A student has a toy called a 'cartesian diver' inside a sealed plastic bottle of water. The cartesian diver consists of a tube closed at one end. Air is trapped by water inside the tube, as shown. The student squeezes the bottle. More water is forced into the tube, and the volume of the trapped air decreases. Explain why the cartesian diver accelerates downwards. .............................................................................................................................................................................................................................................. .............................................................................................................................................................................................................................................. .............................................................................................................................................................................................................................................. .............................................................................................................................................................................................................................................. .............................................................................................................................................................................................................................................. ..............................................................................................................................................................................................................................................
Exam No：wph11-01-que-20240112 Year：2024 Question No：13
Answer:
(As the volume of the air bubble decreases) the upthrust (of the bubble) decreases
Or
(As water enters the diver) the weight (of the tube, air bubble and water inside) increases.
(So) weight is greater than upthrust.
(So) there is a resultant force downwards.
If no other mark scored, allow one mark for the density of the diver becomes greater than the density of water.
Or
(As water enters the diver) the weight (of the tube, air bubble and water inside) increases.
(So) weight is greater than upthrust.
(So) there is a resultant force downwards.
If no other mark scored, allow one mark for the density of the diver becomes greater than the density of water.
Knowledge points:
CH1 - Mechanics
Solution:
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