1.
Aho potlaka ka lebaka la matla a khoheli ke 10 N/kg. Sebaka sa bokaholimo ba tlhapi se hatelitsoeng ke metsi ka holim'a eona ke 6 cm2Fumana matla a metsi a kaholimo ho tlhapi a sebetsang ho tlhapi.
Tse tsejoang:
Ho potlakisa ka baka la matla a khoheli (g) = 10 N/kg
Sebaka sa tlhapi (A) = 6 cm2 = 6x10-4 m2
segokanyipalo ea metsi = 1 gram/cm3 = 1 (10-3 kg) / 10-6 m3 = 103 kg / m3 = 1000 lik'hilograma / m3
Bophahamo ba metsi = 100 cm – 15 cm = 85 cm = 85 x 10-2 limithara tse
Ho batloa: Matla a metsi a ka holim'a tlhapi a sebetsang ho tlhapi
Tharollo:
Tekanyo ea khatello:
P = F / A
F = PA
F = ρ gh A
F = (1000)(10)(85 x 10-2)(6 x 10-4 m2)
F = (10)4)(510 x 10-6)
F = 510 x 10-2
F = 5.1 Newton
2. Khatello e tloaelehileng ea mali ke 80 mm Hg ho isa ho 120 mm Hg. Boleng bona bo lekana le…
A. Pascal 80 ho isa ho 120 Pascal
B. 800 Pascal ho isa ho 1200 Pascal
C. 10256 Pascal ho isa ho 17589 Pascal
D. 10526 Pascal ho isa ho 15789 Pascal
Tse tsejoang:
Khatello e tloaelehileng ea mali = 80 mm Hg – 120 mm Hg
Oa Batla: Boleng bona bo lekana le… Pascal
Tharollo:
Bophahamo ba mercury ka har'a barometer (kaholimo ho bokaholimo ba leoatle) = 760 mm Hg
Khatello ea moea (ka holim'a leoatle) = 1 atm = 1.0 x 105 Pascal
1 mm Hg = ……. Pascal?
80 mm Hg = 80 x 131.58 Lipaseka = 10,526 Lipaseka
120 mm Hg = 120 x 131.58 Lipaseka = 15,789 Lipaseka
Karabo e nepahetseng ke D.
3. Ka holim'a metsi a leoatle, bophahamo ba mercury ho barometer ke 760 mm. Haeba sebakeng se itseng, bophahamo ba mercury ho barometer ke 700 mm. Fumana khatello ea moea sebakeng seo.
Tse tsejoang:
Bophahamo ba mercury ka har'a barometer (kaholimo ho bokaholimo ba leoatle) = 760 mm Hg
Khatello ea moea (ka holim'a leoatle) = 1 atm = 1,013 x 105 Pascal
Oa Batla: Fumana khatello ea moea haeba bophahamo ba mercury e le 700 mm
Tharollo:
760 mm Hg = 1.013 x 105 Pascal
700 mm Hg = ……… Pascal?
