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Can you help me understand this Physics question?
Questions involving buoyancy and thermodynamicsWeek Three Text book exercises • Ch. 11: Exercises 10 & 30 10. Your friend says that what makes one element distinct from another is the number of electrons about the atomic nucleus. Do you agree wholeheartedly, partially, or not at all? Explain. 30. The atoms that constitute your body are mostly empty space, and structures such as the chair you’re sitting on are composed of atoms that are also mostly empty space. So why don’t you fall through the chair? • Ch. 12: Exercises 9 & 30 9. What happens to the density of water when it freezes to ice? 30. Why is it easier to start a fire with kindling rather than with large sticks and logs of the same kind of work? • Ch. 13: Exercises 7 & 20 7. Why is blood pressure measured in the upper arm, at the elevation of your heart? 20. If you’ve wondered about the flushing of toilets on the upper floors of skyscrapers, how do you suppose the plumbing is designed so that there is not an enormous impact of sewage arriving at the basement level? (Check your speculation with someone who is knowledgeable about architecture) • Ch. 14: Exercises 9 & 38 9. When an air bubble rises in water, what happens to its mass, volume, and density? 38. Two identical balloons of the same volume are pumped up with air to more than atmospheric pressure and suspended on the ends of a stick that is horizontally balanced.
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