V.7. Recapitulative exercises - Pressure.
🔐 Recapitulative exercises - Pressure.
1. Complete the following statements.
a) The pressure is a physical parameter equal to the ratio between the pressing force and …………… the surface on which the pressing force is distributed.
b) Atmospheric pressure is the pressure ……………………… due ………………………
c) The static pressure inside a liquid is called the ……………………………… pressure, being due to ……………………………… the liquid.
d) In two or more communicating vessels the liquid rises to …………………………………….
e) The external pressure exerted on a fluid is transmitted throughout the whole …………………………………… fluid.
f) On a body immersed in a fluid, a force is exerted on the …………………………………… direction oriented ………………, called the force …………, equal to …………… the volume of fluid displaced by the body.
2. Recognizes what the following applications are based on:
a) Densimeter
b) Level indicator of a water (oil) tank
c) Car foot brake
d) Thinner footprints on snow with skis than those left with boots
e) Hot air balloons
f) Vacuum pump
g) Car lift
h) The altimeter
i) The sprinkler
j) The dental chair
k) The submarine
3. Complete the following statements regarding the archimedical force, FA:
a) It has …………………… direction, oriented …………………… and the point of application in the weight center of the …………………… liquid volume.
b) Equal in module with displaced fluid ………………………….
c) …… depends on the weight and shape of the body, the depth of immersion, the height of the liquid in the vessel.
d) Its value depends on the ……………………… of the liquid in which we immerse the body and ……………… of the body.
4. What are the two factors on which atmospheric pressure depends?
5. Draw a hydraulic press and name its components.
6. How did Torricelli measure atmospheric pressure?
7. The pressure exerted on an area of 1 m2 is 10 Pa. What is the angle that the direction of the force makes with the normal to the respective surface, knowing that the pressing force is 20 N?
8. A steel cylinder of 400 cm3, with a density of 7800 kg/m3 has a diameter of 5 cm. What pressure does it exert on a surface?
9. Glycerin with a density of 1260 kg/m3 is poured into a U tube and then water, with a density of 1000 kg/m3 is added. The glycerin column is 15 cm long. How much is the difference between the two liquids in the branches of the tube?
10. The diameters of the pistons of a hydraulic press are 20 mm and 8 cm, respectively. A force of 40 N is exerted on the small piston, with a stroke of 30 cm. Find out the force that lifts the big piston and its stroke.
11. A 60 g egg with a volume of 60 cm3 is placed in a brine (salt solution). The sunken volume of the egg is 50 cm3. What is the density of brine?
12. A wooden cube with a side of 4 cm and a density of 600 kg/m3 is placed in water, which has a density of 1000 kg/m3. Find out:
a) The value of the Archimedean force.
b) The value of the resulting force acting on the body in water. What is this force called?
c) What is the height of the portion of the cube that is under water?
13. How tall should Torricelli's tube be if we used oil with a density of 800 kg/m3 instead of mercury, knowing the normal atmospheric pressure of 100.000 Pa?