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CHECK QUESTIONS: Which has the greater density, a cupful of water or a lake full of water? A kilogram of lead or a kilogram of feathers? A single uranium atom or the world? TABLE 12.1 Densities of Common Substances (kg/m) (For density in g/cm, divide by 1000 Solids Density Iridium 22,650 Osmium 22,610 Platinum 21,090 Gold 19,300 Uranium 19,050 Lead 11,340 Silver 10,490 Copper 8,920 Brass 8,600 Iron 7,874 Tin 7,310 Aluminum 2,700 Concrete 2,300 Ice 919 Liquids Mercury 13,600 Glycerin 1,260 Seawater 1,025 Water at 1,000 Ethyl alcohol 785 Gasoline 680 2009 Pearson Education, IncCHECK QUESTIONS Which has more surface area, an elephant or a mouse? 2000 kilograms of elephant or 2000 kilograms of mice? NEXT TIME QUESTION Material Strength -CONCEPTUAL Physics . A . B .C If you drill a hole horizontally through the branch of a tree, you risk weakening the branch. For minimum weakening, drill the hole through the a) upper part, A. b ) middle part, B. lower part, C. ... makes no difference. tout CH 12-1NEXT TIME QUESTION WHY IS WET SAND FIRMER BENEATH YOUR FEET THAN WET GRAVEL?CONSIDER AN INFANT WHO WEIGHS 100 NEWTONS. DURING A YEAR SHE GROWS SO THAT EACH DIMENSION OF HER BODY INCREASES BY 52. NEXT TIME QUESTION CONCEPTUAL Physics COMPARED TO AN EMPTY SHIP, WILL A SHIP LOADED WITH A CARGO OF STYROFOAM FLOAT LOWER IN WATER OR HIGHER IN WATER?NEXT-TIME QUESTION EVERYBODY KNOWS THAT "WATER SEEKS ITS OWN LEVEL." BUT VERY FEW PEOPLE KNOW WHY WATER SEEKS ITS OWN LEVEL. THE REASON HAS MOST TO DO WITH a) ATMOSPHERIC PRESSURE. b) WATER PRESSURE DEPENDING ON DEPTH. C) WATER'S DENSITY.' =3 s NT" '31: MAY NOT SUPPORT THE LOAD. THE CHIEF SUGGESTS THAT SOME OF THE PEOPLE ABOARD GET INTO THE TANK SO THE LOAD WILL BE LESS. IS THIS A GOOD IDEA ORA POOR IDEA