What kind of materials would you build your house out of to stay cool in a hot,

When atoms form a bond, it is usually because each atom acquires a more stable arrangement of electrons in its electron shells.

liraira [26]

C. Usually when an atom loses or gains an electron, it is because it is trying to satisfy the Octet Rule. The Octet Rule states that an atom is at its stablest when it has 8 valence electrons (two in helium's case)

If you look on the periodic table, elements on the left (Alkaline Metals) are the most reactive because they only have one valence electron (or electron in the outer shell). Elements on the right (Noble Gases) are the least reactive because they have a full outer shell of 8 valence electrons.

Later on you will find that as stability decreases as you go down the periodic table but that is a discussion for a different time.

4 0

3 years ago

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A 3874-kg rollercoaster is brought to the top of a 42m hill in 40 seconds,then drops 28m before the next hill.

Ede4ka [16]

(a) The work required to get the coaster to the top of the first hill is 1,594,538.4 J.

(b) The power required to bring the train to the top of the first hill is 39,863.46 W.

(c) The energy lost when the coaster drops is 531,512.8 J.

(d) The left at the bottom is determined as 1,063,025.6 J.

<h3>Work done to bring the rollercoaster top of the hill</h3>

W = Fn x d = mgh

W = 3874 x 9.8 x 42

W = 1,594,538.4 J

<h3>Power dissipated in bringing the rollercoaster on top hill</h3>

P = Fv

P = Fd/t

P = W/t

P = 1,594,538.4 /40 = 39,863.46 W

<h3>Energy lost when the coaster drops</h3>

E = 1,594,538.4 - (3874 x 9.8 x 28)

E = 531,512.8 J

<h3>Energy left at the bottom</h3>

E = 3874 x 9.8 x 28 = 1,063,025.6 J

Learn more about energy here: brainly.com/question/13881533

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6 0

2 years ago

Water accelerated by a nozzle to 35 m/s strikes the vertical back surface of cart moving horizontally at a constant velocity of

tangare [24]

Answer:

a) The brake force = -535.7N

b) acceleration = - 1.2m/s^2

Explanation: Please find the attached files for the solution.

3 0

3 years ago

A person, whose eye has a lens-to-retina distance of 2.0 cm, can only clearly see objects that are closer than 1.0 m away. what

shutvik [7]

To calculate the strength of the eye lens, we use the formula

$\frac{P}{100} = \frac{1}{f} =\frac{1}{u} +\frac{1}{v}$ ( thin lens formula)

Here, u is the object distance and v is image distance.

Given, $u =1 m=100cm$ and $v = 2 cm$

Therefore,

$\frac{1}{f} =\frac{1}{100} + \frac{1}{2}$

$\frac{1}{f} = 0.01 + 0.5$ $= 0.51 cm$

Thus, strength of the eye lens is

$P= \frac{100}{f} =\frac{100}{\frac{1}{0.51} } = 51 D$

5 0

3 years ago

A volleyball is knocked from rest to a velocity of 22 m/s over a time of 0.2

notsponge [240]

Answer:

$\boxed {\boxed {\sf 55 \ Newtons}}$

Explanation:

We are asked to find the force applied to the volleyball. According to Newton's Second Law of Motion, force is the product of mass and acceleration.

$F=ma$

We are given the mass, but we must calculate the acceleration.

1. Acceleration

Acceleration is the rate of change of velocity with respect to change. It is the change in velocity over the time.

$a= \frac{v_f-v_i}{t}$

The volleyball starts at rest or 0 meters per second and reaches a velocity of 22 meters per second in 0.2 seconds.

$v_f$ = 22 m/s
$v_i$ = 0 m/s
t= 0.2 s

Substitute the values into the formula.

$a= \frac{ 22 \ m/s - 0 \ m/s}{0.2 \ s}$

Solve the numerator.

$a= \frac{22 \ m/s}{0.2 \ s}$

Divide.

$a= 110 \ m/s^2$

2. Force

Now we know the mass and acceleration, so we can calculate the force.

$F=ma$

The mass is 0.5 kilograms and the acceleration is 110 meters per second squared.

m= 0.5 kg
a=110 m/s²

Substitute the values into the formula.

$F= 0.5 \ kg * 110 \ m/s^2$

Multiply.

$F= 55 kg*m/s^2$

1 kilogram meter per second squared is equal to 1 Newton, so our answer of 55 kg*m/s² is equal to 55 Newtons.

$F= 55 \ N$

<u>55 Newtons</u> of force are applied to the volleyball.

3 0

3 years ago