http://www.neonlightssigns.info/stationary-bottle-opener/
Stationary Bottle Opener
Physics help please!!!?
I have no clue, Im really bad at physics and my prelim is in 2 days!
am i just using F=ma
and using
a = -9.8 ?
i have no clue, please help and please explain in terms that i'll be able to understand, i'm 17 not 70 
thanks
A toy diving bell consists of an inverted glass bulb open at one end. The bulb contains a fixed mass of air trapped by water, The diving bell floats below the surface of the water in a sealed plastic bottle.
the bottle is flexible and can be squeezed.
The diving bell has a MASS OF 2.5x10^-3 KG
calculate the size of the upthrust acting on the bell when it is stationary.
Okay - this is an easy one.
You say the bell is stationary so the forces must be balanced (Newton's 1st law)
Upthrust= - Weight
Upthrust = - mg
Upthrust = - (2.5 x 10^-3 x (-9.8)) = 0.0245N Upwards
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