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3 years ago

Someone help me please.

Physics

1 answer:

Alekssandra [29.7K]3 years ago

7 0

Answer:

ionic

covalent

covalent (i think)

Explanation:

ionic= donate electrons (gain/lose)... (results in ions that have +/- charge, are no longer neutral)

covalent= share electrons

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To initiate a nuclear reaction, an experimental nuclear physicist wants to shoot a proton into a 5.50-fm-diameter 12C nucleus. T

Crazy boy [7]

Answer:

The value is $u = 3.23 *10^{7} \ m/s$

Explanation:

From the question we are told that

The diameter of the nucleus is $d = 5.50 \ fm = 5.50 *10^{-15} \ c$

The charge of the proton that makes up the nucleus is $Q_2 = \frac{12}{2} * 1.60 *10^{-19} =9.6*10^{-19} \ C$

The energy to be impacted is $KE_f = 2.30 \ MeV = 2.30 *10^{6} \ eV = 2.30 *10^{6} * 1.60 *10^{-19} = 3.68*10^{-13} \ J$

Generally the radius of the nucleus is mathematically represented as

$r = \frac{d}{2}$

=> $r = \frac{5.50 *10^{-15}}{2}$

=> $r = 2.75 *10^{-15} \ m$

Generally from the law energy conservation we have that

$Initial \ total \ energy \ of the \ proton = final \ total \ energy \ of the \ proton$

i.e

$T_i = T_f$

Here

$T_i = KE_i + PE_i$

Here $KE_i$ is the initial kinetic energy which is mathematically represented as

$KE_I = \frac{1}{2} * m * u ^2$

Here $PE_i$ is the initial potential energy of the proton and the value is 0 J given that the proton is moving

Also $T_f$ is mathematically represented as

$T_f = KE_f + PE_f$

Here

$PE_f$ is the final potential energy which is mathematically represented as

$PE_f = \frac{k * Q_1 * Q_2}{r}$

Here $Q_1$ is the charge on the proton with a value of $Q_1 = 1.60 *10^{-19} \ C$

$PE_f = \frac{9*10^{9} *(1.60 *10^{-19} ) * ( 9.6 *10^{-19})}{ 2.75 *10^{-15}}$

=> $PE_f = 5.027 *10^{-13 } \ J$

$KE_i + PE_i = KE_f + PE_f$

=> $\frac{1}{2} * m * u ^2 +0 = 3.68*10^{-13} + 5.027 *10^{-13 }$

Here m is the mass of the moving proton with value $m = 1.67*10^{-27} \ kg$

$\frac{1}{2} * 1.67*10^{-27} * u ^2 +0 = 3.68*10^{-13} + 5.027 *10^{-13 }$

=> $u = \sqrt{\frac{3.68*10^{-13} + 5.027 *10^{-13 }}{0.5 * 1.67*10^{-27}} }$

=> $u = 3.23 *10^{7} \ m/s$

5 0

3 years ago

1. Explain how a boulder at rest on the ground can actually be moving at the same time.

Mars2501 [29]

Answer:

I don't know about the 1st one but An object at rest stays at rest and an object in motion stays in motion at a constant speed and direction unless acted upon by an unbalanced force. Or maybe its moving because the earth is moving and gravity is pulling it with.

2. Speed is the rate at which something or someone is able to move. Instantaneous Speed - the speed at any given instant in time. Average Speed - the average of all instantaneous speeds; found simply by a distance/time ratio.

3. Speed = distance divided by time or $s=\frac{d}{t}$ . Some units for speed can be miles, kilometres, feet, or metres.

4. Speed is the time rate at which an object is moving along a path, while velocity is the rate and direction of an object's movement. Put another way, speed is a scalar value, while velocity is a vector.

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3 years ago

What colors are included in our visible spectrum?

777dan777 [17]

ALL colors are in the visible spectrum.

"Color" is a word we use to describe light that our eyes can detect. If the light has a "color", that means we can see it, and somebody gave it a name. If we can't see it, then we don't have a "color" to describe it.

Every color that has ever been perceived by human eyes is present in the humanly-visible spectrum, except "black".

There are at least hundreds of them. Probably thousands. Maybe millions.

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3 years ago

Help!!!!!!!!!!!!!!!!!!! I need someone to check my homework, I will give you 50 points if you answer!!!

bogdanovich [222]

I might be incorrect but I’m pretty confident that all of it is right. I think you’re good.

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Câu 1. Trường hợp nào dưới đây không phải là vật sáng?

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Answer:

Explanation:

A. The pencil is on the table in broad daylight

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3 years ago