Q: Convert $$5.2 \times 10^3$\ \mathrm{m} to $$kilometers using scientific notation.

$$5.2 \times 10^0$\ \mathrm{km}$$

Question 1

Which of the following best describes the particle model in physics?

Accepted Answer

A model that treats a moving object as if all its mass were concentrated at a single point.

Question 2

A runner moves from $$x_i = 10\ \mathrm{m} to$$ $$x_f = -5\ \mathrm{m} in$$ $$3\ \mathrm{s}. $$What is the displacement of the runner?

Accepted Answer

$$\Delta x = -15\ \mathrm{m}$$

Question 3

Which of the following is a vector quantity?

Accepted Answer

Velocity

Question 4

A car travels $$120\ \mathrm{km}$$ east in $$2\ \mathrm{h}. $$What is its average velocity?

Accepted Answer

$$60\ \mathrm{km/h}$$\ east

Question 5

Which of the following statements about significant figures is correct?

Accepted Answer

Trailing zeros in a whole number with a decimal shown are significant.

Question 6

Convert $$5.2 	imes 10^3$\ \mathrm{m} to $$kilometers using scientific notation.

Accepted Answer

$$5.2 	imes 10^0$\ \mathrm{km}$$

Question 7

A ball is thrown and follows a curved path before landing. Which type of motion does this represent?

Accepted Answer

Projectile motion

Question 8

If a measurement is $$0.00450\ \mathrm{m}$$, how many significant figures does it have?

Accepted Answer

3

Question 9

A cyclist moves from $$x_i = 3\ \mathrm{mi}$$ east of a water tower to $$x_f = -2\ \mathrm{mi}$$ west of the tower in $$0.5\ \mathrm{h}. $$What is her average velocity?

Accepted Answer

$$-10\ \mathrm{mi/h}$$

Question 10

Which of the following best describes the difference between speed and velocity?

Accepted Answer

Velocity includes direction; speed does not.

Question 11

A vector has a magnitude of $$20\ \mathrm{cm}$$ and makes a $$30^\circ$$ angle with the horizontal. What is the horizontal component of the vector?

Accepted Answer

$$17\ \mathrm{cm}$$

Question 12

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

Accepted Answer

$$\mathrm{m/s}$$

Question 13

A goose flies $$21\ \mathrm{mi}$$ north, then $$28\ \mathrm{mi}$$ east. What is the straight-line distance from its starting point to its final position?

Accepted Answer

$$35\ \mathrm{mi}$$

Question 14

Which of the following is an example of a scalar quantity?

Accepted Answer

Speed

Question 15

If $$1\ \mathrm{mile} = 1.609\ \mathrm{km}$$, how many kilometers are in $$60\ \mathrm{miles}$$? (Use significant figures.)

Accepted Answer

$$97\ \mathrm{km}$$

Question 16

A vector has components $$A_x = 3$$ and $$A_y = 4. $$What is the magnitude of the vector?

Accepted Answer

$$5$$

Question 17

Which of the following best describes the process of adding two vectors graphically?

Accepted Answer

Place the tail of the second vector at the tip of the first vector, then draw the resultant from the tail of the first to the tip of the second.

Question 18

A measurement is recorded as $$540. ($$with a decimal point). How many significant figures does it have?

Accepted Answer

3

Question 19

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

Accepted Answer

micro-

Question 20

A car moves $$100\ \mathrm{ft} in$$ $$5\ \mathrm{s}. $$What is its average speed in $$\mathrm{ft/s}$$?

Accepted Answer

$$20\ \mathrm{ft/s}$$

Chapter 1: Representing Motion – Physics with Algebra Study Notes

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