Indicate which of the following are exact numbers: (a) the mass of a 32-oz can of coffee, (b) the number of students in your chemistry class, (c) the temperature of the surface of the Sun, (d) the mass of a postage stamp, (e) the number of milliliters in a cubic meter of water, (f) the average height of NBA basketball players.

검증된 단계별 안내

Understand that exact numbers are those that are counted or defined, not measured.

Consider (a) the mass of a 32-oz can of coffee: This is a measured quantity, so it is not exact.

Consider (b) the number of students in your chemistry class: This is a counted quantity, so it is exact.

Consider (c) the temperature of the surface of the Sun: This is a measured quantity, so it is not exact.

Consider (e) the number of milliliters in a cubic meter of water: This is a defined quantity (1 cubic meter = 1,000,000 milliliters), so it is exact.

비슷한 문제에 대한 검증된 영상 답변:

이 영상 해법은 위 문제에 도움이 된다고 튜터들이 추천한 것입니다.

영상 길이:

45s

주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

Exact Numbers

Exact numbers are values that are counted or defined and have no uncertainty associated with them. They are typically whole numbers, such as the number of students in a class or the number of milliliters in a liter. Unlike measured values, exact numbers do not have significant figures and are considered to be infinitely precise.

Measured Numbers

Measured numbers are values obtained through measurement and inherently include some degree of uncertainty. For example, the mass of a can of coffee or the temperature of the Sun are measured quantities, which depend on the precision of the measuring instrument used. These numbers are expressed with significant figures to reflect their precision.

Significant Figures

Significant figures are the digits in a number that contribute to its precision, including all non-zero digits, any zeros between significant digits, and trailing zeros in the decimal portion. Understanding significant figures is crucial for interpreting measured numbers, as they indicate the reliability of the measurement and help in performing calculations accurately.