- 26 Feb '08 04:45

When the plane reaches rotation speed and the pilot pulls up.*Originally posted by wittywonka***An airplane weighing 175,000 kilograms begins accelerating at 2.2 meters per second per second at an angle 12 degrees above the horizon. How long will it take before the airplane takes off?**

Aren't you supposed to be doing your own homework kiddo? - 26 Feb '08 04:50 / 2 edits

He has a point, anyone who has studied physics could probably answer this but then you wouldn't learn....*Originally posted by mlprior***When the plane reaches rotation speed and the pilot pulls up.**

Aren't you supposed to be doing your own homework kiddo?

Besides don't you need more information than this??

re read the question sorry.... Just about have an ans too.... - 26 Feb '08 05:07

Do you have an answer yet?*Originally posted by wittywonka***An airplane weighing 175,000 kilograms begins accelerating at 2.2 meters per second per second at an angle 12 degrees above the horizon. How long will it take before the airplane takes off?**

Break the lift into horizontal and vertical vectors.

I have an answer but I'm gonna wait for yours first!

- 26 Feb '08 05:32 / 1 edit

Good point!*Originally posted by Mexico***More Importantly Is the pilot a loaf of bread, cause if thats the case then the plane aint going anywhere**

I will eat the bread and a quarter pounder with cheese, thus increasing the overall mass by .3 pounds.

Looks like Witty Wonka has taken off, I never did like that movie.

OK, the answer I got was 21.4 seconds...I'm not sure I did that correct though.

Good night! - 26 Feb '08 05:36

If your already near the loaf of bread you already in the plane therefore its a closed system, and not mass is gained..... Unless of course your hiding a revolutionary piece of equipment in your stomach which can convert energy into mass using bread as a catalyst..... Are you? I demand that you share this with the scientific community at large...*Originally posted by mlprior***Good point!**

I will eat the bread and a quarter pounder with cheese, thus increasing the overall mass by .3 pounds. - 26 Feb '08 09:20

Take it to "Posers & Puzzles", Spanky!*Originally posted by wittywonka***An airplane weighing 175,000 kilograms begins accelerating at 2.2 meters per second per second at an angle 12 degrees above the horizon. How long will it take before the airplane takes off?**

edit - on a serious note, surely this belongs there. Have these new fora(forums?) blurred the boundaries? - 26 Feb '08 11:10Ha, well, I confess that I have had physics problems like this one, but this isn't specifically one of my homework problems. Sorry for that confusion.

As proof, I'll solve it (at least I hope).

Because the airplane is accelerating at 2.2 m/s^2 at an angle of*12 degrees*, we start by finding the y-axis component of that acceleration, which we find to be approximately 0.46 m/s^2 (sin12*2.2). From here, we find the force of this acceleration on the airplane, approximately 80,500 N in the upward direction (0.46*175,000). Now, we find the force of gravity acting on the airplane, 1,716,750 N in the downward direction (175,000*9.81). Finally, we divide these forces to find the amount of time it takes for the airplane's force to overcome the force of gravity, approximately**21.3 seconds**(1,716,750/80,500).

Feel free to correct me if I am indeed mistaken. - 26 Feb '08 12:02

Is it a ballistic aeroplane or is it one that acts aerodynamically?*Originally posted by wittywonka***Ha, well, I confess that I have had physics problems like this one, but this isn't specifically one of my homework problems. Sorry for that confusion.**(1,716,750/80,500).

As proof, I'll solve it (at least I hope).

Because the airplane is accelerating at 2.2 m/s^2 at an angle of*12 degrees*, we start by finding the y-axis component of that acceleration, which we ...[text shortened]... y [b]21.3 seconds

Feel free to correct me if I am indeed mistaken.[/b]

If it is a ballistic one you might be right, but then it is not a normal aeroplane. - 27 Feb '08 01:27

wrong.*Originally posted by wittywonka***Ha, well, I confess that I have had physics problems like this one, but this isn't specifically one of my homework problems. Sorry for that confusion.**(1,716,750/80,500).

As proof, I'll solve it (at least I hope).

Because the airplane is accelerating at 2.2 m/s^2 at an angle of*12 degrees*, we start by finding the y-axis component of that acceleration, which we ...[text shortened]... y [b]21.3 seconds

Feel free to correct me if I am indeed mistaken.[/b]

the plane will never take off, unless you consider the lift caused in the wings (proportional to the horizontal speed). But that's not included in the problem.

The plane in the problem will always have the same vertical and horizontal acceleration, and will never overcome gravity. - 27 Feb '08 01:30

I think the problem was simplified to ignore wing lift and assume the 12 degrees was simply it taking off..... Like many other basic physics problems....*Originally posted by serigado***wrong.**

the plane will never take off, unless you consider the lift caused in the wings (proportional to the horizontal speed). But that's not included in the problem.

The plane in the problem will always have the same vertical and horizontal acceleration, and will never overcome gravity.