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yarga [219]
3 years ago
15

How does conduction work?

Physics
1 answer:
pav-90 [236]3 years ago
8 0
Conduction works by transferring heat from one molecule to another through a substance. This occurs due to the readiness of the substance to allow molecules to move. A heated molecule moves and shakes rapidly, and some of its heat energy is passed to molecules around it.
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The intensity of light from a star (its brightness) is the power it outputs divided by the surface area over which it’s spread:
kow [346]

Answer:

\frac{d_{1}}{d_{2}}=0.36

Explanation:

1. We can find the temperature of each star using the Wien's Law. This law is given by:

\lambda_{max}=\frac{b}{T}=\frac{2.9x10^{-3}[mK]}{T[K]} (1)

So, the temperature of the first and the second star will be:

T_{1}=3866.7 K

T_{2}=6444.4 K

Now the relation between the absolute luminosity and apparent brightness  is given:

L=l\cdot 4\pi r^{2} (2)

Where:

  • L is the absolute luminosity
  • l is the apparent brightness
  • r is the distance from us in light years

Now, we know that two stars have the same apparent brightness, in other words l₁ = l₂

If we use the equation (2) we have:

\frac{L_{1}}{4\pi r_{1}^2}=\frac{L_{2}}{4\pi r_{2}^2}

So the relative distance between both stars will be:

\left(\frac{d_{1}}{d_{2}}\right)^{2}=\frac{L_{1}}{L_{2}} (3)

The Boltzmann Law says, L=A\sigma T^{4} (4)

  • σ is the Boltzmann constant
  • A is the area
  • T is the temperature
  • L is the absolute luminosity

Let's put (4) in (3) for each star.

\left(\frac{d_{1}}{d_{2}}\right)^{2}=\frac{A_{1}\sigma T_{1}^{4}}{A_{2}\sigma T_{2}^{4}}

As we know both stars have the same size we can canceled out the areas.

\left(\frac{d_{1}}{d_{2}}\right)^{2}=\frac{T_{1}^{4}}{T_{2}^{4}}

\frac{d_{1}}{d_{2}}=\sqrt{\frac{T_{1}^{4}}{T_{2}^{4}}}

\frac{d_{1}}{d_{2}}=\sqrt{\frac{T_{1}^{4}}{T_{2}^{4}}}

\frac{d_{1}}{d_{2}}=0.36

I hope it helps!

5 0
3 years ago
The quantities that have only magnitude are called vector quantities​.(T or F)
Afina-wow [57]

Answer:

F

Explanation:

When comparing two vector quantities you have to compare both magnitude and direction,but for scalar you only compare magnitude

8 0
2 years ago
Read 2 more answers
What is meant by"survival of the fittest" when referring to natural selection
Naddik [55]
Darwin theorized that animals (such as finches) would mate with the most suitable mate to produced offspring worthy of in-taking the environment it was born unto better than past generations. So, yeah, it's the animal's instincts that lead it to better survival.
4 0
3 years ago
A small chunk of wax floats if placed in water. If huge piece of wax that is as heavy as a
Fynjy0 [20]
The wax would float because of its weight
8 0
2 years ago
If the vehiche has a speed of 24.0 m/s at point a what is the force of the track on the vehicle at this point?
ASHA 777 [7]

Question:

A roller-coaster vehicle has a mass of 500 kg when fully loaded with passengers.  If the vehicle has a speed of 20.0 m/s at point A, what is the force exerted by the track on the vehicle at this point?

<em>See attachment</em>

Answer:

33700 Newton

Explanation:

Given

m = 500kg\\v = 24.0m/s\\r=10m

First, we determine the forces acting on mass m.

They are: the force exerted by the track (Fn) and the weight of the vehicle (W)

So, the net force is:

F_{net} = F_n - W

W=mg

So:

F_{net} = F_n - mg

Make Fn the subject

F_n = F_{net} + mg

Fnet is calculated as:

F_{net} = F_c = \frac{mv^2}{r} --- i.e. the centripetal force

So:

F_n = F_{net} + mg

F_n = \frac{mv^2}{r} + mg

F_n = \frac{500 * 24^2}{10} + 500 * 9.8

F_n = 28800 + 4900

F_n = 33700N

7 0
3 years ago
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