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natima [27]
3 years ago
8

A 15.0 kg turntable with a radius of 25 cm is covered with a uniform layer of dry ice that has a mass of 9.0 kg. The angular spe

ed of the turntable and dry ice is initially .75 rad/s, but it increases as the dry ice evaporates. What is the angular speend of the turntable once all the dry ice has evaporated?
Physics
1 answer:
liubo4ka [24]3 years ago
7 0

Answer:

 ω₂=1.20

Explanation:

Given that

mass of the turn table ,M= 15 kg

mass of the ice ,m= 9 kg

radius ,r= 25 cm

Initial angular speed ,ω₁ = 0.75 rad/s

Initial mass moment of inertia

I_1=\dfrac{M+m}{2}r^2

I_1=\dfrac{15+9}{2}\times 0.25^2\ kg.m^2

I_1=0.75\ kg.m^2

Final mass moment of inertia

I_2=\dfrac{M}{2}r^2

I_2=\dfrac{15}{2}\times 0.25^2\ kg.m^2

I_2=0.468\ kg.m^2

Lets take final speed of the turn table after ice evaporated =ω₂ rad/s

Now by conservation angular momentum

I₁ ω₁ =ω₂ I₂

\omega_2=\dfrac{0.75\times 0.75}{0.468}\ rad/s

ω₂=1.20

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#2

As we know that

pressure * area = Force

here we know that

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P = 0.2 atm = 0.2 \times 1.01 \times 10^5 = 2.02\times 10^4 Pa

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As we know that density of water will vary with the height as given below

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Answer:

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Explanation:

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3 years ago
The scientific method is a process by which scientists: prove theories to be known facts gain confidence in theories by failing
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Answer:

The scientific method is the process by which scientists gain confidence in theories by failing to prove them wrong.

Explanation:

Scientific  method is a step by step process of creating and carrying out experiments. These processes to be performed are derived from logical and rational application  of knowledge concerning a particular subject matter. Through these processes, scientists reach a conclusion about the world, these makes them confident in their findings.

The steps involved in scientific method include:

Observation: it is the first step. It enables you organise in your mind how you want the experiment to.

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PREDICTION is how you think about the scientific idea- It solely relies on the hypothesis made.

EXPERIMENT is used to test your hypothesis. It is the tool designed to check if your idea is right or wrong.

CONCLUSION is the final step. It is the result gotten from the experiment. It can approve the hypothesis or reject the hypothesis.

A theory is formed when hypothesis has been tested to be true by many scientists. Hence scientists gain confidence in theories when the scientific method is approved.

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Svetradugi [14.3K]

Answer:

a) C. 7.5 V

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V_{2} = R_{2}\frac{V}{R}\\\\V_{2} = (300\ \Omega)\frac{10\ V}{400\ \Omega}\\\\

V₂ = 7.5 V

Therefore, the correct option is:

<u>C. 7.5 V</u>

<u></u>

b)

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V = V_{1}+V_{2}\\V_{1} = V-V_{2}\\V_{1} = 10\ V - 7.5\ V\\V_{1}=2.5\ V

Therefore,the correct option is:

<u>A. 2.5 V</u>

5 0
2 years ago
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