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4 years ago

The death of a star occurs when its _____ stops.

2 answers:

6 0

Nuclear fusion
Stars fuse hydrogen into helium (and depending, also carbon, oxygen, neon, magnesium, silicon, and iron but that's complicated) to resist the force of immense gravity, in order to retain its shape.

Elena-2011 [213]4 years ago

4 0

the answer is: Nuclear fusion

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Examine the graph showing the half-life of the radioactive isotope substance x.

kow [346]

Answer:

T_{1/2} = 5,776 10³ years

We see this life time as it is very close to the life time of carbon 14, so it could be used for dating ancient objects

Explanation:

The radioactive decay of described by an equation of the form

N = N₀ $e^{-\lambda t}$

where N is the number of atoms present, N₀ is the number of initial atoms λ is the activity of the material.

The average life time is defined as the time for which the number of remainng atoms is N = N₀ / 2

$T_{1/2}$ = ln 2 /λ

With these expressions, the best method to determine the average life time is to find the activity of the first equation.

For this we look for a point on the graph as accurate as possible,

N₀ = 100, N = 30 and t = 10,000 years

we substitute in the equation

30 = 100 e^{-\lambda 10000}

ln 0.3 = - λ 10000

λ = - (ln 0.3) / 10000

λ = 1.2 10-4

now we can find the average life time

$T_{1/2}$ = ln 2 / 1,2 10-4

T_{1/2} = 5,776 10³ years

We see this life time as it is very close to the life time of carbon 14, so it could be used for dating ancient objects

8 0

4 years ago

How is the movement of molecules that you observed in both the cases connected to their mass and temperature?

Brilliant_brown [7]

Well by the amount that you weigh by different galaxies

8 0

4 years ago

A forklift raises a crate weighing 8.35 × 102 newtons to a height of 6.0 meters. What amount of work does the forklift do?

Vinil7 [7]

Answer:

5010J

Explanation:

Work is force times distance, or

W=F⋅d.

Substitute in values from the question to get

W=8.35⋅102N⋅6m=50.1⋅102Nm=5010J

6 0

3 years ago

Read 2 more answers

Is the square root of gravity equal to pi ?

Kisachek [45]

This is more to do with mathematics than physics,
but the square root of gravity on its own means nothing, its simply a acceleration due to gravity near the earth surface.
trying to find the speed of a falling object is a simple conservation of energy problem, then it has a meaning in that context.
however standing alone, it has no bearing to the real world. it is simply a mathematical term or construct we use in order to explain the real world. you see this all over the place in physics, you just have to get used to it.
for example:
mv^2=mhg
v^2=gh
v= SQRT(gh)
=SQRT(g)SQRT(h)
so SQRT means nothing on its own, simply a mathematical term to used to calculate the effects and actions in the real world.
i cant really compare it to Pi, sorry
but i hope you have a better understanding :)

5 0

4 years ago

Which graph represents the solution set of the system of inequalities? {−2x+y≤4y>x+2

Jet001 [13]

Answer:

The fourth graph is the answer

Explanation:

We have inequalities

$-2x+y\leq 4$ $\rightarrow y\leq 2x+4$

$y>x+2$

For the first inequality all points at or below the graph of y are solutions, and for the second inequality all the points above the graph of y are the solutions. So, the solution to these inequalities are points that are above the graph of $y>x+2$ and below the graph of $y\leq 2x+4$ . The shaded region in the fourth graph satisfies these conditions.

Looking at other choices, we see that the first two graphs do not even represent the graphs of our inequalities, and the third graph does represent the inequalities but shades the wrong region.

P.S: the graph of the inequality $y>x+2$ is dashed because $y$ is "greater than" and not "equal to" $x+2$ , so this indicates that the values on the line $y=x+2$ are not included. And the graph of the inequality $y\leq 2x+4$ is a solid line because $y$ is "less than or equal to" $2x+4$ , so we are including the values on the line $y=2x+4$ , and that's why it's solid.

6 0

3 years ago

Read 2 more answers