At what speed should you swing it so its acceleration

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Q. Earth is farthest from the Sun in July and closest to the Sun in January. During which Northern Hemisphere season is Earth moving fastest in its orbit?

Q. You swing a 2.20 kg stone in a circle, using the full length of a thin 70.0 cm rope. At what speed should you swing it so its acceleration will be 9.8 {rm m/s^2}?

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