Chapter 1, Problem 1.50QE

(a)

Interpretation Introduction

Interpretation:

The measurement of $\text{0}\text{.08205 kg}$ has to be expressed to three significant figures.

Concept Introduction:

Rules for rounding off:

• When the last digit to be removed is more than 5, the prior number is increased by one.  For example, 1.386  in which to remove 6, we have to round it to 1.39.
• When the last digit to be removed is less than 5, the prior number is not changed.  For example, 4.334 if 4 is to be removed, then the result is rounded upto 4.33.
• When the last digit to be removed is 5, the prior number is not changed if it is an even number but it is increased by one if it is an odd number. For example, if 6.35 is to be rounded by removing 5, have to increase 3 to 4 giving 6.4 as the result. However, if 6.25 is to be rounded off it is rounded off to 6.2.

(b)

Interpretation Introduction

Interpretation:

The measurement of $\text{1}\text{.00795 m}$ has to be expressed to three significant figures.

Concept Introduction:

Refer to part (a)

(c)

Interpretation Introduction

Interpretation:

The measurement of $\text{18}\text{.9984032g}$ has to be expressed to five significant figures.

Concept Introduction:

Refer to part (a)

(d)

Interpretation Introduction

Interpretation:

The measurement of $\text{18}\text{.9984032g}$ has to be expressed to four significant figures.

Concept Introduction:

Refer to part (a)