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4 years ago

What is definition of population?

Physics

1 answer:

Oksanka [162]4 years ago

5 0

All the inhabitants of a particular place or town, area or country

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A 89.3 kg horizontal circular platform rotates freely with no friction about its center at an initial angular velocity of 1.77 r

balu736 [363]

Answer:

$\omega_{2} = 1.107\,\frac{rad}{s}$

Explanation:

Let assume that circular platform is a solid cylinder. Given the absence of external forces, the situation can be analyzed by applying the Principle of Angular Momentum, which states that:

$I_{1}\cdot \omega_{1} = I_{2}\cdot \omega_{2}$

The initial moment of inertia is:

$I_{1} = \frac{1}{2}\cdot (89.3\,kg)\cdot (1.69\,m)^{2}$

$I_{1} = 127.525\,kg\cdot m^{2}$

Likewise, the final moment of inertia is:

$I_{2} = 127.525\,kg\cdot m^{2} + (8.83\,kg)\cdot (1.352\,m)^{2} + (21.1\,kg)\cdot (1.69\,m)^{2}$

$I_{2} = 203.929\,kg\cdot m^{2}$

The final angular speed is:

$\omega_{2} = \frac{I_{1}}{I_{2}} \cdot \omega_{1}$

$\omega_{2} = \frac{127.525\,kg\cdot m^{2}}{203.929\,kg\cdot m^{2}} \cdot (1.77\,\frac{rad}{s} )$

$\omega_{2} = 1.107\,\frac{rad}{s}$

4 0

3 years ago

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I don't know how to solve this please help

Luden [163]

Energy = mass * SHC * temp change

Temp change = energy/SHC * mass

42kJ - 42000J (convert kJ to J as energy is counted as J/kg)

Temp change = 42000/4200*10
= 1C

So it goes up by 1C thus the final temperature would be 26C

Or a more logical way to think of it would be that if it takes 4200J to heat up 1kg of water by 1C (SHC is 4200J/kgC) it would take ten times the amount of energy to heat up 10kg of water by 1C hence it takes 42000J.

7 0

3 years ago

Can someone help me with this question

77julia77 [94]

I didnt want to type it all so here is the link that tells you all you need to answer that question

https://kids.kiddle.co/Electron_cloud

8 0

3 years ago

The outer layer of the Earth is called the<br> lithosphere or crust?

Annette [7]

The outer layer of the Earth is called <span>crust!</span>

6 0

3 years ago

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Which of the following statements best describes the definition of<br> distance?

ch4aika [34]

Explanation:

The distance covered by a body is equal to the sum of total path covered. It is equal to the total path traveled by an object during its entire journey.

This quantity is always positive. It can't be 0 or a negative number.
It is defined as a scalar quantity.
Mathematically, it can be calculated as follows :

distance = speed × time

5 0

3 years ago