Q: Which of the following is the correct order of magnitude estimate for the mass of an elephant?

$$6 \times 10^3$\ \mathrm{kg}$$

Question 1

Which of the following best describes the primary goal of physics?

Accepted Answer

To study the fundamental laws of nature and express them as mathematical equations.

Question 2

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

Accepted Answer

Kilogram (kg)

Question 3

A football field is approximately $$1 	imes 10^2$ meters in length. Which of the following is the correct scientific notation for this length?

Accepted Answer

$$1 	imes 10^2$ m

Question 4

Which of the following statements about significant figures is correct?

Accepted Answer

The number of significant figures in a product is determined by the number with the fewest significant figures.

Question 5

A worm slithers at $$1.58\ \mathrm{cm/s}$$ for $$16.28\ \mathrm{s}. $$How far does the worm travel, using the correct number of significant figures?

Accepted Answer

$$25.7\ \mathrm{cm}$$

Question 6

Which of the following is the correct definition of a second in the SI system?

Accepted Answer

The time for radiation from a $$^{133}\mathrm{Cs}$$ atom to complete $$9,192,631,770$$ oscillation cycles between spin levels.

Question 7

Which prefix represents $$10^{-6} in $$the SI system?

Accepted Answer

Micro

Question 8

If you multiply $$2.1\ \mathrm{m} by$$ $$4.1\ \mathrm{m}$$, how many significant figures should your answer have?

Accepted Answer

2

Question 9

Which of the following is NOT a base SI unit?

Accepted Answer

Liter (L)

Question 10

A student measures the diameter of a CD as $$1.0 	imes 10$$^{-1}$$ meters. What is this value in centimeters?

Accepted Answer

$$10\ \mathrm{cm}$$

Question 11

Which of the following best describes dimensional analysis?

Accepted Answer

A method to check that all terms in a physical equation have the same dimensions.

Question 12

Which of the following is the correct order of magnitude estimate for the mass of an elephant?

Accepted Answer

$$6 	imes 10^3$\ \mathrm{kg}$$

Question 13

Which of the following is the correct way to write $$2500 in $$scientific notation with three significant figures?

Accepted Answer

$$2.50 	imes 10^3$

Question 14

A human reaction time is approximately $$1 	imes 10$$^{-1}$$ seconds. Which of the following is this value in milliseconds?

Accepted Answer

$$100\ \mathrm{ms}$$

Question 15

Which of the following is a correct step in the general problem-solving strategy for physics?

Accepted Answer

Visualize the physical process.

Question 16

Which of the following is the correct conversion for $$5\ \mathrm{km} to $$meters?

Accepted Answer

$$5000\ \mathrm{m}$$

Question 17

Why are order-of-magnitude calculations useful in physics?

Accepted Answer

They help check for errors and estimate values when precise calculations are not possible.

Question 18

Which of the following is the correct SI prefix for $$10^{12}$$?

Accepted Answer

Tera

Question 19

A measurement is recorded as $$0.000036$$ meters. How many significant figures does this value have?

Accepted Answer

2

Question 20

When adding $$2.21$$ and $$1.35$$, and then multiplying the sum by $$8\%$$ tax, which of the following best explains why the final answer may differ depending on the calculation order?

Accepted Answer

Because of round-off error due to insignificant digits.

Introduction to Physics: Units, Measurement, and Problem Solving

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