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    Hinged rigid beam vs mass free fall

    Acc. is same for free falling bodies. Take torque about the stationary end of the rod and find angular acc. ## \alpha = \frac{3g\cos\theta}{2l} ## Here ##\theta## is the angle with horizontal of rod, so any point on the rod beyond ##\frac{2l}{3g\cos^2\theta}## will have vetical acc. more than g...
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    Equations needed for force required to lift water Take 2

    Hi Mark Nutley, well if have lots of time then CONGRATULATIONS, you will be wasting least amount of energy,(when you speed some thing you waste energy in speeding things though you just want to go to your next position and then you waste energy in slowing it down at its final postion to stop)...
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    Moment of Inertia Experiment

    Hi welcome to phy forum(everyone does that so i did it too for your first post) Well you dont know the L now but i hope that you know the speed at which the dancer is expanding her/his arms(& her mass and her arms mass....etc). So you will calculate L(t) as a function output of time and you...
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    Equations needed for force required to lift water Take 2

    HI!! Well it is strange that you are doing fluid and have not covered work energy. Anyways what is the approach you are familiar with or trying to think of. Your question is not complete, see lifting water (to a distance)needs not only force but an amount of time on which it is applied...
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    Newtons Law of Gravitation

    I think that Averforde might be saying that if we hold a rod then the force on it might be less (or might be other way, i have totally forgotten my result and calculation),though negligible, than that of if we put it horizontally (rotated by its MIDDLE). Which you can find out newtons...