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elixir [45]
3 years ago
5

A neutral oxygen atom has 8 protons and 8 electrons. It gains 2 electrons when it chemically combines with magnesium to form mag

nesium oxide (MgO). What is the charge of oxygen in magnesium oxide?
Physics
1 answer:
maks197457 [2]3 years ago
6 0

Answer:

in this ionic compound, oxygen has 2 excess electrons and magnesium has two electrons missing.

Explanation:

When oxygen is mixed in a chemical reaction, it acquires two electrons from magnesium, to become an ion with 2 negative .

Mg + O → MgO

Therefore, in this ionic compound, oxygen has 2 excess electrons and magnesium has two electrons missing

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If a 40 kg gymnast and a 400 kg sumo wrestler each dropped from 1 m above the trampoline, find the final position of each athlet
Tomtit [17]
When you drop an object from some height on the spring objects initial potential energy is converted to kinetic energy, this kinetic energy is then used to compress the spring. Once all the energy is used the spring stops compressing and starts oscillating. 
We need to find how much the spring compressed in both cases.
From the above analysis, we can conclude that potential energy in the gravitational field has to be equal to the potential energy of compressed spring.
mgh=\frac{1}{2}kx^2
We solve for x (in our case h=1):
mg=\frac{1}{2}kx^2\\
x^2=\frac{2mg}{k}\\
x=\sqrt{\frac{2mg}{k}}
Now we just have to plug in the numbers:
$$Sumo\ wrestler(m=400kg):x=\sqrt{\frac{2mg}{k}}=0.81m\\

$$ Gymnast(m=40kg):x=\sqrt{\frac{2mg}{k}}=0.26m\\
8 0
3 years ago
1. Name three branches of<br> science.
mote1985 [20]

Answer:

Biology

Physics

Chemistry

Explanation:

Biology (life like cells, human reproduction, etc.)

Physics (Studies forces, like gravity.)

Chemistry (studies the atoms, the elements, etc.)

6 0
3 years ago
A 5.18x10^4 kg railroad car moves on a frictionless horizontal rails until it hits a horizontal spring stopper with a force cons
nalin [4]

Answer:

The initial velocity of the cart was 0.91m/s.

Explanation:

When the car comes to a stop it has delivered all of its kinetic energy to the spring; therefore,

\dfrac{1}{2}kx^2 = \dfrac{1}{2}  mv^2

solving for v we get:

v = x\sqrt{\dfrac{k}{m} },\\

we put in k = 4.21*10^{5}N/m, m = 5.18*10^{4}kg, and x = 0.32m to get:

v = (0.32m)\sqrt{\dfrac{4.21*10^5}{5.18*10^4} },\\

\boxed{v = 0.91m/s.}

4 0
4 years ago
Un vagón de 250 kg situado en la cima de una montaña rusa inicia su descenso por una rampa inclinado 60º sobre la horizontal. Si
earnstyle [38]
Um I don’t understand what your saying
6 0
3 years ago
What is the planet that scientists are exploring now?​
mina [271]

Answer:

Mars

Explanation:

In the 1960s, humans set out to discover what the red planet has to teach us. Now, NASA is hoping to land the first humans on Mars by the 2030s. Mars has captivated humans since we first set eyes on it as a star-like object in the night sky.

good luck

please mark me as a brainliest

5 0
3 years ago
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