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Problem Solving Center
Homework 4

1 .       Which one of the following objects is the most dense?

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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 =

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3 .       Which one of the following numbers is incorrectly rounded off to three significant figures?

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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?

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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?

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6 .       Zinc has a density of 446 lb/ft3. What is the density of zinc in g/cm3?

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7 .       Perform the indicated operations, expressing the answer to the proper number of significant figures.

13.236 L + 6.2 L - 5.28 L =

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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.)

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9 .       If there are six iggs per ogg and three oggs per id, how many iggs are in four ids?

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10 .       Which number of significant figures is incorrect?

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11 .       The average distance from the Earth to the Moon, 383,000,000 m, can also be expressed as

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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?

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