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When a 2.10-kg object is hungvertically on a certain light spring described by Hooke's law, thespring stretches 2.84 cm.
a) What is the force constant of the spring?b) If the 2.10-kg object is removed,how far will the spring stretch if a 1.05-kg block is hung on it?c) How much work must an external agent do to stretch the same spring 8.20 cm from its unstretched position?
Sometimes mirages are formed when light reflects from of a warm layer of air near a hot surface (like a road). what is the index of refraction of the hot air
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