Q: What is the correct conversion factor to change 2.00 feet to meters?

$$ 2.00 \times \frac{12 \text{ in}}{1 \text{ ft}} \times \frac{2.54 \text{ cm}}{1 \text{ in}} \times \frac{1 \text{ m}}{100 \text{ cm}} $$

Question 1

Which of the following best describes Zeno's Dichotomy Paradox?

Accepted Answer

It claims that motion is impossible because an object must complete an infinite number of tasks to reach its destination.

Question 2

In a motion diagram, if the distance between successive positions of a car is increasing and the time interval between frames is fixed, what can you conclude about the car's speed?

Accepted Answer

The car's speed is increasing.

Question 3

Which of the following is a vector quantity?

Accepted Answer

Velocity

Question 4

Given the equation for average velocity $$ \vec{v}_{avg} = \frac{\Delta \vec{r}}{\Delta t} $$, what does $$ \Delta \vec{r} $$ represent?

Accepted Answer

The displacement vector

Question 5

A ball is tossed straight up. At its very highest point, what is the direction of its acceleration vector?

Accepted Answer

Downward

Question 6

If a car is slowing down while moving to the right, what is the direction of its acceleration vector?

Accepted Answer

To the left, opposite to the velocity

Question 7

Which SI unit is defined by the distance light travels in a vacuum during $$ \frac{1}{299,792,458}  of a $$second?

Accepted Answer

Meter (m)

Question 8

What is the correct conversion factor to change 2.00 feet to meters?

Accepted Answer

$$ 2.00 	imes \frac{12 	ext{ in}}{1 	ext{ ft}} 	imes \frac{2.54 	ext{ cm}}{1 	ext{ in}} 	imes \frac{1 	ext{ m}}{100 	ext{ cm}} $$

Question 9

Which of the following statements about significant figures is correct?

Accepted Answer

The final answer in a calculation cannot be more precise than the least precise measurement.

Question 10

If an object moves from $$ \vec{r}_i  at $$time $$ t_i  to$$ $$ \vec{r}_f  at $$time $$ t_f $$, what is the time interval $$ \Delta t $$?

Accepted Answer

$$ \Delta t = t_f - t_i $$

Question 11

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

Accepted Answer

micro

Question 12

A skier moves from position $$ (x_1$, y_1$)  to$$ $$ (x_2$, y_2$) . $$What is the magnitude of the displacement vector?

Accepted Answer

$$ \sqrt{(x_2$ - x_1$)^2$$ + ($$y_2$$ - $$y_1)^2$} $$

Question 13

If the acceleration vector is perpendicular to the velocity vector, what happens to the object's motion?

Accepted Answer

The direction of velocity changes but the speed remains constant.

Question 14

Which of the following is true about the invariance of intervals in motion?

Accepted Answer

Different observers may disagree on position and time, but must agree on displacement and time interval.

Question 15

What is the SI unit for acceleration?

Accepted Answer

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

Question 16

Which of the following best describes a scalar quantity?

Accepted Answer

It has only magnitude.

Question 17

If a car moves with constant non-zero acceleration, which of the following is true?

Accepted Answer

Its velocity changes at a constant rate.

Question 18

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

Accepted Answer

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

Question 19

In a calculation involving multiplication, if the numbers used have 3, 2, and 4 significant figures, how many significant figures should the answer have?

Accepted Answer

2

Concepts of Motion – Physics 1051 Chapter 1 Study Notes

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