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lora16 [44]
3 years ago
11

Under some circumstances, a star can collapse into an extremely dense object made mostly of neutrons and called a neutron star.

The density of a neutron star is roughly 1014 times as great as that of ordinary solid matter. Suppose we represent the star as a uniform, solid, rigid sphere, both before and after the collapse. The star's initial radius was 7.0x10^5 km (comparable to our sun); its final radius is 16 km .If the original star rotated once in 35 days, find the angular speed of the neutron star.
Physics
1 answer:
xxTIMURxx [149]3 years ago
4 0

Answer:

The angular speed of the neutron star is 3976.978\ rads^{-1}

Solution:

As per the question:

Initial radius of the star, r = 7.0\times 10^{5}\ km = 7\times 10^{8}\ m

Final Radius, r' = 16 km

Period of rotation of the star, T = 35 days = 35\times 24\times 3600 = 3024000\ s

Now,

To calculate the angular speed of the neutron star:

We use the principle of conservation of angular momentum:

I\omega = I'\omega'

where

I = Moment of inertia

\omega = \frac{2\pi}{T}

(7\times 10^{8})^{2}\times \frac{2\pi}{T} = (16000)^{2}\omega'

\omega = 3976.978\ rads^{-1}

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zlopas [31]

You would have to give it more mechanical energy.

Like, strap a bunch of powerful rockets to one side of the moon, with all of them pointing in the direction that the moon is already moving in its orbit.  Then blast away.

NOTE:  There aren't enough rockets or rocket fuel on Earth to make a difference, even if you used ALL of them.  The mass of the moon is about

<em>73,476,730,900,000,000,000,000 kilograms</em>

(rounded to the nearest hundred trillion kilograms.)

That's a lot.

5 0
3 years ago
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The energy band gap of GaAs is 1.4 eV. Calculate the optimum wavelength of light for
notsponge [240]

Answer:

The optimum wavelength = (8.863 × 10⁻⁷) m = 886.3 nm

Explanation:

The light that will generate the photovoltaic energy of 1.4 eV will must have that amount of energy

Energy of light waves is given as

E = hf

h = Planck's constant = (6.626 × 10⁻³⁴) J.s

f = Frequency of the light

The frequency is then further given as

f = (c/λ)

c = speed of light = (3.0 × 10⁸) m/s

λ = wavelength of the light = ?

E = (hc/λ)

λ = (hc/E)

Energy = E = 1.4 eV = 1.4 × 1.602 × 10⁻¹⁹ = (2.2428 × 10⁻¹⁹) J

λ = (6.626 × 10⁻³⁴ × 3.0 × 10⁸)/(2.2428 × 10⁻¹⁹)

λ = (8.863 × 10⁻⁷) m = 886 nm

Hope this Helps!!!

3 0
3 years ago
According to quantum physics, measuring velocity of a tiny particle with an electromagnet
lidiya [134]

Answer:

Option A.

Explanation:

In quantum physics <u>there is a law to relate the position and the momentum of the particle</u>, it says that if we know with precision where is a quantum particle, we can not know the momentum of this particle, in other words, the velocity of the particle. So, when we measure the velocity of the particle we find the correct value of the particle, but we can not determine with accuracy where is the particle. This law is known as the Heisenberg's uncertainty principle and, its expressed as follows:    

\Delta x \Delta p \geq \frac{h}{4 \pi}

<em>where Δx: is the position's uncertainty, Δp: is the momentum's uncertainty and h: is the Planck constant.</em>  

Therefore, the correct answer is A: measuring the velocity of a tiny particle with an electromagnet has no effect on the velocity of the particle. It only affects the determination of the particle's position.      

I hope it helps you!

4 0
3 years ago
Roughly how many stars are in the Milky Way Galaxy?
svetlana [45]

Answer:

there are many stars in the milky way galaky

Explanation:

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7 0
3 years ago
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What is the acceleration of a 1107 kg car as it comes to rest with a force of 2242 N in 6.9 seconds?
xz_007 [3.2K]

acceleration is 2.025m/s².

4 0
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