and as P is the midpoint between centre and rim of the disk, so the distance of P from the centre is R/2.

As we know that the angular velocity of the circular disk will be equal to the ratio of distance covered by that point to the time taken. So the angular velocity at point Q will be

$\text { Angular velocity at point } Q=\frac{\text { Distance covered by point } Q}{\text { Time }}=\frac{2 \pi R}{T}=v$

As R is the distance of point Q from the centre of the disc.

Similarly ,

$\text { Angular velocity at point } P=\frac{\text { Distance covered by point } P}{\text { Time }}=\frac{2 \pi\left(\frac{\mathrm{R}}{2}\right)}{T}=\frac{\pi R}{T}=v^{\prime}$

So if we equate v with v’ we obtain that

$v=2 v^{\prime}$

Therefore, the point Q will be moving twice as fast as P. As the velocity of Q is more than O, the linear acceleration of point Q will also be twice as great as the linear acceleration of P.

This is because acceleration is directly proportional to the rate of change in velocity. So if velocity increases in the factor of 2, the acceleration of point Q will also increase twice with respect to point P.

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4 years ago