7) Straws work on the principle of the outside atmospheric pressure pushing the

Question

7) Straws work on the principle of the outside atmospheric pressure pushing the fluid (for example water) up the straw afteir you have lowered the pressure at the top of the straw (in your mouth). Assuming you could create a perfect vacuum in your mouth, what is the longest vertical straw you could drink water from'? 1.65 m 4.28 m 7.71 m 10.3 m 8) How would this answer change if you were on a planet with a much lower atmospheric pressure? increases decrease:s remains the same 9) A block of wood (density 550 kg/m3) and a block of metal (density 2700 kg/m3) with equal volume are placed 1 m under water in a swimming po ol. Which has a greater buoyant force on it? the metal the wood they have the same buoyant force 10) Which has a greater force of gravity on it? the metal the wood they have the same force of gravity 11) Compare the buoyant force to the force of gravity for cach object. In both cases the buoyant force is greater oth cases the force of gravity is greater. For the metal, the buoyant force is greater; for the wood, the force of gravity is greater. For the wood, the buoyant force is greater; for the metal, the force of gravity is greater.

Explanation / Answer

(7) We have to create vaccum in our mouth equal to the atmospheric pressure = 10.3 m
Since the specific gravity of water is 1 therfore the length required will be = 10.3 m
hence the correct option is D.
(8) If atmospheric pressure is lower then we have to create less vaccum hence the length will decrease.
therefore the correct option is B that is decreases.
(9) Buoyant force is given by = pwgV
where pw is density of water
V is volume of block
Since the volume is same for both block therefore the buoyant force on both block will be same.
hence the correct option is they have same buoyant force.
(10) Since the density of the metal block is more therfore its mass will be more.
hence the gravity force will be more on metal block.
(11) Since both block is not sinked therefore the buoyant force will be greater for both object.
(12) Since buoyant force is independent of depth therfore it will remain same.
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