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UkoKoshka [18]
4 years ago
13

Suppose a balloons was laying by the window at night. The next day, when the sun came up, it warmed the gas (air) that was in th

e balloon. What would be true about the density of the air in the balloon?
Physics
1 answer:
Nonamiya [84]4 years ago
7 0

Answer:

Negligible change.

Explanation:

  • The gas in the balloon after getting exposed to the sunlight experiences a rise in heat of both the balloon and the air.
  • Independently, air on being heated it expands and the volume increases and hence its density would reduce.
  • Contrarily, when the rubber balloon is heated independently it would shrink on heating because its bods get stronger hence the chain of molecules shrink.
  • Therefore we will have a combined effect of the both the matters due to increased heat and hence will nearly nullify each other and hence there will be negligible change in the density of the gas in the balloon because the volume of balloon tries to shrink on being heated.
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An ice skater spinning with outstretched arms has an angular speed of 5.0 rad/s . She tucks in her arms, decreasing her moment o
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Answer:

  K_{f} / K₀ =1.12

Explanation:

This problem must work using the conservation of angular momentum (L), so that the moment is conserved in the system all the forces must be internal and therefore the torque is internal and the moment is conserved.

Initial moment. With arms outstretched

         L₀ = I₀ w₀

the wo value is 5.0 rad / s

final moment. After he shrugs his arms

         L_{f} = I_{f}  w_{f}

indicate that the moment of inertia decreases by 11%

        I_{f} = I₀ - 0.11 I₀ = 0.89 I₀

        L_{f} = L₀

        I_{f} w_{f}  = I₀ w₀

        w_{f} = I₀ /I_{f}    w₀

let's calculate

        w_{f} = I₀ / 0.89 I₀   5.0

        w_{f} = 5.62 rad / s

Having these values ​​we can calculate the change in kinetic energy

         K_{f} / K₀ = ½ I_{f} w_{f}² (½ I₀ w₀²)

         K_{f} / K₀ = 0.89 I₀ / I₀ (5.62 / 5)²

         K_{f} / K₀ =1.12

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Explanation:

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3 years ago
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Which circuit is a series circuit
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The answer is A

Explanation:

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Refer below.

Explanation:

Refer to the picture for brief explanation.

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