$$3.0 \times 10$$^{10}$$\ \mathrm{pm}$$

Question 1

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

Accepted Answer

Distance is always greater than or equal to displacement, and displacement is a vector while distance is a scalar.

Question 2

A runner completes one lap around a 400 m circular track in 100 seconds. What is the runner’s average velocity?

Accepted Answer

$$0\ \mathrm{m/s}$$

Question 3

Which of the following is a derived SI unit?

Accepted Answer

Newton (N)

Question 4

A car travels 60 meters east, then 80 meters north. What is the magnitude of its displacement?

Accepted Answer

$$100\ \mathrm{m}$$

Question 5

Which of the following equations is dimensionally correct for velocity?

Accepted Answer

$$v = \frac{d}{t}$$

Question 6

Convert $$3.0\ \mathrm{cm} to $$picometers ($$\mathrm{pm}).$$

Accepted Answer

$$3.0 	imes 10$$^{10}$$\ \mathrm{pm}$$

Question 7

A fast runner moves at $$10\ \mathrm{m/s}. $$What is this speed in miles per hour ($$\mathrm{mi/hr}$$)? (1 mile = 1609 m)

Accepted Answer

$$22.4\ \mathrm{mi/hr}$$

Question 8

Which of the following is NOT a vector quantity?

Accepted Answer

Speed

Question 9

A car starts braking at $$t=0 s as $$shown in the motion diagram. What does the decreasing distance between dots represent?

Accepted Answer

The car is slowing down (decelerating).

Question 10

Which of the following best describes projectile motion?

Accepted Answer

Motion with both horizontal and vertical components under the influence of gravity.

Question 11

If you walk 60 meters east, then 80 meters north in 10 minutes, what is your average speed?

Accepted Answer

$$14\ \mathrm{m/min}$$

Question 12

Which of the following is the correct way to represent a vector in component form?

Accepted Answer

$$\vec{A} = A_x \hat{i} + A_y \hat{j}$$

Question 13

Which of the following is a correct unit conversion for time?

Accepted Answer

$$1\ \mathrm{hour} = 3600\ \mathrm{seconds}$$

Question 14

A spinning top is an example of which type of motion?

Accepted Answer

Rotational motion

Question 15

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

Accepted Answer

Speed

Question 16

A car travels 140 meters in 10 seconds. What is its average speed?

Accepted Answer

$$14\ \mathrm{m/s}$$

Question 17

Which of the following is a correct scientific prefix and its value?

Accepted Answer

kilo ($$k$$): $$10^3$$

Question 18

Which of the following best describes the purpose of a coordinate system in physics?

Accepted Answer

To define the position of objects in space and time.

Question 19

A motorcycle moves in a circular path at constant speed. Which of the following statements is true?

Accepted Answer

The velocity is changing because the direction is changing.

Question 20

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

Accepted Answer

$$\vec{v}_{avg} = \frac{\Delta \vec{x}}{\Delta t}$$

Representing Motion: Foundations of Kinematics

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