the assignment says this guy has has noticed that the bowling ball was heavier than the glass marble in his pocket so he concluded that the bowling ball had to have more density. but when he went home and out the two items in the tub, the bowling ball floated, the glass marble sunk? why is that? are there two real life examples like this? I know the heaviness does not relate to the density. . .
need 2 real life example’s. . . . look above
Can someone please explain how the density of a bowling ball and glass marble are different?
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The bowling ball contains molecules of air – at the time the rock was formed – there was air in the atmosphere, the air trapped in the Bowling ball causes it to float. The Glass marble may have some air bubbles but they are not sufficient to cause the float effect.
Bowling balls vary in weight, but all are the same size (circumference 27 inches). Therefore, they vary in density. Balls under 10 pounds will float in water, while those above will sink. The maximum allowable weight is 16lb.
High-performance bowling balls have filler material between the core and the coverstock (surface) to vary weight. Most are at least 12 (or even 14) pounds because they have very dense cores which take up most of the weight limit, whereas beginners balls and spare balls have much more variation in weight (usually 6 to 16lb).
Next time you go bowling, see for yourself the difference in feeling between holding a 6lb ball and a 16lb ball.
Glass marbles don’t vary much in weight and density, as far as I know, and they will always sink in water. Not sure what its density is, but a quick search suggests around 2.5g/cm^3 (2.5 times the density of pure water).