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Readme [11.4K]
2 years ago
14

Two blocks with different temperatures had entropies of 10 J/K and 30 J/K before they were brought in contact. What can you say

about the entropy of the combined system after the two came in contact with each other?a.Ssystem > 40 J/Kb.Ssystem = 20 J/K c.Ssystem < 20 J/Kd.Ssystem > 20 J/Ke.Ssystem = 40 J/Kf.Ssystem < 40 J/K
Physics
1 answer:
True [87]2 years ago
6 0

Answer:

a. Ssystem  > 40 J/K

Explanation:

Given that

The entropy of first block = 10 J/K

The entropy of second block = 30 J/K

When two bodies come into contact with each other, the entropy of the combined system will increase and the entropy sum remains unchanged: According to the Second law of thermodynamics.The entropy of the system will be greater than 40  J/K.

Therefore the answer is a.

Ssystem  > 40 J/K

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A 103 kg horizontal platform is a uniform disk of radius 1.71 m and can rotate about the vertical axis through its center. A 68.
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Answer:

I_{total}=220.64 kg*m^{2}

Explanation:

The moment of inertia of the system is equal to the each population and the platform inertia so

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I_{disk}=\frac{1}{2}*m_{disk}*(r_{p})^{2}

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I_{p}=\frac{1}{2}*m_{p}*(r_{p})^{2}

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The Inertia of the system is the sum of each mass taking into account that all exert the force of inertia:

I_{total}=I_{disk}+I_{p}+I_{d}

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I_{total}=220.64 kg*m^{2}

5 0
3 years ago
A machine that operates a ride at the fair requires 2500 J to lift a 294 N child 5.0 m. What is the efficiency of this machine?
NeX [460]

Answer:

η = 58.8%

Explanation:

Work is defined as the force applied by the distance traveled by the body.

W =F*d

where:

W = work [J] (units of joules)

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d = distance = 5 [m]

W = 294*5\\W = 1470 [J]\\

Efficiency is defined as the energy required to perform an activity in relation to the energy actually added to perform some activity. This can be better understood by means of the following equation.

efficiency = W_{done}/W_{required}\\efficiency = 1470/2500\\efficiency = 0.588 = 58.8%

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Answer:

The definition of acceleration is a change in the rate of motion, speed or action.

<h2>hope it helps.</h2><h2>stay safe healthy and happy..</h2>

4 0
2 years ago
Read 2 more answers
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