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Chapter 11: Q4Q (page 292)

For an answer to be complete, the units need to be specified. Why?

Short Answer

Expert verified

It is important to specify the units to complete an answer to improve accuracy and give clearer meaning.

Step by step solution

01

Defining magnitude and unit

It is important to specify the units in an answer because it adds more meaning. The number, along with the unit, is called magnitude.

A unit is used to compare the magnitudes of quantities of similar nature. It acts as a reference for measurements.

02

Example showing the importance of units

The value of distance only in figure, say 5, does not convey a clear meaning. After adding the unit meter, it becomes five meters, which conveys distance accurately.

The value of time as only ten does not convey a clear meaning. After adding the unit seconds, it becomes ten seconds, which conveys time accurately.

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Most popular questions from this chapter

Estimate the number of gallons of gasoline consumed by the total of all automobile drivers in the USA per year.

Two children are sending signals along a cord of total mass 0.50 kg tied between tin cans with a tension of 35 N. It takes the vibrations in the string 0.55 s to go from one child to the other. How far apart are the children?

Estimate how many hours it would take to run (at 10 km/h) across the U.S from New York to California.

(Note: Remember that for rough estimates, only round numbers are needed both as input to calculations and as final results.)

What are the merits and drawbacks of using a person鈥檚 foot as a standard? Consider both (a) a particular person鈥檚 foot and (b) any person鈥檚 foot. Keep in mind that it is advantageous that fundamental standards be accessible (easy to compare to), invariable (do not change), indestructible and reproducible.

A student鈥檚 weight displayed on a digital scale is \({\bf{117}}{\bf{.2}}\;{\bf{lb}}\). This would suggest her weight is

(a) within \({\bf{1\% }}\) of \({\bf{117}}{\bf{.2}}\;{\bf{lb}}\).

(b) exactly \({\bf{117}}{\bf{.2}}\;{\bf{lb}}\).

(c) somewhere between \({\bf{117}}{\bf{.18}}\;{\bf{lb}}\) and \({\bf{117}}{\bf{.2}}\;{\bf{lb}}\).

(d) somewhere between \({\bf{117}}{\bf{.0}}\) and \({\bf{117}}{\bf{.4}}\;{\bf{lb}}\).
See all solutions

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