Calculate the minimum force to lift the ball
A container has a circular hole d=5cm on the bottom and is sealed by a metal ball weighs W=2.452, with radius 4cm. Water is H=20cm deep. Calculate the minimum force F to lift the ball.
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Differentiate the position vector twice with respect to time to find the acceleration, and find its magnitude.
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What is the nominal shear stress at the surface? If a hallow shaft of inside diameter 0.85 times outside diameter is used, what outside diameter would be required to give the same outer surface stress?
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