"Comprehensive calculation and judgment about pressure and buoyancy" Buoyancy PPT

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"Comprehensive calculation and judgment about pressure and buoyancy" Buoyancy PPT

1. The "Type 094" submarine is a new generation of submarine independently developed by our country. When it rises from the deep sea without emerging from the water, it is subjected to ( )

A. The pressure decreases, but the buoyancy remains the same

B． Pressure decreases and buoyancy increases

C． pressure decreases, buoyancy decreases

D. As pressure increases, buoyancy remains unchanged

2. Two identical cups A and B contain salt water with different densities and volumes. The same small ball is placed into the cups one after another. When the ball is stationary in the salt water, the liquid levels in the two cups are equal, as shown in Figure 6 -ZT-1 shown. but( )

A． The buoyant force on the ball in cup A of salt water is greater than the buoyant force on the ball in cup B.

B． The buoyant force on the ball in cup A of salt water is less than the buoyant force on the ball in cup B.

C． The density of the salt water in cup A is greater than the density of the salt water in cup B

D. The pressure of salt water on the bottom of cup A is less than the pressure on the bottom of cup B

3． (Multiple choices) As shown in Figure 6-ZT-2A, a rectangular metal block is hung with a spring dynamometer and gradually immersed in water. Figure B shows the indication F of the spring dynamometer during this process as the lower surface of the metal block is immersed in the water. The change of depth h, g is taken as 10 N/kg. but( )

A． The mass of the metal block is 0.4 kg

B． The maximum buoyant force on the metal block is 2 N

C． During the AB process, the buoyancy force on the metal block gradually decreases.

D. During the AC process, the maximum upward pressure exerted by water on the bottom of the metal block is 800 Pa.

4． Xiaohua found a toothpaste with a mass of 140 g and a volume of 1.8×10-4 m3. When he immersed it in the water in the glass with his hand, the buoyancy force on the toothpaste was _____N. After letting go, the toothpaste will ______(select Fill in "floating", "sinking" or "suspended"). After it comes to rest, the pressure on the bottom of the cup will be ______ (choose "unchanged", "increased" or "decreased") compared to when it was immersed. (g is taken as 10 N/kg)

5. Figure 6-ZT-3 shows a certain type of submarine with a volume of 5×103 m3. Find: (The density of seawater is approximately 1.0×103 kg/m3, and g is 10 N/kg)

(1) The buoyancy force it experiences when diving underwater to perform tasks.

(2) When it dives to 200 m underwater, the hatch cover with an area of ​​1.2 m2 is subject to the pressure and pressure of the sea water.

6． A cube object weighs 10 N and has a volume of 1×10-3 m3. It is suspended by a string and immersed in the liquid in a thin-walled cylindrical container. The tension of the string is 2 N, as shown in Figure 6-ZT-4. , it is known that the bottom area of ​​the container is 100 cm2, and g is 10 N/kg. beg:

(1) The buoyancy force exerted on the object.

(2)The density of the object.

(3) After the object is placed, the pressure increased by the liquid on the bottom of the container.

Keywords: Free download of PPT courseware for the second volume of eighth-grade physics published by the People's Education Press, download of PPT on comprehensive calculation and judgment of pressure and buoyancy, download of buoyancy PPT, .PPT format;

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Update Time: 2024-07-06

This template belongs to Physics courseware People's Education Edition Physics for Grade 8, Volume 2 industry PPT template

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