Q: A car travels 5280 feet in 1 mile. If you want to convert 3 miles to meters, which conversion factor should you use first?

$$\frac{5280\ \text{ft}}{1\ \text{mile}}$$

Q: Which of the following is the correct way to express 0.00000492 seconds in scientific notation?

$$4.92 \times 10$$^{-6}$$\ \text{s}$$

Q: Which of the following is a correct conversion factor to change minutes to seconds?

$$\frac{60\ \text{sec}}{1\ \text{min}}$$

Question 1

Which of the following is NOT one of the three SI base units most commonly used in introductory physics courses?

Accepted Answer

amperes

Question 2

A car travels 5280 feet in 1 mile. If you want to convert 3 miles to meters, which conversion factor should you use first?

Accepted Answer

$$\frac{5280\ 	ext{ft}}{1\ 	ext{mile}}$$

Question 3

Which of the following statements about significant figures is TRUE?

Accepted Answer

Trailing zeros to the right of a decimal point are significant.

Question 4

A measurement reads 0.041 g. How many significant figures does this value have?

Accepted Answer

2

Question 5

You measure the mass of a ball as 112.3 g and its volume as 12.53 cm$$^3. $$What is the density of the ball, reported to the correct number of significant figures?

Accepted Answer

$$8.97\ 	ext{g/cm}^3$$

Question 6

Which of the following is a derived SI unit?

Accepted Answer

joule

Question 7

A student records a measurement as 0.800 L. How many significant figures are in this measurement?

Accepted Answer

3

Question 8

When adding 12.025 g and 0.64 g, what is the correct way to report the result according to significant figures rules?

Accepted Answer

$$12.7\ 	ext{g}$$

Question 9

Which of the following is considered to have infinite significant figures?

Accepted Answer

A counted value of 5 memory cards

Question 10

A conversion factor is best described as:

Accepted Answer

A ratio of units that is equal to 1

Question 11

A measurement of 32.5 mL is made using a graduated cylinder. According to the rules of uncertainty, how should this measurement be reported?

Accepted Answer

32.5 ± 0.1 mL

Question 12

Which SI prefix corresponds to $$10^{-3}$$?

Accepted Answer

milli

Question 13

If a food label states that you should consume no more than 2500 mg of sodium per day, what is this limit in kilograms?

Accepted Answer

$$0.0025\ 	ext{kg}$$

Question 14

Which of the following is the correct scientific notation for 50,000,000 meters?

Accepted Answer

$$5.0 	imes 10^7$\ 	ext{m}$$

Question 15

Which of the following is NOT a base quantity in the SI system?

Accepted Answer

energy

Question 16

A student measures the width of a memory card as 2.5 cm. According to the rules of uncertainty, which digit is uncertain?

Accepted Answer

5

Question 17

Which of the following is the correct way to express 0.00000492 seconds in scientific notation?

Accepted Answer

$$4.92 	imes 10$$^{-6}$$\ 	ext{s}$$

Question 18

Which of the following is a correct statement about derived units?

Accepted Answer

Derived units are combinations of base units.

Question 19

When multiplying 12.025 by 0.64, how many significant figures should the result have?

Accepted Answer

2

Question 20

Which of the following is a correct conversion factor to change minutes to seconds?

Accepted Answer

$$\frac{60\ 	ext{sec}}{1\ 	ext{min}}$$

Measurement, Units, and Uncertainty in Physics

Guida di studio - Domande di pratica

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