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"High School Entrance Examination Real Questions Link" Pressure PPT
►Type 1 Pressure
1．2018·Deyang There are many applications of physical knowledge in production and life. Which of the following statements is correct ( )
A． The purpose of making the schoolbag straps flat and wide is to reduce the pressure of the schoolbag on the human body.
B. Skis generally have a larger area to increase pressure
C． If the kitchen knife is dull, sharpen it to reduce the pressure.
D． Sleepers are laid under the rails to reduce the pressure on the ground.
2.2018·Changde Among the four animal organs shown in Figure 9-T-8, the one with the function of reducing pressure is ()
3.2018·Hainan As shown in Figure 9-T-9, the cube, cuboid and cylinder placed on the horizontal ground are all solid objects made of iron. Their height gradually increases from left to right, and their impact on the ground The pressures are p1, p2 and p3 respectively, then which of the following relationships is correct ( )
A． p1＝p2＝p3
B. p1＜p2＜p3
C． p1>p2>p3
D． Lack of conditions, unable to judge
4. 2018·Hengyang In order to promote green travel, Hengyang City has launched a large number of shared bicycles. Xiao Ming rode 900 m at a constant speed on a level road. The time it took was 3 minutes. The total mass of people and vehicles was about 60 kg. Each wheel and the ground The contact area is approximately 0.01 m2. Find: (g takes 10 N/kg)
(1) What is the speed of the bicycle in meters per second?
(2) The pressure of the bicycle on the ground.
(3) The pressure of the bicycle on the ground at this time.
►Type 2 Liquid Pressure
5．2018·Shaoyang As shown in Figure 9-T-11, two liquids A and B of equal mass were injected into two identical test tubes. It was found that the liquid levels were on the same horizontal line. Compare the effects of liquids A and B on the test tubes. Pressure at the bottom ( )
A． A major B. B University
C． Same size D. unconfirmed
6．2018·Shanghai Which of the following is a connector ( )
A． Liquid level gauge b. thermometer
C． stapler d. pump
7.2018·Yichang my country's "Jiaolong" manned submersible has completed a 7 km level diving test. The pressure it experienced when it dived to a depth of 7 km under the sea surface was ________Pa (ρ seawater = 1.03×103 kg/m3, g is 10 N/kg), in the process of gradually rising back to the sea surface, the seawater pressure it receives will _____ (choose "increase", "unchange" or "get smaller").
8.2018·Nanchong As shown in Figure 9-T-12, in the experiment of "Studying the Effect of Internal Pressure on Liquids":
(1) The pressure gauge displays the pressure on the rubber membrane by observing the _______ of the liquid levels on both sides of the U-shaped tube.
(2) Comparing Figure A and Figure B, we can initially draw the conclusion: In the same liquid, the internal pressure of the liquid increases with the increase of liquid _____.
(3) If we want to discuss whether the internal pressure of a liquid is related to the density of the liquid, we should choose the graph ________ for comparison.
(4) It is known that the height of the liquid column on the left side of the U-shaped tube in Figure B is 4 cm and the height of the liquid column on the right side is 10 cm. Then the pressure of the liquid at the bottom of the U-shaped tube is _____Pa. (ρwater=1.0×103 kg/m3, g is 10 N/kg)
9. 2018·Chifeng Adaptation As shown in Figure 9-T-13, it is the "Jiaolong" manned submersible independently developed by my country. In 2012, the "Jiaolong" submersible successfully completed the 7 km level diving test. (The density of seawater ρ=1.0×103 kg/m3, g is 10 N/kg)
(1) Find the pressure of sea water at a depth of 7 km.
(2) Imagine that you are in the "Jiaolong" submersible at a depth of 7 km
Stretch a hand into the water outside. If the area of the back of the hand is
6×10-3m2, what is the pressure of sea water on the back of the hand?
►Type 3 Atmospheric pressure
10．2018·Qingdao Among the following experiments, the one that can prove the existence of atmospheric pressure is ( )
11．2018·Yantai Figure 9-T-15 shows an automatic water supply device designed by Xiao Ming for the bonsai at home. He filled a plastic bottle with water and placed it upside down in the bonsai. The mouth of the bottle was just submerged in water. In this way, the bonsai The water level in can be maintained at a certain height. The reason why all the water in the plastic bottle will not drain out immediately is ()
A． affected by buoyancy
B. The effect of external atmospheric pressure
C． The role of bonsai plate support
D． The mouth of the bottle is too small, making it difficult for water to flow out
►Type 4: Relationship between fluid pressure and flow rate
12．2017·Yibin As shown in Figure 9-T-16, which phenomenon has nothing to do with the law of "the relationship between fluid pressure and flow velocity" ( )
13．2018·Dongying As shown in Figure 9-T-17, the upper surface of the wing of a certain model aircraft model is convex and the lower surface is relatively flat. During flight, due to the air velocity on the upper surface ____ (optional "big" or "small") and pressure ____ (optional "large" or "small"), upward lift can be obtained.
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