A bead slides without friction around a loop- the-loop. the, Ask an Expert

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Q. Mercury is poured into a tall glass. Ethyl alcohol (which does not mix with mercury) is then poured on top of the mercury until the height of the ethyl alcohol itself is 118cm. The air pressure at the top of the ethyl alcohol is one atmosphere. What is the absolute pressure at a point that is 6.40cm below ethyl alcohol-mercury interface?

Q. A bead slides without friction around a loop- the-loop. The bead is released from a height of 24.7 m from the bottom of the loop-the- loop which has a radius 9 m.

The acceleration of gravity is 9.8 m/s2.

What is its speed at point A? Answer in units of m/s.

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