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Physics
Answer the following question.
Why do we need to know the center of mass of an object? For which objects, its position may differ from that of the center of gravity?
Chapter: [4] Laws of Motion
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Answer the following question.
State Newton’s law of cooling and explain how it can be experimentally verified.
Chapter: [7] Thermal Properties of Matter
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Solve the following problem.
A metal sphere cools at the rate of 0.05 ºC/s when its temperature is 70 ºC and at the rate of 0.025 ºC/s when its temperature is 50 ºC. Determine the temperature of the surroundings and find the rate of cooling when the temperature of the metal sphere is 40 ºC.
Chapter: [7] Thermal Properties of Matter
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A metal sphere cools from 80 °C to 60 °C in 6 min. How much time with it take to cool from 60 °C to 40 °C if the room temperature is 30 °C?
Chapter: [7] Thermal Properties of Matter
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