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Q. An air parcel moves northwards and becomes entrained in a strong westerly flow, circling the entire globe in the space of a few weeks. State the name given to this high-level flow and explain briefly how its structure is related to lateral and vertical gradients of temperature and pressure.

Q. A 400 g ball swings in a vertical circle at the end of a 1.5 m-long string. When the ball is at the bottom of the circle, the tension in the string is 11 N. What is the speed of the ball at that point?

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