Work, Energy, and Power Test Review

He was asked to determine whether a vehicle built to

Info icon This preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Jim is interviewing for a new job as test driver. He was asked to determine whether a vehicle built to test the effects of high accelerations on people is safe. The car, with mass 2000 kg, moving at a speed of 20 m/s runs into a spring that compresses the air in a cylinder and stops the car in 0.30 m. The 70 kg passenger stops in the same distance due to the force of shoulder straps and seat belts on her body. What is the spring constant (DON’T FORGET THE SPRING IS STOPPING THE CAR AND THE PERSON…)? 9.2x10 6 N/m What is the Elastic Potential energy of the spring? 414,000 J How much work does the spring do? 414,000 J What is the force of the spring on the car/person system? 1.38x10 6 N Determine the average force of these restraints on the person during the stop. 46,667 N What is the Power output of the spring on the system if the stop takes 0.7 s? 591,428 W What would happen to the spring constant if we doubled the mass of the car? 4) Jim continues his new job as a test driver. The company asks him to find the coefficient of friction between their new tires and the road. He decides to set up an experiment. He travels in his car at a velocity of 30 m/s and slams on the brakes. The car comes to a stop over a distance of 50 m.
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern