Question

10.005 m 10.00 10.05oom = 26.055 3dcc. 10.0500 m P 4. Significant figures and units. The density of aluminum is 2.70 g/mL. An aluminum foil measuring 20.5 am in length and 15.2 cm in width has a mass of 1.683 grams, what is the thickness of the foil in centimeters reported to the correct number of significant figures? 1 mL - exactly 1 cm'. Show your work. lxwxh ness 20.5cm x 15.2 cm x X 2no- -4.54 density om 1.683 200- / 2.70 e-m aiiwch (2015) 15.2) 20.5cmx 15.20mx T. 311. 6T -500 200cm 2.70 slem? 1.683g. (20.5cm (15.2 com)h. 5. Significant figures and units. You want to buy 1.0 lb) of sugar from a bulk goods store (where you can measure out exactly how much sugar you need). You scoop some sugar onto a scale, and the first scoop weights 12.5 oz. How much more sugar in units of oz. do you need to weight out, reported to the correct number of significant figures? 1 lb. = exactly 16oz. 2.50 162 16oz 12.502 = 12.5lb 16oz 2 sig fiss 1.0lb, 16 oz - 1602 total= first 4 secol - 15 - 16oz 16oz = 12.5+ 6-12.5 = 3.3 =4) Quick gut check: Which weighs more: a ton of bricks or a ton of feathers? Which has a higher density?

Answer 1

Both weigh exactly the same, one ton. But since the bricks have a higher density, this ton will occupy much less volume than the ton of feathers.

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