Q: Express 299,800,000 m/s in scientific notation.

$$3.00 \times 10^8$ \text{ m/s}

Q: Rewrite $$0.00016 kg in $$scientific notation.

$$1.6 \times 10$$^{-4}$$ \text{ kg}

Q: Which of the following is a correct conversion factor for length?

$$1 \text{ ft} = 0.305 \text{ m}$$

Question 1

Which of the following is NOT a base S.I. unit?

Accepted Answer

Foot

Question 2

A measurement must always include which two components?

Accepted Answer

A number and a unit

Question 3

Convert 7.62 kg to micrograms ($$\mug).$$

Accepted Answer

$$7.62 	imes 10^9$ $$\mu$$g

Question 4

Express 299,800,000 m/s in scientific notation.

Accepted Answer

$$3.00 	imes 10^8$ 	ext{ m/s}

Question 5

How many significant figures are in the number 0.00900?

Accepted Answer

3

Question 6

Which of the following is a vector quantity?

Accepted Answer

Force

Question 7

A runner moves from $$x_0 = -2$ m to x = 7$ m. What is the displacement?

Accepted Answer

$$9 m$$

Question 8

You jog 15 m in 2 s, then 9 m backwards in another 2 s. What is your average velocity for the total trip?

Accepted Answer

$$0.75$$ 	ext{ m/s}

Question 9

Convert 850 ft to kilometers (km).

Accepted Answer

$$0.259$$ 	ext{ km}

Question 10

A car moves right at $$10 m/s. $$After $$4 s$$, it is moving right at $$30 m/s. $$What is the acceleration?

Accepted Answer

$$5$$ 	ext{ m/s}^2$

Question 11

Which metric prefix represents $$10^{-6}$$?

Accepted Answer

Micro-

Question 12

A sidewalk is $$2.293 m $$wide and $$90 m $$long. What is its area, expressed with the correct number of significant figures?

Accepted Answer

$$210$$ 	ext{ m}^2$

Question 13

What is the difference between distance and displacement?

Accepted Answer

Distance is always positive, displacement can be negative

Question 14

A baseball pitcher throws a ball at $$44 m/s. $$How long does it take to travel $$18.5 m to $$home plate?

Accepted Answer

$$0.42$$ 	ext{ s}

Question 15

Which of the following is NOT a rule for counting significant figures?

Accepted Answer

Always eliminate non-zero digits

Question 16

You walk to the right at $$3 m/s $$for $$8 s$$, then turn around and walk backwards at $$2 m/s $$for some unknown time. You end up $$16 m to $$the right from where you started. How long did you walk backwards?

Accepted Answer

$$2$$ 	ext{ s}

Question 17

What is the S.I. unit for force?

Accepted Answer

Newton

Question 18

Rewrite $$0.00016 kg in $$scientific notation.

Accepted Answer

$$1.6 	imes 10$$^{-4}$$ 	ext{ kg}

Question 19

Which of the following is a correct conversion factor for length?

Accepted Answer

$$1 	ext{ ft} = 0.305 	ext{ m}$$

Question 20

A car brakes with an acceleration of $$4.6 m/s$^2$$ from $$37.5 m/s to$$ $$25 m/s. $$How long does it take to slow down?

Accepted Answer

$$2.72$$ 	ext{ s}

Ch 01: Representing Motion – Foundations of Measurement in Physics

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