1.
Acceleration due to gravity is 10 N/kg. The surface area of fish pressed by the water above it is 6 cm2. Determine the force of water above fish that acts on fish.
Bekannt:
Beschleunegung duerch Schwéierkraaft (g) = 10 N/kg
Surface area of fish (A) = 6 cm2 = 6 x 10-4 m2
Dicht of water = 1 gram/cm3 = 1 (10-3 kg) / 10-6 m3 = 103 kg / m3 = 1000 kg/m²3
Height of water = 100 cm – 15 cm = 85 cm = 85 x 10-2 Meter
Gesicht: Force of the water above fish that acts on fish
Léisung:
Equatioun vun Drock:
P = F/A
F = P A
F = ρ g h A
F = (1000)(10)(85 x 10-2)(6 x 10-4 m2)
F = (104)(510 x 10-6)
F = 510 x 10-2
F = 5.1 Newton
2. The normal pressure of blood is 80 mm hg to 120 mm hg. This value is equal to…
A. 80 Pascal to 120 Pascal
B. 800 Pascal to 1200 Pascal
C. 10256 Pascal to 17589 Pascal
D. 10526 Pascal to 15789 Pascal
Bekannt:
The normal pressure of blood = 80 mm Hg – 120 mm Hg
Gewënscht: This value is equal to… Pascal
Léisung:
The height of mercury in a barometer (above the surface of the sea) = 760 mm Hg
Pressure of air (above the surface of sea) = 1 atm = 1.0 x 105 Pascal
1 mm Hg = ……. Pascal?
80 mm Hg = 80 x 131.58 Pascal = 10,526 Pascal
120 mm Hg = 120 x 131.58 Pascal = 15,789 Pascal
Déi richteg Äntwert ass D.
3. Above the surface of the sea, the height of mercury in a barometer is 760 mm. If at a place, the height of mercury in a barometer is 700 mm. Determine the pressure of air at that place.
Bekannt:
The height of mercury in a barometer (above the surface of the sea) = 760 mm Hg
Pressure of air (above the surface of sea) = 1 atm = 1,013 x 105 Pascal
Gewënscht: Determine the pressure of air if the height of mercury is 700 mm
Léisung:
760 mm Hg = 1.013 x 105 Pascal
700 mm Hg = ……… Pascal?
