Mathematical riddle

[paintballrulzs]

I got both of the coin ones.

[bofh]

Heat dissipation. More tire = distributes the energy/heat created from friction into a wider area. If a tire is too cold or too hot it results in a lowered co-efficient of friction... because the frictional properties of rubber change depending on temperature.

Not quite. Consistancy is not the reason.

[dansim]

simple i put em into a soda machine wichever one comes back is fake...

[bofh]

1 step solution:

Put quarters in one of the pans. Rotate the pan quickly, but not enough to throw the quarters. The quarter of a different weight will be at a different height.

Yes, it specifies that it is a math problem. But physics = applied mathematics.

Actually, I think this won't work. Since the lighter coin would have less mass to accelerate and less friction force to do, in the same proportion as the heavier coins, it should accelerate at the same rate. and therefore deccelerate at the same rate.

[t33kyboy]

put 4 on the left, and 4 on the right, and 1... on the table.

um. im stuck.

[Kevmaster]

edit: i thought we were supposed to share our answers....

[notcreative]

the reason sports car have wider tires is then they hook up to the ground better. and then you can handle you car better, less slipage of the tires and they look cooler.

[Tobe2be]

kevmaster thanks for ruining it for everyone that hasnt solved the problem.. i really appreciate it. your the best. keep doing what you do best.

THANKS i apologize for my reply and thanks for your edit... kev = good guy.

[bofh]

the reason sports car have wider tires is then they hook up to the ground better. and then you can handle you car better, less slipage of the tires and they look cooler.

Um, why do they hook up to the ground better?

[Flamebo]

Um, why do they hook up to the ground better?

They have more surface area in contact with the ground.

[bofh]

They have more surface area in contact with the ground.

As I said earlier, friction is NOT dependant on surface area, it is soley dependant on force.

[notcreative]

Why do you think Drag cars have wide bald tires cuz the hook up to the Cement better and transfers potetional energy into kentic energy. In simple terms More rubber touching the ground the better the hook up. Go to a drag competion and ask them that. That is the only answer you will get out of them.

[bofh]

Why do you think Drag cars have wide bald tires cuz the hook up to the Cement better and transfers potetional energy into kentic energy. In simple terms More rubber touching the ground the better the hook up. Go to a drag competion and ask them that. That is the only answer you will get out of them.

Actually I'd bet the good drag racers would know the anwser. And second, tires turn Rotational movement into Linear movement. The engine does the energy conversion.

The question still stands, since friction is not dependant on surface area, why do they have wide tires? Why do they hook up better?

Here's a hint. I know the answer.

[Miscue]

Actually, I think this won't work. Since the lighter coin would have less mass to accelerate and less friction force to do, in the same proportion as the heavier coins, it should accelerate at the same rate. and therefore deccelerate at the same rate.

Bah. The coins would travel up the side of the pan because of centrifugal force. A lighter coin would travel higher up the pan.

[Tobe2be]

SOLUTION:

make piles of 3 coins. A B C
step 1 weigh pile A and B IF the balance the fake coin isnt in pile A or B.if not continue to 2b

Step 2a The fake coin is in pile C and you have 3 coins 1 2 and 3. weigh coin 1 and 2 if they equal then the fake coin is the one NOT on the balance IF not then the fake coin is the lighter one.

Step 2b after weighing pile a and b the lightest pile contains the fake coin. so after you remove the lighter pile continue to step 2a

second part of the coin riddle is.

9 coins one is fake BUT this time you dont know if the coin is heavier or lighter BUT you have 3 turns to figure it out. answer will be posted tomorow.