Topic: Who's good at sciencey-mathy things?

[UncleBob]

A wild poll appears!

[BlackNMild2k1]

Where is the option for 88mph?

[oohhboy]

Since it is all relative, from the observer on the ground it is all the velocities added together since they are all moving in the same direction. The car at the bottom is moving at 49 MPH, a person standing on the trendmill relative to the car at the bottom moves forward at 50MPH resulting in a speed of 99MPH to the stationary observer. A car travelling on top of a stationary treadmill would result in the car travelling in 100MPH, since the treadmill itself is travelling at 49MPH, that is added, so the final speed is 149 MPH.

Assumptions made are that the treadmill and cars have enough power to maintain it's velocity as additional load is placed upon them. Any resulting acceleration is "instant" or the treadmill is of sufficient length to accelerate the top car to it's final velocity. These assumptions are made as there is insufficient information to make more detailed calculations.

An interesting note 149MPH/129.5 Knots is about the top speed of a C172R in level flight meaning the plane could land on the car without changing it's speed. Also if it landed on the treadmill, the plane's speed would not change.

[pokepal148]

149MPH/129.5 knots
uncle bob find a nice interstate highway and test this... what could go wrong

[BranDonk Kong]

I think I've earned the title of smartest person on the forums.

[oohhboy]

Your lack of comedy option and extra credit disappoint me.

[pokepal148]

are we talking how fast your insurance agent moves in the opposite direction maybe??

[UncleBob]

Now, let's put a cannon-like object on the top of the top vehicle.  When the top vehicle hits the middle of the treadmill, the cannon-like object fires a projectile that, when stationary, the projectile would reach a top speed of 50 MPH.  How fast will the projectile be moving (again, relative to the ground) at top speed?

[BranDonk Kong]

50 MPH.

[ShyGuy]

This thread is frivolous and UncleBob is the worst.

SHOW ME REAL WORLD APPLICATION OR I'M PULLING THE GRANT MONEY

[pokepal148]

Now, let's put a cannon-like object on the top of the top vehicle.  When the top vehicle hits the middle of the treadmill, the cannon-like object fires a projectile that, when stationary, the projectile would reach a top speed of 50 MPH.  How fast will the projectile be moving (again, relative to the ground) at top speed?

you suggested the idea i think you should be the one to embark on this scientific endeavor to test all of this

[Ceric]

Now, let's put a cannon-like object on the top of the top vehicle.  When the top vehicle hits the middle of the treadmill, the cannon-like object fires a projectile that, when stationary, the projectile would reach a top speed of 50 MPH.  How fast will the projectile be moving (again, relative to the ground) at top speed?

I don't think the Projectile could overcome the 49MPH to get out of the tube.

[BlackNMild2k1]

Now, let's put a cannon-like object on the top of the top vehicle.  When the top vehicle hits the middle of the treadmill, the cannon-like object fires a projectile that, when stationary, the projectile would reach a top speed of 50 MPH.  How fast will the projectile be moving (again, relative to the ground) at top speed?

I don't think the Projectile could overcome the 49MPH to get out of the tube.

Only if the projectile and its cannon were both launched to their top speeds at the same time.
Otherwise the projectile would already be moving at 49+mph inside the cannon before it was launched at 50mph ontop of that speed.

At least I think that's how it works.

[ShyGuy]

Somebody needs to go to an airport with two remote control cars. send them on a race. one will hit the moving sidewalk escalator and the other one will drive outside of it. You can see how well the escalator RC car does in comparison.