$$6.37 \times 10^3$ \text{ km}$

Question 1

Which of the following is NOT an SI base unit?

Accepted Answer

liter

Question 2

A scientist measures the mass of a sample as $$1.234 	imes 10^3$ g. How many significant figures are in this measurement?

Accepted Answer

4

Question 3

Which physical property is described by the SI unit 'ampere'?

Accepted Answer

Electric current

Question 4

A car travels at $$38.0 m/s. $$What is its speed in miles per hour ($$1$$ mile $$= 1609 m$$)?

Accepted Answer

$$85.1$$ 	ext{ mi/h}$

Question 5

Which of the following statements about dimensional analysis is correct?

Accepted Answer

It checks if the dimensions on both sides of an equation are the same.

Question 6

If you multiply $$25.5 m by$$ $$2.45 m$$, how many significant figures should your answer have?

Accepted Answer

3

Question 7

Which of the following is a derived SI unit?

Accepted Answer

joule

Question 8

A measurement is reported as $$1000 m. $$How many significant figures does this value have?

Accepted Answer

1

Question 9

Which of the following best describes a physical property?

Accepted Answer

A property whose value describes a state of a physical system

Question 10

The mean radius of the Earth is approximately $$6.37 	imes 10^6$ m. Express this value in kilometers.

Accepted Answer

$$6.37 	imes 10^3$ 	ext{ km}$

Question 11

Which of the following is the correct dimensional formula for velocity?

Accepted Answer

$$L T$$^{-1}$$

Question 12

A student adds $$135 m $$and $$3.25 m. $$What is the correct answer, considering significant figures?

Accepted Answer

$$138$$ 	ext{ m}$

Question 13

Which of the following is NOT a criterion for categorizing a measurement?

Accepted Answer

Color

Question 14

The distance between two cities is $$100$$ miles. What is the number of kilometers between the two cities?

Accepted Answer

Larger than $$100$$

Question 15

Which of the following best describes the concept of 'order-of-magnitude'?

Accepted Answer

An estimate expressed as a power of ten

Question 16

Which symbol is used to specify the dimension of mass?

Accepted Answer

M

Question 17

A measurement of $$0.0001234 m $$has how many significant figures?

Accepted Answer

4

Question 18

Which of the following is true about measurements in physics?

Accepted Answer

They are known only to within the limits of experimental uncertainty

Question 19

Which SI base unit is used to measure luminous intensity?

Accepted Answer

candela

Question 20

If you divide $$25.5 m by$$ $$2.45 s$$, what is the correct number of significant figures in your answer?

Accepted Answer

3

Physics and Measurement: SI Units, Dimensional Analysis, and Significant Figures

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