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Pressure Strong
1. Multiple choice
1. All four bowls are filled with water, and a diagram of force indicates the pressure of water on the bowl wall. Generally speaking, the correct one should be ( )
2. (2012·Wuhan Middle School Entrance Examination) In the following four figures, the one that uses relevant components to reduce the pressure is ( )
3. (2013· Nanchong High School Entrance Examination) A closed cup without a drink is first placed on the table (as shown in Figure A), and then placed invertedly on the table (as shown in Figure B). The pressure and pressure of the bottom of the cup when placing the beverage twice are F A, F B, p A, and p B, respectively. The following relationship is correct ( )
A.pApBF AF B
B. pA pB F A F B
C.p A = p B F A = F B
D.p A p B F A F A = F B
D.p A p B F B
4. The following equipment does not use the principle of the communicator. ( )
5. Xiaohua wants to use empty cans to prove the existence of atmospheric pressure. The following operations can achieve the purpose is ( )
A. Use your hand to pinch the empty cans, and the cans become deflated
B. Seal the empty cans and place them in deep water. The cans become deflated
C. Let the empty cans fall from a high place and hit the ground, and the cans become deflated
D. Use a syringe to extract the air in the sealed cans, and the cans become deflated
6. 2013· Linyi High School Entrance Examination) As shown in the figure, Xiaoming used a plastic tube to suck the milk in the box into his mouth. This is because ( )
A. Xiaoming's effect on the attraction of milk
B. The straw itself has the effect of sucking milk
C. The result of atmospheric pressure acting on the milk liquid surface
D. The effect of milk pressure
7. (2013· Huanggang High School Entrance Examination) After learning the "relationship between fluid pressure and flow rate", in order to solve the ventilation problem of the middle aisle of the "H"-shaped underground passage, the students designed the following solutions. As shown in the figure, the black part is the convex part of the wall, "" is the ventilation fan installed on the top of the aisle. Among them, the effective and energy-saving one is ( )
2. Fill in the blanks
8. (2012·Guilin High School Entrance Examination) As shown in the figure, use two index fingers to press both ends of the pencil at the same time. The pressure of the pencil is F1, the pressure of the pencil is p1, and the pressure of the right finger is F2, and the pressure of the pencil is p2. Then F1______F2, p1______p2. (Optional fill in "greater than", "equal to" or "less than")
9. (2013· Yichang High School Entrance Examination) Xiaohua's mass is 50kg, and the contact area between each foot and the ground is 200 cm². The pressure on the horizontal ground when he stands with his feet is _____Pa, and the pressure on the horizontal ground when he walks will be __________ (Optional fill in "grown", "grown smaller" or "unchanged"). (g=10N/kg)
10. (2013· Heze High School Entrance Examination) As shown in the figure, when treating infusion, two plastic tubes A and B are often inserted at the mouth of the potion bottle. The A cannula is an infusion tube. The function of the B cannula is to use _______ to make the liquid flow into the human blood vessels.
11. On May 21, 2012, the first deep-water pipe laying lifting ship in China, "Ocean Oil 201", officially set sail. Since then, my country has the ability to self-explorate and develop deep-water oil and gas resources in the South China Sea. In the development of marine resources, as the seawater increases, the greater the pressure generated by seawater. In the 1500m deep-sea pipe laying operation, the pressure of seawater on the pipeline equipment is _____Pa. (Take ρ sea water = 1.0×10³kg/m³)
12. (2013·Chongqing High School Entrance Examination) Madberg hemisphere experiment proves the existence of _____. In order to remove water from the solution at a temperature not exceeding 80℃ during the pharmaceutical process, the method used is to extract antibiotics by _____ (optionally fill in the air pressure in the container to make the boiling point of water lower than 80℃.
3. Calculation question
13. As shown in the figure, my country's Type 88 main battle tank weighs 40 t and has a height of 2 m. The contact area between each track and the ground is 2 m². The tank has the function of submersible ferrying.
Please answer the following questions:
(1) When the tank is driving on a horizontal road, what is the pressure on the ground?
(2) If the tank is diving in a river with a depth of 5 m, the pressure on the horizontal riverbed is 105N, then what is the volume of the tank?
(3) When the tank is diving in the river, what is the pressure on the water of the hatch door with an area of 0.8 m² on the top of the tank?
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