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4 years ago

8 Grade Science Explain how a Lava lamp demonstrates convection currents.

Physics

1 answer:

Greeley [361]4 years ago

5 0

Answer:

As a substance gains heat energy (in the case of the lava lamp, heat is transferred from the hot light bulb to the lava), it becomes less dense than the surrounding liquid ), causing the substance to rise.

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Yuliya22 [10]

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Given the following data:

Internal energy = 123 Joules

Work done = 165 Joules

To calculate the total amount of energy transferred as heat, we would apply the first law of thermodynamics.

<h3>The first law of thermodynamics.</h3>

Mathematically, the first law of thermodynamics is given by the formula:

$\Delta E = Q - W$

Where;

$\Delta E$ is the change in internal energy.

Q is the quantity of heat transferred.

W is the work done.

Substituting the given parameters into the formula, we have;

$123 = Q - 165\\\\Q=123+165$

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3 years ago

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4 years ago

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The maximum allowable potential difference across a 250 mH inductor is 360 V . You need to raise the current through the inducto

andrezito [222]

This question involves the concepts of potential difference, inductance, and current.

The minimum time that should be allowed for the current to change is "0.694 ms".

The inductance of an inductor is given by the following formula:

$E=L\frac{\Delta I}{\Delta t}\\$

where,

E = potential difference across the inductor = 360 volts

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Therefore,

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3 years ago

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4 years ago

8 Grade Science Explain how a Lava lamp demonstrates convection currents. ​

8 Grade Science Explain how a Lava lamp demonstrates convection currents.