Q: Which of the following is the correct conversion factor to change kilometers to miles?

$$1\ \text{km} = 0.621\ \text{mi}$$

Question 1

Which of the following is NOT an SI base unit?

Accepted Answer

Pound (lb)

Question 2

Express the radius of a hydrogen atom, $$0.000\ 000\ 000\ 053 m$$, in scientific notation.

Accepted Answer

$$5.3 	imes 10$$^{-11}$$ m

Question 3

A car travels 60 miles. How many kilometers did it travel? (Use $$1\ 	ext{mile} = 1.609\ 	ext{km})$$

Accepted Answer

$$96.54\ 	ext{km}$$

Question 4

Which of the following prefixes represents $$10^{-6}$$?

Accepted Answer

micro ($$\mu)$$

Question 5

A student walks from $$x = 23 m to$$ $$x = -27 m. $$What is her displacement?

Accepted Answer

$$-50 m$$

Question 6

If a car moves from $$x = 0 m to$$ $$x = 100 m $$and then returns to $$x = 50 m$$, what is the total distance traveled and the displacement?

Accepted Answer

Distance: $$150 m$$, Displacement: $$50 m$$

Question 7

Convert $$1.5$$ meters to inches. (Use $$1\ 	ext{m} = 39.37\ 	ext{in})$$

Accepted Answer

$$59.06 in$$

Question 8

Which of the following statements best describes displacement?

Accepted Answer

It is a vector quantity representing the change in position.

Question 9

A speed limit is posted as $$60$$ mph. What is this speed in m/s? (Use $$1\ 	ext{mph} = 0.447\ 	ext{m/s})$$

Accepted Answer

$$26.82 m/s$$

Question 10

Which of the following is a correct use of scientific notation for the distance to the moon, $$384,000,000 m$$?

Accepted Answer

$$3.84 	imes 10$$^{8}$$ m

Question 11

Which of the following is a reason to use SI units in scientific work?

Accepted Answer

SI units are universally accepted and standardized.

Question 12

A sinkhole is described as the size of six washing machines. If one washing machine is approximately $$0.7 m $$wide, estimate the diameter of the sinkhole in meters.

Accepted Answer

$$4.2 m$$

Question 13

Which of the following is the correct conversion factor to change kilometers to miles?

Accepted Answer

$$1\ 	ext{km} = 0.621\ 	ext{mi}$$

Question 14

A runner starts at $$x = 0 m$$, runs to $$x = 100 m$$, then back to $$x = 20 m. $$What is her displacement?

Accepted Answer

$$20 m$$

Question 15

Which of the following is the correct abbreviation and power of ten for the prefix 'kilo'?

Accepted Answer

Abbreviation: k, Power of ten: $$10^{3}$$

Question 16

A car's motion diagram shows equal spacing between dots. What does this indicate about the car's motion?

Accepted Answer

The car is moving at constant speed.

Question 17

If you convert $$5$$ feet to meters using $$1\ 	ext{ft} = 0.305\ 	ext{m}$$, what is the result?

Accepted Answer

$$1.525 m$$

Question 18

Which of the following best describes the difference between distance and displacement?

Accepted Answer

Distance is a scalar and displacement is a vector.

Question 19

A car travels at $$30 m/s. $$What is its speed in mph? (Use $$1\ 	ext{m/s} = 2.24\ 	ext{mph})$$

Accepted Answer

$$67.2$$ mph

Question 20

Which of the following is NOT a correct step in unit conversion using dimensional analysis?

Accepted Answer

Add the conversion factor to the original value.

Physics 101: Measurement, Units, and Motion

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