Chapter 1, Problem 1.121E

The total length of all the DNA molecules contained in a human body is 1 1010 miles. The population of the United States is about 300 million. What is the total length of all the DNA of the U.S. population in lightyears? (A light year is the distance that light travels in a year and is 9.46 1015 m.)

For these questions, be sure to apply the rules for significant figures. a You are conducting an experiment where you need the volume of a box; you take the length, height, and width measurements and then multiply the values together to find the volume. You report the volume of the box as 0.310 m1. If two of your measurements were 0.7120 m and 0.52145 m, what was the other measurement? b If you were to add the two measurements from the first part of the problem to a third length measurement with the reported result of 1.509 m, what was the value of the third measurement?

Platinum metal is used in jewelry; it is also used in automobile catalytic converters. What is the mass of a cube of platinum 4.40 cm on an edge? The density of platinum is 21.4 g/cm3.

A spherical tank has a radius of 175.0 in. Calculate the volume of the tank in cubic inches; then convert this to Imperial gallons. The volume of a sphere is (4/3) r3, where r is the radius. One Imperial gallon equals 277.4 in3.

Just number 42.

15. Complete this table so that all the measurements in each row have the same value. Use the metric staircase. How mg 6.6 x 10³ 26×107 g 2.8 x 104 cg 28.3 16. What equation is used to determine the density of an object? mass Dz Vakume kg 17. Would the density of a person be the same on the surface of the Earth and o he surface of the moon? Explain.

Which is a conversion factor corresponding to the equation: 1 mile = 1.609 kilometers?   A. 1 mi/1.609 km   B. 1 mi/1 km   C. 1 km/1.609 mi   D. 1 km/1 mi

4. Measure the line and answer the following. 0 cm 1 2 4 a. What is your measurement? 5 6 7 8 9 b. How many significant figures are in your measurement? c. Are both digits to the left of the decimal point significant? 10 11 12 13 14

34. Convert 4.58 x 10³ cm³ to each unit. a. L b. mL c. gal d. qt The m in the equation for density is in italic type, meaning that it stands for mass rather than for meters. In general, the symbols for units such as meters (m), seconds (s), or kelvins (K) appear in regular type, while those for variables such as mass (m), volume (V), and time (t) appear in italics.