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Chapter 1: Q4. (page 17)

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

Step 1. 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

Step 2. 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

How big is a ton? That is, what is the volume of something that weighs a ton? To be specific, estimate the diameter of a 1-ton rock, but first make a wild guess: will it be 1 ft across, 3 ft, or the size of a car? [Hint: Rock has mass per volume about 3 times that of water, which is 1 kg per liter103cm3or 62 lb per cubic foot.]

L2represents the dimensions for which of the following?

(a) cm2

(b) square feet

(c) m2

(d) All the above

One hectare is defined as1脳104m2. One acre is4.356脳104ft2. How many acres are there in one hectare?

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.

The following formula estimates an average person鈥檚 lung capacity V(in litres, where1L=103cm3):

V=4.1H-0.018A-2.7,

Where H and A are the person鈥檚 height (in metres) and age (in years) respectively. In this formula, what are the units of the numbers 4.1, 0.018, and 2.7?
See all solutions

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