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2 years ago

How do velocities combine

Physics

1 answer:

Anarel [89]2 years ago

8 0

Answer:

They combine if they have the same units

Explanation:

I am not quite sure what you mean by this question. I will try my best to answer this.

Velocities combine only if they both have the same units. The linear velocities have the unit meters per second. For example, a linear velocity and an angular velocity cannot combine together because angular velocity has a unit of radians per second.

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A mole of ideal gas expands at T=27 °C. The pressure changes from 20 atm to 1 atm. What’s the work that the gas has done and wha

Airida [17]

Answer:

The work made by the gas is 7475.69 joules
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Explanation:

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$\Delta W = \int\limits_{s_1}^{s_2}\,dW = \int\limits_{v_1}^{v_2} P \ dv$

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$P = \frac{\ n \ R \ T}{V}$

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$\Delta W = \ n \ R \ T ln(\frac{P_1}{P_2})$

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$E= c_v n R T$

where $c_v$ its the internal energy of the gas. As the temperature its constant, we know that the gas must have the energy is constant.

By the first law of thermodynamics, we know

$\Delta E = \Delta Q - \Delta W$

where $\Delta W$ is the Work made by the gas (please, be careful with this sign convention, its not always the same.)

So:

$\Delta E = 0$

$\Delta Q = \Delta W$

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