Q: Convert 8 km to feet using the conversion factors $$ 1 \ \text{mile} = 5280 \ \text{ft} $$ and $$ 1.609 \ \text{km} = 1 \ \text{mile} . $$What is the result?

$$ 8 \ \text{km} \times \frac{1 \ \text{mile}}{1.609 \ \text{km}} \times \frac{5280 \ \text{ft}}{1 \ \text{mile}} = 26252.3 \ \text{ft} $$

Q: Which of the following is a correct example of a derived unit?

Newton (N) for force, where $$ 1 \ \text{N} = 1 \ \text{kg} \cdot 1 \ \text{m} / 1 \ \text{s}^2 $$

Question 1

Which of the following statements best describes the dynamic nature of the Physics World View?

Accepted Answer

It is a body of scientific knowledge that evolves as new ideas are proposed, debated, and tested.

Question 2

Which of the following is NOT a fundamental physical quantity according to the SI system?

Accepted Answer

Pressure

Question 3

A measurement is recorded as $$ t = 3 \ 	ext{d} . $$Identify the physical quantity, unit, and magnitude.

Accepted Answer

Physical quantity: time; Unit: days; Magnitude: 3

Question 4

Which of the following is a derived physical quantity?

Accepted Answer

Speed

Question 5

Convert 8 km to feet using the conversion factors $$ 1 \ 	ext{mile} = 5280 \ 	ext{ft} $$ and $$ 1.609 \ 	ext{km} = 1 \ 	ext{mile} . $$What is the result?

Accepted Answer

$$ 8 \ 	ext{km} 	imes \frac{1 \ 	ext{mile}}{1.609 \ 	ext{km}} 	imes \frac{5280 \ 	ext{ft}}{1 \ 	ext{mile}} = 26252.3 \ 	ext{ft} $$

Question 6

Which of the following best describes scientific notation?

Accepted Answer

A way to write numbers as a product of a number between 1 and 10 and a power of ten.

Question 7

Express the number 0.0000578 in scientific notation.

Accepted Answer

$$ 5.78 	imes 10$$^{-5}$$ $$

Question 8

Which of the following is the correct SI unit for mass?

Accepted Answer

Kilogram (kg)

Question 9

A student measures the speed of a car as 55 miles/hr. Which of the following correctly identifies the physical quantity, unit, and magnitude?

Accepted Answer

Physical quantity: speed; Unit: miles/hr; Magnitude: 55

Question 10

Which of the following is a correct example of a derived unit?

Accepted Answer

Newton (N) for force, where $$ 1 \ 	ext{N} = 1 \ 	ext{kg} \cdot 1 \ 	ext{m} / 1 \ 	ext{s}^2 $$

Question 11

If you multiply $$ 2.0 	imes 10$$^{5}$$  by$$ $$ 3.0 	imes 10$$^{-2}$$ $$, what is the result?

Accepted Answer

$$ 6.0 	imes 10$$^{3}$$ $$

Question 12

Which of the following is NOT a requirement for a theory to be adopted into the Physics World View?

Accepted Answer

It must be proposed by a famous scientist.

Question 13

Which prefix represents a factor of $$ 10$$^{-3}$$  in $$the SI system?

Accepted Answer

Milli-

Question 14

A wall is measured to be 12 ft long. In physics notation, how is this written?

Accepted Answer

$$ L = 12 \ 	ext{ft} $$

Question 15

Which of the following is an example of a real-world application of unit conversion?

Accepted Answer

Converting the distance of a marathon from kilometers to miles for an international race.

Question 16

Which of the following best explains why scientific notation is used in physics?

Accepted Answer

To conveniently express very large or very small numbers.

Question 17

Which of the following is a correct example of a measurement in physics?

Accepted Answer

$$ m = 5 \ 	ext{kg} $$

Question 18

Which of the following is a correct statement about derived physical quantities?

Accepted Answer

They are expressed in terms of fundamental physical quantities.

Question 19

If you move the decimal point 4 steps to the right when converting a number to scientific notation, what happens to the exponent?

Accepted Answer

Subtract 4 from the exponent.

Question 20

Which of the following is a correct example of expressing a physical quantity with magnitude and unit?

Accepted Answer

$$ t = 3 \ 	ext{d} $$

Physics World View, Measurements, Units, and Scientific Notation

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