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Timestampyour name?your emailID?Type your research question in the format : How does 'Y' depend on 'X', where Y is a dependent variable which changes if the independent variable 'X' is changed by us.Select the subject to which your research question belongs.
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6/17/2016 9:27:28Gyanigyani@freegyan.orgFill a rubber balloon with water. The balloon should have a hole, which can be taped from the outside initially. The position of the hole in the balloon can be varied. The size of the hole can be varied. The initial volume of balloon (and water) can be varied. The balloon can be hung in air, or immersed in a liquid of different densities. How does the water flow rate (ml/s) of the liquid leaking from the balloon through the hole, vary with time? The liquid inside the balloon can also be varied. I got this idea while (don't laugh! ) peeing. We would expect that the water flow rate should be maximum initially and then slow down as the balloon empties. But I predict that if the balloon is filled to maximum capacity just below bursting point, the volume flow rate will first be very slow, and then gradually increase till it reaches a maximum and then decrease as the balloon becomes empty. This is what I found by experience when I started to pee with my bladder very full (at bursting point). It takes a few seconds for the flow rate to pick up speed when we start urinating after holding back for too long. (Again, don't laugh! This is science!) The challenge is to predict the experimentally obtained graph, by deriving an expression from first principles. I expect that the elastic force of stretched rubber of the balloon exerts pressure and hence force on the water contained inside the balloon, causing it to come out with a certain flow rate. If the balloon is stretched beyond its elastic limit initially, then the pressure should decrease. When the balloon comes within its elastic domain the pressure exerted by it should increase. We need to convert this into a theory to predict the flow rate as a function of volume of balloon. Even a simulation can be made. Applications of this research are in making artificial bladders in case some patient needs one. Physics
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6/19/2016 0:11:59Gyanigya@doonschool.com
A metal/rubber/wooden/plastic/glass ball is dropped from different heights on a metal plate fixed horizontally. How does the frequency/loudness/duration of sound produced by the collision vary with the incident impact energy?
Physics
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