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"Test in this Chapter" Buoyancy PPT
1. (Heze High School Entrance Examination) At 7 o'clock in the morning on May 13, 2018, China's first domestically produced aircraft carrier left the dock for sea trials. If the volume of seawater displaced by the aircraft carrier is 7×104 m3 (ρseawater=1.03×103 kg/ m3,g=10 N/kg), the buoyancy force it experiences is 7.21×108 N.
2. (Panzhihua High School Entrance Examination) Gently place an alloy block into an overflow cup filled with water. When it is still, 72 g of water overflows. Take it out, wipe it dry, and then gently place it into an overflow cup filled with alcohol. , when 64 g of alcohol overflows after it is stationary, the buoyancy force on the alloy block in the alcohol is 0.64 N, and the density of the alloy block is 0.9×103 kg/m3 (ρalcohol=0.8×103 kg/m3, g=10 N/kg).
3. (Harbin High School Entrance Examination) In the summer, if you put the watermelon in cold water to cool down, and let go after the watermelon is immersed in the water, the watermelon will float because the buoyancy force on the watermelon is greater than gravity; in the process of fishing out the watermelon with your hands, it becomes more and more laborious. , it can be guessed that the size of the buoyancy force is related to the volume of liquid displaced by the object.
4. (Neijiang High School Entrance Examination) Regarding the buoyancy force on an object, which of the following statements is correct (C)
A. The greater the density of an object, the greater the buoyancy force it experiences.
B. The deeper the object is submerged in the water, the greater the buoyancy force it receives.
C. The larger the volume of water displaced by an object, the greater the buoyant force it receives.
D. Objects floating on the water experience a greater buoyant force than objects sinking at the bottom.
5. (Guilin High School Entrance Examination) Xiaoguan and his classmates went to visit Guilin’s two rivers and four lakes. After boarding the cruise ship, the ship will sink a little, then (C)
A. The ship's gravity will decrease
B. The buoyancy of the water on the ship will decrease
C. The buoyancy of water on the ship will increase
D. The buoyancy of the water on the ship will remain unchanged
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