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Alex_Xolod [135]

3 years ago

9

Calculate the centripetal force (in N) on the end of a 44 m (radius) wind turbine blade that is rotating at 0.7 rev/s. Assume th

e mass is 8 kg.

2 answers:

irakobra [83]3 years ago

5 0

Eeffxswf fgtwazfhj vgrwazf

Andrews [41]3 years ago

4 0

Hmmm ummm hhhhmmmm uhhhhmmmmmmmmmmmm hmmmm

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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

Which choice would reveal a chemical property of water?

r-ruslan [8.4K]

Answer:

D

Explanation:

Testing The PH Means Testing The acidity level of the water of which would be a chemical reaction

8 0

3 years ago

A parking lot is going to be 60 m wide and 240 m long. what dimensions could be used for a scale model of the lot?

Zanzabum

Answer:

it is 20cm x 80cm

Explanation:

just did it on apex

7 0

4 years ago

Read 2 more answers

If a bird collides with the windshield of a fast-moving bus, Which one experiences and impact force with larger magnitude? Which

Ugo [173]

Both of them experience the same force in magnitude due to newtons third law. however, the one with the smallest mass experiences the greater acceleration due to newtons second law (F=ma) in which a=F/m

3 0

4 years ago

A sonar pulse is sent from one submarine to another submarine, where it is reflected and returned. If the round trip takes 6 sec

ipn [44]

Answer:

4283.64 m away

Explanation:

$\beta$ = Bulk modulus

$\rho$ = Density

Speed of sound in a material is given by

$v=\sqrt{\frac{\beta}{\rho}}\\\Rightarrow v=\sqrt{\frac{2.1\times 10^9}{1030}}\\\Rightarrow v=1427.88\ m/s$

If the round trip takes 6 seconds then the one way trip wil take 3 seconds

Distance = Speed × Time

$Distance=1427.88\times 3=4283.64\ m$

So, the other submarine is 4283.64 m away

5 0

4 years ago