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janayshas84

janayshas84

06.11.2020 •

Physics

Which statement about a plate sitting on a table is true?

Which statement about a plate sitting on a table is true?

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Ответ:

lailalorinda

06.12.2020

A or D but i would put D

Explanation:

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Ответ:

shiba8667

10.09.2020

0.0704 kg

Explanation:

Given

initial Absolute pressure (P_1) =210+101.325=311.325

$T_1=25^{\circ}\approx 298 K$

V=0.025 m^3

$T_2=50^{\circ}\approx 323 K$

as the volume remains constant therefore

$\frac{P_1}{T_1}=\frac{P_2}{T_2}$

$\frac{311.325}{298}=\frac{P_2}{323}$

P_2=337.44 KPa

therefore Gauge pressure is 337.44-101.325=236.117 KPa

Initial mass $m_1=\frac{P_1V}{RT_1}=\frac{311.325\times 0.025}{0.0287\times 298}$

m_1=0.91 kg

Final mass $m_2=\frac{P_2V}{RT_2}=\frac{311.325\times 0.025}{0.0287\times 323}$

m_2=0.839

Therefore m_1-m_2 =0.91-0.839=0.0704 kg of air needs to be removed to get initial pressure back

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