lizzyboo32
13.07.2019 •
Physics
Consult interactive solution 2.22 before beginning this problem. a car is traveling along a straight road at a velocity of +30.0 m/s when its engine cuts out. for the next 2.46 seconds, the car slows down, and its average acceleration is . for the next 6.79 seconds, the car slows down further, and its average acceleration is . the velocity of the car at the end of the 9.25-second period is +15.2 m/s. the ratio of the average acceleration values is = 1.66. find the velocity of the car at the end of the initial 2.46-second interval.
Solved
Show answers
More tips
- H Health and Medicine What is Autism? Understanding the Basics of This Neurodevelopmental Disorder...
- F Food and Cooking The Most Delicious and Simple Fish in Batter Recipe...
- S Society and Politics 10 Tips for Boosting Your Self-Esteem...
- F Food and Cooking Which Calamari Salad is the Most Delicious?...
- H Health and Medicine Mercury Thermometer Danger: What to do when a thermometer breaks?...
- S Style and Beauty How to braid friendship bracelets?...
- F Food and Cooking Delight for Gourmets: How to Prepare Liver Pate...
- C Computers and Internet How to Learn to Type Fast?...
- H Health and Medicine Angina: Causes, Symptoms, and Treatment...
- D Dating, Love, Relationships How to Overcome Jealousy: Tips and Tricks...
Answers on questions: Physics
- P Physics When we say energy is lost during the production of electricity what do we really mean...
- P Physics For an object to orbit another object a. inertia must be greater than gravity. b. inertia and gravity must be balanced. c. inertia must be less than gravity....
- P Physics Awave with a short wavelength will also have a (2 points) select one: a. high frequency and high energy. b. high frequency and low energy. c. low frequency and low energy....
- P Physics Read no.4 which newtons law is this? 1,2 and 3 only...
- P Physics A bus travels North for 10 miles then turns around and travels 3.75 miles South. What is the displacement of the bus?...
- P Physics WILL GIVE BRAINLIEST...
- P Physics If a company like Waste Management collects all of the paper, bottles, plastic, ete in a single bin, how (True False) can these materials possibly be recycled?...
- P Physics What is the direction of a vector with an x component of -12 m and a y component of 21 m?...
- P Physics Which of these ecosystems would you expect to have the greatest amount of biodiversity a. Deserts b. Rainforests e, Arctic Tundras d. Wetlands...
- S Social Studies What are the two important movements of the Earth? what are the effects of these movements?...
Ответ:
Let be the average acceleration over the first 2.46 seconds, and the average acceleration over the next 6.79 seconds.
At the start, the car has velocity 30.0 m/s, and at the end of the total 9.25 second interval it has velocity 15.2 m/s. Let be the velocity of the car after the first 2.46 seconds.
By definition of average acceleration, we have
and we're also told that
(or possibly the other way around; I'll consider that case later). We can solve for in the ratio equation and substitute it into the first average acceleration equation, and in turn we end up with an equation independent of the accelerations:
Now we can solve for . We find that
In the case that the ratio of accelerations is actually
we would instead have
in which case we would get a velocity of
Ответ: