A wedding reception bartender is faced with a problem: how many litres of fruit juice must be mixed with 4 litres of 24% flavoured rum to make a sum punch 8% strength?
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This force is called buoyant force. The buoyant force pushes upwards against the object. Gravity exerts a downward force on the object (its weight), which is determined by the object's mass. So if the force exerted downward on the object by gravity is less than the buoyant force, the object will float.
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