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The vertical height difference between the inner and outer mercury surfaces of the glass tube is 700mm, and the local atmospheric pressure is () mm mercury column
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Why didn' t Torricelli's experimental atmosphere break the vacuum in the glass tube? Like a question Another 20 points. Didn't the internet say that there were many capable people? Help, wait until the problem is closed. Why didn't Torricelli test the atmospheric pressure to break the vacuum in the glass tube? Such as title Another 20 points, online isn't there a lot of capable people? Please, wait until the problem is closed. Why didn't Torricelli's experimental atmosphere break the vacuum in the glass tube? Like a question Another 20 points, didn't the internet say that there were many capable people? Help, wait until the problem is closed.
The atmospheric pressure was about 100,000 Pa, and the glass tube was only 1,2 square centimeters,
The pressure was only about 0.1 N, how could such a small force break through
The atmospheric pressure is about 100,000 Pa, and the glass tube is 1,2 square centimeters,
Pressure is only about 0.1 N, how can such a small force be broken
The atmospheric pressure is about 100,000 Pa, and the glass tube is 1,2 square centimeters,
The pressure is only about 0.1 N, how can such a small force crush
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- 1. Mr. li was doing a torrecelli experiment to study atmospheric pressure when the glass tube was so thin that it closed off a portion of the air when the mercury was poured. If the mercury column is only 20 cm high, the following statement is true: A. When the glass tube is placed vertically upward, the air pressure enclosed in the tube is equal to the pressure outside B. When the glass tube is placed horizontally, the air pressure enclosed in the tube is equal to the pressure outside C. When the glass nozzle is placed vertically downward (the watermark is not poured out), the air pressure enclosed in the pipe is equal to the atmospheric pressure outside D. Regardless of placement, the closed air pressure inside the tube is equal to the atmospheric pressure outside Please elaborate on why, which is right and why others are wrong Be sure to analyze them one by one
- 2. A rectangular glass container with a bottom surface of 30 cm by 30 cm is filled with water, and a portion of the water is poured into an iron drum with a bottom surface of 10 cm high When the iron drum is filled with water, the water level in the container drops by 20cm. What is the side length of the bottom surface of the iron drum? Write wrong, is to pour part of the water into a square bottom, after the same A rectangular glass container with a bottom surface of 30 cm by 30 cm is filled with water, and a portion of the water is poured into an iron drum with a bottom surface of 10 cm high When the drum is filled with water, the water level in the container drops by 20cm. What is the side length of the bottom of the drum? Write wrong, is to pour part of the water into a square bottom, after the same
- 3. A 30 cm×30 cm rectangular glass container was filled with water. Now, a portion of the water was poured into an iron bucket with a square bottom and a height of 10 cm. When the iron bucket was filled with water, the water in the container dropped by 20 cm. How long was the bottom of the iron bucket? A 30cm×30cm rectangular glass container is filled with water. Now, pour some water into an iron bucket with a square bottom and a height of 10cm. When the iron bucket is filled with water, the water surface in the container drops by 20cm. What is the side length of the bottom of the iron bucket? A 30cm×30cm rectangular glass container is filled with water. Now, pour some water into an iron drum with a square bottom and a height of 10cm. When the iron drum is filled with water, the water surface in the container drops by 20cm. What is the length of the bottom side of the iron drum?
- 4. A 30 cm×30 cm rectangular glass container was filled with water. Now, a portion of the water was poured into an iron bucket with a square bottom and a height of 10 cm. When the iron bucket was filled with water, the water in the container dropped by 20 cm. How long was the bottom of the iron bucket? A 30cm×30cm rectangular glass container is filled with water. Now, pour some water into an iron bucket with a square bottom and a height of 10cm. When the iron bucket is filled with water, the water surface in the container drops by 20cm. What is the side length of the bottom of the iron bucket? A 30cm×30cm rectangular glass container is filled with water. Now, pour some water into an iron drum with a square bottom and a height of 10cm. When the iron drum is filled with water, the water surface in the container drops by 20cm. What is the length of the bottom side of the iron drum?
- 5. A 30 cm×30 cm rectangular glass container was filled with water. Now, a portion of the water was poured into an iron bucket with a square bottom and a height of 10 cm. When the iron bucket was filled with water, the water in the container dropped by 20 cm. How long was the bottom of the iron bucket? A 30cm×30cm rectangular glass container is filled with water. Now, pour some water into an iron bucket with a square bottom and a height of 10cm. When the iron bucket is filled with water, the water surface in the container drops by 20cm. What is the side length of the bottom of the iron bucket? A 30cm×30cm rectangular glass container is filled with water. Now, pour some water into an iron drum with a square bottom and a height of 10cm. When the iron drum is filled with water, the water surface in the container drops by 20cm. What is the length of the bottom side of the iron drum?
- 6. A 30 cm×30 cm rectangular glass container was filled with water. Now, a portion of the water was poured into an iron bucket with a square bottom and a height of 10 cm. When the iron bucket was filled with water, the water in the container dropped by 20 cm. How long was the bottom of the iron bucket? A 30cm×30cm rectangular glass container is filled with water. Now, pour some water into an iron bucket with a square bottom and a height of 10cm. When the iron bucket is filled with water, the water surface in the container drops by 20cm. What is the side length of the bottom of the iron bucket? A 30cm×30cm rectangular glass container is filled with water. Now, pour some water into an iron drum with a square bottom and a height of 10cm. When the iron drum is filled with water, the water surface in the container drops by 20cm. What is the length of the bottom side of the iron drum?
- 7. A rectangular glass body 30 cm x 30 cm bottom filled with water is now poured into a square bottom A rectangular glass body with a bottom surface of 30cm x 30cm is filled with water. Now pour a part into an iron bucket with a square bottom surface and a height of 10cm. When the iron bucket is filled with water, the water surface in the container drops by 20cm. What is the side length of the bottom surface of the iron bucket? A 30 cm x 30 cm rectangular glass body filled with water of 30 cm x 30 cm, a portion is now poured into a square bottom surface A rectangular glass body with a bottom surface of 30cm x 30cm is filled with water. Now pour a part into an iron bucket with a square bottom surface and a height of 10cm. When the iron bucket is filled with water, the water surface in the container drops by 20cm. What is the side length of the bottom surface of the iron bucket?
- 8. The glass tube in the mercury barometer contains not mercury but water. When the atmospheric pressure is 760g, how high is the water The glass tube in the mercury barometer contains not mercury but water. When the barometric pressure is 760g, how high is the water
- 9. 2. Place the mercury tank on the left plate of the balance, fix the glass tube with the support, and put an appropriate amount of weights into the left plate to balance the balance. If the atmospheric pressure increases, the correct value is A. The balance is unbalanced. If the balance is restored, add weights on the right plate. B. The balance is unbalanced. If the balance is restored, the weight shall be subtracted from the right plate. C. Balance still balanced D. Inability to determine Why doesn't the mercury column in the glass tube put pressure on the balance plate 2. Place the mercury tank on the left side of the balance, fix the glass tube with the support, and put an appropriate amount of weights in the left side to balance the balance. If the atmospheric pressure increases, the correct value is A. The balance is unbalanced. If the balance is restored, add a weight on the right plate. B. The balance is unbalanced. If the balance is restored, the weight shall be subtracted from the right plate. C. Balance still balanced D. Inability to judge Why doesn't the mercury column in the glass tube put pressure on the balance plate
- 10. When the atmospheric pressure is low in summer, the professional fish farmers need to add oxygen to the fish pond to prevent the death of fish from hypoxia. Xiao Ming designed an automatic oxygenation system. He modified the mercury barometer in the laboratory. A copper wire is sealed at the left top of the barometer, and a copper wire is fixed at the right opening, as shown in the figure. The mercury surface on the left of the barometer is above the vacuum. When the left mercury surface drops, the right mercury surface will rise. If the external atmospheric pressure is lower than the pressure generated by the 74cm high mercury column, the mercury column will connect the copper wires on both sides, so that the control circuit of the electromagnetic relay will form a path, and the electromagnet will absorb the armature. When the working circuit is connected, the oxygenation pump (AC motor) works automatically. (1) The copper conductor on the right side of the barometer shall be extended vertically downward to the right center of ______cm. Please draw it in the figure at the same time. (2) Please connect the circuit directly in the drawing according to the requirements.
- 11. The sum of the edges of a cuboid is equal to that of a cube. The cuboid is known to be 8 cm long and 5 cm wide, and its volume is cubic
- 12. When a cuboid of 100 decimetres is cut off from a cuboid, the remaining part is exactly a 5 minute square with the original cuboid What is the square decimeter of the surface area of (continued ↑)
- 13. A square prism is 2 decimeter long, pour 5 decimeters of water, and then put 8 centimeters of rectangular iron block in the water. At this time, the water depth is 15 centimeters, and the bottom area of iron block is determined. A square prism is 2 decimeter long, pour 5 decimeters of water, and then put 8 centimeters of rectangular iron block in the water. At this time, the water depth is 15 centimeters, so as to find the area of iron block bottom.
- 14. A rectangular container with a prism 8 cm in length was filled with water, which was poured into a rectangular container 16 cm long,8 cm wide and 7 cm high. How many centimeters is the water surface from the cuboid container?
- 15. When two cubes with 3 dm edges are combined into a cuboid, the surface area is () and the volume is () When two squares of 3 dm in length are combined into a box, its surface area is () and its volume is ()
- 16. The sum of the edges of a cuboid is 48 dm, the cuboid is known to be 8 dm long and 3 dm wide. The sum of the edges of a cuboid is 48 dm, and the cuboid is known to be 8 dm long and 3 dm wide.
- 17. When the height of a rectangle is increased by 3 dm, it becomes a cube. The surface area of this cube is increased by 48 dm2 compared with that of the original cube. Formula ~
- 18. A cuboid wood (as shown in the figure), after cutting a cuboid with a volume of 72 decimeters, the remaining part is exactly a cuboid with a prism length of 3 decimeters. Find the surface area of the original cuboid.
- 19. By reducing the height of the cuboid by 4 decimetres, it becomes a cuboid and its surface area is reduced by 80 square metres. The cuboid was originally () cubic metres
- 20. A cuboid is cut into two identical cubes, increasing the surface area by 18 cm2, which is () cm2