1.
Kuthamanga chifukwa cha mphamvu yokoka ndi 10 N/kg. Malo a pamwamba pa nsomba omwe amakanikizidwa ndi madzi pamwamba pake ndi 6 cm 2. Dziwani mphamvu ya madzi pamwamba pa nsomba yomwe imagwira ntchito pa nsomba.
Zodziwika:
Kuthamanga chifukwa cha mphamvu yokoka (g) = 10 N/kg
Malo ozungulira nsomba (A) = 6 cm 2 = 6 x 10 -4 m 2
Kuchuluka kwa madzi = 1 gramu/cm 3 = 1 (10 -3 kg) / 10 -6 m 3 = 10 3 kg/m 3 = 1000 kg/m 3
Kutalika kwa madzi = 100 cm – 15 cm = 85 cm = 85 x 10 -2 mamita
Kufunidwa: Mphamvu ya madzi pamwamba pa nsomba yomwe imagwira ntchito pa nsomba
Yankho:
Kuyerekeza kwa kuthamanga :
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. Kuthamanga kwa magazi kwabwinobwino ndi 80 mm Hg mpaka 120 mm Hg. Mtengo uwu ndi wofanana ndi…
A. Pascal 80 mpaka Pascal 120
B. 800 Pascal mpaka 1200 Pascal
C. 10256 Pascal mpaka 17589 Pascal
D. 10526 Pascal mpaka 15789 Pascal
Zodziwika:
Kuthamanga kwa magazi kwabwinobwino = 80 mm Hg – 120 mm Hg
Akufuna: Mtengo uwu ndi wofanana ndi… Pascal
Yankho:
Kutalika kwa mercury mu barometer (pamwamba pa nyanja) = 760 mm Hg
Kupanikizika kwa mpweya (pamwamba pa nyanja) = 1 atm = 1.0 x 10 5 Pascals
1 mm Hg = ……. Pascal?
80 mm Hg = 80 x 131.58 Ma Pascal = 10,526 Ma Pascal
120 mm Hg = 120 x 131.58 Ma Pascal = 15,789 Ma Pascal
Yankho lolondola ndi D.
3. Pamwamba pa nyanja, kutalika kwa mercury mu barometer ndi 760 mm. Ngati pamalo ena, kutalika kwa mercury mu barometer ndi 700 mm. Dziwani kuthamanga kwa mpweya pamalopo.
Zodziwika:
Kutalika kwa mercury mu barometer (pamwamba pa nyanja) = 760 mm Hg
Kupanikizika kwa mpweya (pamwamba pa nyanja) = 1 atm = 1,013 x 10 5 Pascals
Kufunidwa: Dziwani kuthamanga kwa mpweya ngati kutalika kwa mercury ndi 700 mm
Yankho:
760 mm Hg = 1.013 x 10 5 Pascals
700 mm Hg = ……… Pascal?
