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Chapter 1: Problem 18

Indicate whether each of the following is an exact number or a measured quantity subject to uncertainty. (a) the number of pages in this text (b) the number of days in the month of January (c) the area of a city lot (d) the distance between the centers of the atoms in a gold medal

Short Answer

Expert verified
(a) Exact number (b) Exact number (c) Measured quantity (d) Measured quantity

Step by step solution

01

Assessing The Number of Pages in the Text

The number of pages in a text is an exact count. We can simply flip through the pages and count them, so there is no uncertainty in this number.
02

Assessing The Number of Days in January

The number of days in January is exact as it's defined by the Gregorian calendar. Every January has specifically 31 days, so there is no uncertainty.
03

Assessing The Area of a City Lot

The area of a city lot is subject to measurement. Even though we can obtain a precise value from a blueprint, it is subject to uncertainty based on the accuracy of the measurement devices and techniques used. Therefore, it's a measured quantity.
04

Assessing The Distance Between Atomic Centers in a Gold Medal

The distance between the centers of the atoms in a gold medal is likely measured through scientific methods and devices and cannot be counted exactly. Therefore, it's a measured quantity and subject to uncertainty.

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Most popular questions from this chapter

The volume of a red blood cell is about $90.0 \times 10^{-12} \mathrm{cm}^{3} .$ Assuming that red blood cells are spherical, what is the diameter of a red blood cell in millimeters?

Perform the following calculations; express each number and the answer in exponential form and with the appropriate number of significant figures. (a) \(\frac{320 \times 24.9}{0.080}=\) (b) \(\frac{432.7 \times 6.5 \times 0.002300}{62 \times 0.103}=\) (c) \(\frac{32.44+4.9-0.304}{82.94}=\) (d) \(\frac{8.002+0.3040}{13.4-0.066+1.02}=\)

A non-SI unit of mass used in pharmaceutical work is the grain (gr) $(15 \mathrm{gr}=1.0 \mathrm{g}) .$ An aspirin tablet contains 5.0 gr of aspirin. A 155 lb arthritic individual takes two aspirin tablets per day. (a) What is the quantity of aspirin in two tablets, expressed in milligrams? (b) What is the dosage rate of aspirin, expressed in milligrams of aspirin per kilogram of body mass? (c) At the given rate of consumption of aspirin tablets, how many days would it take to consume 1.0 kg of aspirin?

Briefly describe each of the following ideas: (a) SI base units; (b) significant figures; (c) natural law; (d) exponential notation.

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