Insights Blog
-- Browse All Articles --
Physics Articles
Physics Tutorials
Physics Guides
Physics FAQ
Math Articles
Math Tutorials
Math Guides
Math FAQ
Education Articles
Education Guides
Bio/Chem Articles
Technology Guides
Computer Science Tutorials
Forums
Intro Physics Homework Help
Advanced Physics Homework Help
Precalculus Homework Help
Calculus Homework Help
Bio/Chem Homework Help
Engineering Homework Help
Trending
Featured Threads
Log in
Register
What's new
Search
Search
Search titles only
By:
Intro Physics Homework Help
Advanced Physics Homework Help
Precalculus Homework Help
Calculus Homework Help
Bio/Chem Homework Help
Engineering Homework Help
Menu
Log in
Register
Navigation
More options
Contact us
Close Menu
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Forums
Homework Help
Introductory Physics Homework Help
Kinetic to Elastic Potential Energy
Reply to thread
Message
[QUOTE="logan3, post: 4913507, member: 453643"] [h2]Homework Statement [/h2] A moving car has 40,000 J of kinetic energy while moving at a speed of 7.0 m/s. A spring-loaded automobile bumper compresses 0.30 m when the car hits a wall and stops. What can you learn about the bumper’s spring using this information? Answer quantitatively and list the assumptions that you made. [itex]KE = 40,000 J[/itex] [itex]v_i = 7.0 m/s[/itex] [itex]v_f = 0 m/s[/itex] [itex]\vec s = 0.30 m[/itex] [h2]Homework Equations[/h2] [itex]KE = Elastic PE = \frac {1}{2} k {\vec s}^2 \Rightarrow k = \frac {2KE}{{\vec s}^2}[/itex] [h2]The Attempt at a Solution[/h2] [itex]k = \frac {2(40,000 J)}{(0.30 m)^2} = 888888.88 N/m \sim 8.9x10^5 N/m[/itex] I learned that the bumper's spring has a constant of 8.9x10^5 N/m. I assumed that energy wasn't lost from the point when the car had 40,000 J of KE to when it impacted the wall, i.e. the energy was perfectly conserved. Thank-you [/QUOTE]
Insert quotes…
Post reply
Forums
Homework Help
Introductory Physics Homework Help
Kinetic to Elastic Potential Energy
Back
Top