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 Problem Solving Center Homework 4

 1 . Which one of the following objects is the most dense? 2 . Perform the indicated operations and express the answer with the proper number of significant digits. 28.1 cm + 0.53 cm + 75.321 cm = 3 . Which one of the following numbers is incorrectly rounded off to three significant figures? 4 . The distance from Earth to the Moon is approximately 240,000 miles. The Concorde SST has an airspeed of about 2400 km/hr. If the Concorde could fly to the Moon, how many hours would it take, ignoring gravity? 5 . How many dozens of particles of dust are in 2.45 grams if each dust particle has a mass of 2.51 x 10-4 grams? 6 . Zinc has a density of 446 lb/ft3. What is the density of zinc in g/cm3? 7 . Perform the indicated operations, expressing the answer to the proper number of significant figures. 13.236 L + 6.2 L - 5.28 L = 8 . A spherical ball of lead has a diameter of 5.0 cm. What is the mass in grams of the sphere if lead has a density of 11.34 g/cm3? (The volume of a sphere is V = (4/3) r3.) 9 . If there are six iggs per ogg and three oggs per id, how many iggs are in four ids? 10 . Which number of significant figures is incorrect? 11 . The average distance from the Earth to the Moon, 383,000,000 m, can also be expressed as 12 . A student performs an experiment to determine the freezing point of water. Three values are obtained: -2.0°C, -2.2°C, and -2.1°C. The thermometer has a mark for each degree. Which of the following statements is true? Answer choices in this exercise are randomized and will appear in a different order each time the page is loaded.

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