Solution Found!

Physics / College Physics 1 / Chapter 2 / Problem 20

College Physics | 1st Edition | ISBN: 9781938168000 | Authors: Paul Peter Urone, Roger Hinrichs

Change Question

An Olympic-class sprinter starts a race with an

Chapter 2, Problem 20

(choose chapter or problem)

Get Unlimited Answers

QUESTION:

Problem 20PE

An Olympic-class sprinter starts a race with an acceleration of 4.50 m/s2 . (a) What is her speed 2.40 s later? (b) Sketch a graph of her position vs. time for this period.

Questions & Answers

QUESTION:

Problem 20PE

An Olympic-class sprinter starts a race with an acceleration of 4.50 m/s2 . (a) What is her speed 2.40 s later? (b) Sketch a graph of her position vs. time for this period.

ANSWER:

Solution 20PE

An Olympic-class sprinter starts a race with an acceleration of 4.50 $m/{s}^{2}.$

a.)Her speed at 2.4 s later can be calculated using the equation ${v={v}_{o}+at}_{\ }$ . Now, ${v}_{o}=0$ , $a=\ 4.50\ m/{s}^{2},t\ =\ 2.4\ s$ . So,

${v={v}_{o}+at}_{\ }$ = ${v=0+(4.50)(2.4)}_{\ }=$ 10.8 $m/s$

b.) A graph of her position vs. time for this period can be plotted as shown below.

Assuming that the acceleration is constant ,the position $x$ is given by the equation $x={x}_{o}+{v}_{o}t+1/2\ a\ {t}^{2}$ . Now, ${x}_{o}=0$ , ${v}_{o}=0$ . So, $x=1/2\ a{t}^{2}$ . Plot of time period vs position is as follows

Time period (in $s)$

Study Tools You Might Need

Chapter: Problem: 35

Chemistry 7
In each of the following groups of substances, pick the one that has the given property. Justify your answer. a. highest boiling point: HBr, Kr, or Cl2 b. highest freezing point: H2O, NaCl, or HF c. lowest vapor pressure at C: Cl2, Br2, or I2 d. lowest freezing point: N2, CO, or CO2 e. lowest boiling

Chapter: 28 Problem: 5

Physics for Scientists and Engineers: A Strategic Approach, Standard Edition (Chs 1-36) 4
A 6 flashlight bulb is powered by a 3 V battery with an internal resistance of 1 . What are the power dissipation of the bulb and the terminal voltage of the battery?

Chapter: Problem: 2.2

OpenIntro Statistics 3
Assortative mating. Assortative mating is a nonrandom mating pattern where individuals with similar genotypes and/or phenotypes mate with one another more frequently than what would be expected under a random mating pattern. Researchers studying this topic collected data on eye colors of 204 Scandina

Chapter: 21 Problem: 29

Human Anatomy & Physiology 9
Define hypersensitivity. List three types of hypersensitivity reactions. For each, note whether antibodies or T cells are involved and provide two examples.

Chapter: 0 Problem: 2

Krugman's Economics for AP® (High School) 2
After each of the following events, will the supply curve for the good that is mentioned shift to the left, shift to the right, or remain unchanged? a. The coffee berry borer beetle destroys large quantities of coffee berries. b. Consumers demand more bike helmets than ever. c. The number of tea prod

Chapter: 41 Problem: 1

Biology: The Unity and Diversity of Life 15
Drugs that interfere with sympathetic nerve signals are often prescribed for men who have high blood pressure. How might such drugs impair sexual performance?

Chapter: 11 Problem: 15

Plant Systematics 3
What criteria are used to distinguish between ovule types? Which type is most common and ancestral in the angiosperms?

Chapter: 10 Problem: 22

Physical Science 11
The law of conservation of mass means that a. atoms are not lost or destroyed in a chemical reaction. b. the mass of a newly formed compound cannot be changed. c. in burning, part of the mass must be converted into fire in order for mass to be conserved. d. molecules cannot be broken apart because

Not The Solution You Need? Search for Your Answer Here:

×

Login

Login or Sign up for access to all of our study tools and educational content!

×

Register

Sign up for access to all content on our site!

Or login if you already have an account