Berikut ini adalah pertanyaan dari yoschristian66 pada mata pelajaran Fisika untuk jenjang Sekolah Menengah Pertama
atmospheric pressure is 760 mm Hg, calculate the pressure of the neon gas in cm Hg.
(h = 36 cm)
Jawaban dan Penjelasan
Berikut ini adalah pilihan jawaban terbaik dari pertanyaan diatas.
Jawaban:
(a) For figure (a)
Atmospheric pressure, P0= 76 cm of Hg
Difference between the levels of mercury in the two limbs gives gauge pressure
Hence, gauge pressure is 20 cm of Hg.
Absolute pressure = Atmospheric pressure + Gauge pressure
=76+20=96cm of Hg
For figure (b)
Difference between the levels of mercury in the two limbs =–18cm
Hence, gauge pressure is –18 cm of Hg.
Absolute pressure = Atmospheric pressure + Gauge pressure
=76cm–18cm=58cm
(b) 13.6 cm of water is poured into the right limb of figure (b).
Relative density of mercury = 13.6
Hence, a column of 13.6 cm of water is equivalent to 1 cm of mercury.
Let h be the difference between the levels of mercury in the two limbs.
The pressure in the right limb is given as:
PR= Atmospheric pressure + 1 cm of Hg
=76+1=77cm of Hg ….. (i)
The mercury column will rise in the left limb.
Hence, pressure in the left limb, PL=58+h ..... (ii)
Equating equations (i) and (ii), we get:
77=58+h
∴h=19cm
Hence, the difference between the levels of mercury in the two limbs will be 19 cm.
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Last Update: Tue, 13 Jul 21