There is a cubic wood block with density of 0.6 times 10 cubic / m3 and side length of 10cm immersed in water. If the pull force on the wood block is 39.2n, there are three methods to calculate the buoyancy Ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah

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1. When a solid iron ball is put into water, the buoyancy is F1. When it is put into mercury, the buoyancy is F2. The known iron density is 7.8, and the mercury density is 13.6, then calculate F1: F2—— thirty-nine But I figured it out to be 1:13.6
2. An iron ball with a volume of 10cm * 3 is put into mercury. How buoyant is it at rest? Density: iron 7.9g/cm * 3, mercury 13.6g/cm * 3
3. When a metal ball is immersed in water, its buoyancy is 4N. When it is immersed in kerosene, its buoyancy is ()? 2. Hang an aluminum block under the spring dynamometer, and the indication of the dynamometer is 5N. Immerse half of the aluminum block in water, and the indication of the spring dynamometer is 4N. When the aluminum block is immersed in water, the indication of the spring dynamometer is (), and the buoyancy of the aluminum block is ()?
4. When a metal ball weighs 5 N is immersed in water and displaces 3 N of water, the buoyancy received by the metal ball is? If it is placed in alcohol, the buoyancy received by the metal ball at rest is? If it is placed in mercury, the buoyancy received by the metal ball at rest? (the density of alcohol is 0.8 × 10 cubic kg / m3, and the density of mercury is 13.6 × 10 cubic kg / m3, see before)
5. Immerse a metal ball in water, the buoyancy it receives is 4N, what is the volume of the metal ball in cubic meters
6. Put a solid metal ball into the mercury, and the metal ball floats on the mercury surface. At this time, the buoyancy of the metal ball is 19.6n. If the metal ball is immersed in water, the indication of the spring dynamometer is 17.5n, and the known metal density is 8 times 10 to the third power kg / cm3 The gravity of a metal ball 2 mass and volume of metal ball Buoyancy of metal ball in water I only have five hours, I'm almost crying
7. At present, there are 10 kg of mercury in 200 ml bottles. How many bottles do you need? (P) mercury = 13.6 * 10 ^ 3kg / m ^ 3
8. There are 10 kg of mercury. If you use a 0.2 liter bottle, how many bottles do you need? The density of mercury is the third power of 13.6 * 10, the third power of kg / m
9. At present, there is 13.6kg of mercury. If a bottle with a volume of 0.2L is used, several bottles (P (instead of the symbol of density) of mercury = 13.6 ×
10. How many bottles do you need to fill 5 kg of mercury in 0.2 liter bottles
11. A square wood block with density of 0.6 times 10 cubic kilogram per cubic meter and side length of 10 cm, which is still on the water surface to calculate gravity and buoyancy
12. Why is mercury so dense?
13. Mercury density
14. The density of water is 1.0 × 10 ~ (- 179); kg / M ~ (- 179;), which is equal to 1.0 × 10 ~ (- 179); kg / M ~ (- 179;)______ G / cm & #, its physical meaning is________ .
15. The density of iron is () g / cm & # 179;, equivalent to () kg / M & # 179;, which means ()
16. The density of water is kg / m ^ 3, or g / cm ^ 3
17. The density of water is 1.0 × 10 & sup3; kg / M & sup3;, and the density of mercury is 13.6 g / cm & sup3;, \("▔□▔)/
18. The density of mercury is 13.6 * 10 ^ 3kg / m ^ 3, the volume is 200cm ^ 3, what is the mass of mercury?
19. The laboratory bought back 8kg of mercury with a density of 13.6 * 10 ^ 3kg / m ^ 3 If 0.2 decimeter ^ 3 bottles are used, how many bottles are needed at least?
20. How many grams of water can a 800 gram alcohol bottle hold? (alcohol density is 0.8 × 01 cubic kg / m3) There is a copper ball with a mass of 800 grams and a volume of 10 cubic centimeters. Can you tell if this copper ball is pure copper? (copper density is 8.9 × 10 cubic kg / m3)