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December 20, 2014

Homework Help: physics HELP!!

Posted by Katrina on Tuesday, February 20, 2007 at 10:35pm.

3. A rocket car is traveling on a linear horizontal frictionless track when it suddenly runs out of fuel. The car has achieved a speed of 100 meters per second at the very moment the fuel is completely spent. The track then suddenly changes to a 30-degree incline from the horizontal.
(A) Calculate the maximum height above the horizontal track the car will rise just as it comes to a complete stop.
(B) Calculate the distance; measured along the inclined track, the car will travel before coming to a complete stop.
(C) Calculate the total travel time of the car on the inclined plane from the time it enters the track to the time it comes to a complete stop on the inclined track.
(D) Calculate the rate of deceleration of the car on the inclined track.


I dont get the questions, and how they should calculate..Please help explain, I get no idea...THANKS A LOT!

why not?i don't mean to do it for me or give me the answer.i just want some hints.

i'm here asking for help, not asking for blaming, why you have to being so mean?
I did pay attention in class, I just don't get the problem and need some hints. IS THAT ILLEGAL?

It is not right to post a great number of questions under various names, pretending to be other people. We dont cater to answer moochers here. Paying attention is only the start, one has to practice in order to attain proficiency.

On this one, you know the kinetic energy at the start of the hill. That Kinetic Energy will turn into gravitational potential energy at the top. Set KE equal to PE, and solve for height.
For the average speed, it will be half the original speed. For the distance, sketch the figure: you know the height, and you know the angle. For time, you know distance and average velocity.
Finally, or acceleration, you know the change in speed, and the time.
Have fun.

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