General Physics 1: Units and Vectors

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Questions and Answers

What is considered the foundation of all Sciences?

Physics (correct)

Biology

Mathematics

Chemistry

What does the international system (SI units) aim to achieve?

Establish a global currency for scientific research

Facilitate the teaching of complex scientific concepts

Provide a universal system of equations

Ensure consistent measurement understanding among scientists (correct)

What does a physical quantity describe?

A specific theoretical concept

The qualitative aspects of a phenomenon

A characteristic measured quantitatively (correct)

A behavior of matter under pressure

How was the unit of meter defined in 1960?

Based on the wavelength of light from krypton atoms Signup and view all the answers

What defines the unit of time in the SI system?

A fraction of the mean solar day Signup and view all the answers

Which of the following is NOT a tip for learning Physics effectively?

Ignore problem-solving practice Signup and view all the answers

What does light travel a distance of in a vacuum in one second according to the meter's definition?

Exactly 299,792,458 meters Signup and view all the answers

What describes the nature of Physics as a science?

It is an experimental science explaining various phenomena Signup and view all the answers

What is the reason for converting units in measurements?

To ensure measurements are accurate and comparable Signup and view all the answers

How many inches are in 3 meters? (1 meter = 39.37 inches)

118.1 inches Signup and view all the answers

What is the role of significant figures in a measurement?

They indicate the precision of the measurement Signup and view all the answers

In terms of precision and accuracy, what does precision refer to?

The consistency of repeated measurements to each other Signup and view all the answers

According to significant figure rules, how many significant figures are in the number 20,007?

5 significant figures Signup and view all the answers

What is the degree of uncertainty based on the smallest division of a measurement of 1 mm?

0.1 mm Signup and view all the answers

Which of the following statements is true about rounding numbers?

Round down for digits 1-4, round up for digits 5-9 Signup and view all the answers

What is considered percent uncertainty in a measurement?

The proportion of the absolute uncertainty relative to the true value Signup and view all the answers

How many significant figures are in the number 20,007?

5 SF Signup and view all the answers

Which of the following numbers has two significant figures?

0.0085 Signup and view all the answers

What rule applies to trailing zeros in a whole number when it has a decimal point?

They are significant. Signup and view all the answers

Which of these numbers has infinite significant figures?

π Signup and view all the answers

In the scientific notation 4.56 × 10^3, how many significant figures does 4.56 have?

3 SF Signup and view all the answers

What is the significance of trailing zeros in the number 12,000.0?

They are significant. Signup and view all the answers

Which statement accurately describes leading zeros?

They are never significant. Signup and view all the answers

How many significant figures does the number 12.000 have?

5 SF Signup and view all the answers

What should the answer be limited to when multiplying two numbers with significant figures?

The lowest number of significant figures in the numbers Signup and view all the answers

When performing addition, how do you determine the accuracy of the reported answer?

By limiting the answer to the rightmost column that all numbers have significant figures in common Signup and view all the answers

How many significant figures does the number 0.00057262 have?

6 Signup and view all the answers

What is the significant figure count of the number 123.?

3 Signup and view all the answers

In the number 00001420, how many significant figures are present?

4 Signup and view all the answers

What is primarily ignored when counting significant figures in a number?

Leading zeros before the first non-zero digit Signup and view all the answers

If two numbers 4.56 (3 significant figures) and 0.0089 (2 significant figures) are multiplied, what is the maximum number of significant figures in the result?

2 Signup and view all the answers

What should you do when adding numbers 45.67 (4 significant figures) and 0.534 (3 significant figures)?

Limit the answer to the least number of decimal places among the numbers Signup and view all the answers

What is the definition of 1 second in terms of cesium atom cycles?

1 second is defined as 9,192,631,770 cycles. Signup and view all the answers

What is the mass of the standard kilogram defined by?

The mass of a cylinder of platinum-iridium alloy. Signup and view all the answers

How do you convert 763.0 mi/h to meters per second?

By multiplying by 0.44704. Signup and view all the answers

What is the volume of the First Star of Africa diamond in cubic centimeters?

30.16 cm³. Signup and view all the answers

What is the conversion factor to change kilograms to pounds?

1 kg = 2.20462 lb. Signup and view all the answers

How dense is a solution if the mass of 20.0 mL is 36.8 g?

1.84 g/mL. Signup and view all the answers

What is 65.0ºC converted to Fahrenheit?

149.0ºF. Signup and view all the answers

What prefix represents 10^9 in the metric system?

Giga-. Signup and view all the answers

Study Notes

General Physics Overview

Physics studies phenomena in the universe and explains the nature of surrounding things.
It serves as the foundational discipline for all sciences and emphasizes experimental methods.

Units of Measurement

Physical quantities describe phenomena quantitatively and require consistent units for clarity.
The International System (SI Units) standardizes measurements worldwide, including length, time, and mass.

Definitions of Standard Units

Length: Defined as the distance light travels in a vacuum in 1/299,792,458 seconds, equating to exactly 1 meter.
Time: One second is the duration of 9,192,631,770 cycles of cesium atomic transitions.
Mass: Defined by the mass of a platinum-iridium cylinder at the International Bureau of Weights and Measures, with 1 kilogram standardized.

Unit Conversion

Converting units is essential for clarity in communication of measurements.
Examples include converting miles per hour to meters per second or cubic inches to cubic centimeters.
Familiarity with conversion factors aids in translation between measurement systems.

Measurement Uncertainty

Every measurement has inherent uncertainty, often related to the smallest division of the measuring instrument.
Understanding uncertainty is essential for accurate reporting and interpretation of experimental results.

Significant Figures

Significant figures indicate the precision of measurements, with specific rules governing which digits count.
Non-zero digits are significant, as well as zeros between non-zero digits; leading zeros are not significant.
Trailing zeros in decimal numbers are significant while those in whole numbers without decimals are ambiguous unless specified.

Rounding and Calculating with Significant Figures

Rounding rules dictate that numbers 1-4 round down, while 5-9 round up.
For multiplication/division, the result should reflect the lowest number of significant figures in any of the numbers used.
For addition/subtraction, the answer should be reported with the least precise decimal place common among the numbers involved.

Key Academic Tips for Success

Understand personal learning styles to tailor study methods effectively.
Allocate consistent study time and practice solving various physics problems to enhance problem-solving skills.

Studying That Suits You

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Description

This quiz covers the fundamental concepts of measurement in General Physics 1, including unit conversions and the use of scientific notation. It aims to deepen your understanding of physical quantities and vectors, essential for solving measurement problems in physics.