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4 years ago

What happens when a star comes to an end?

Physics

2 answers:

nlexa [21]4 years ago

7 0

Answer:

It depends on the size of the star but I think it's B

Explanation:

If the star is massive, it will eventually explode (supernova) and if it is a star with a high mass, the core of it will form a neutron star and if it is very massive the core will turn into a blackhole

Elena-2011 [213]4 years ago

4 0

Answer:

Explanation:

It can become a black hole

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Two long, straight wires are parallel and 10 cm apart.One carries a current of 2.0 A, the other a current of 5.0A. (a) If the tw

lubasha [3.4K]

Answer:

Explanation:

Given

Distance between two wires $d=10 cm$

Current value $i_1=2 A$

$i_2=5 A$

(a)If current flows in opposite direction

When current Flows in opposite direction the two wires will repel each other

Force due to current carrying wire $F=\frac{\mu _0i_1i_2}{2\pi r}$

$F_{12}=F_{21}=\frac{\mu _0\times 2\times 5}{2\times \pi \times 0.1}$

$F_{12}=\frac{4\pi \times 10^{-7}\times 2\times 5}{2\pi \times 0.1}$

$F_{12}=2\times 10^{-5} N$ (Repulsive Force)

(b)If current is flowing in the same direction

When direction of current is same then force will be attractive in nature

$F_{12}=F_{21}=\frac{\mu _0i_1i_2}{2\pi r}$

$F_{12}=\frac{4\pi \times 10^{-7}\times 2\times 5}{2\pi \times 0.1}$

$F_{12}=2\times 10^{-5} N$ (attractive Force)

5 0

4 years ago

The current in the electron beam of a typical video display terminal is 200 µa. How many electrons strike the screen each minute

noname [10]

The number of electrons strike the screen each minute when thee current in the electron beam of a typical video display terminal is 200 µa is 7.5×10¹⁶.

<h3>How to calculate electric charge?</h3>

Electric charge is equal to the product of electricity current flowing and the total time. It can be given as,

$q=It$

Here, I is current and t is time.

The current in the electron beam of a typical video display terminal is 200 µa for one minute. Thus, the total charge is,

$q=200\times10^{-6}\text{ A}\times(60\text{ s})\\q=0.012\rm \;C$

The number of electron flow is the ratio of total charge to the charge of one electron. The charge on one electron is 1.6×10⁻¹⁹ C. Thus, the number of electron is,

$n=\dfrac{0.012}{1.6\times10^{-19}}\\n=7.5\times10^{16}$

Thus, the number of electrons strike the screen each minute when the current in the electron beam of a typical video display terminal is 200 µa is 7.5×10¹⁶.

Learn more about the electric charge here;

brainly.com/question/2373424

#SPJ4

3 0

3 years ago

When can a high speed velocity cause damage?'

sweet-ann [11.9K]

Answer:

50 Mph.

Explanation:

According to the National Severe Storms Laboratory, winds can really begin to cause damage when they reach <em><u>50 mph</u></em>. But here’s what happens before and after they reach that threshold, according to the Beaufort Wind Scale (showing estimated wind speeds): - at 19 to 24 mph, smaller trees begin to sway.

7 0

3 years ago

FM radio means what?

lina2011 [118]

Answer:

frequency measured in megahertz

6 0

2 years ago

You hear the sound of the firing of a distant cannon 6.9 s after seeing the flash. how far are you from the cannon? (assume 343

EastWind [94]

Let's call d the distance of the cannon from us. We see the flash first, then after 6.9 s we hear the sound. The flash arrives to us traveling at speed of light, which is $c=3 \cdot 10^8 m/s$ , while the sound travels at speed $v=343 m/s$ . Since the magnitude of the speed of light is much much larger than the speed of sound, we can assume that the flash arrives at our location instantaneously after the firing.
Then we can say that the sound wave covers a distance d traveling at speed v in a time of t=6.9 s. Since it is a uniformly linear motion, the distance covered by the sound wave is
$d=vt=(343 m/s)(6.9 s)=2367 m$
So, this is the distance of the cannon from us.

6 0

3 years ago