So you�re Bored??

Houlbt wrote: re: the coins.... label the bags A B C D E... take 1 coin from A, 2 from B, 3 from C, 4 from D, 5 from E. Take these coins and weigh them... if total weight is... 150.. then you've done something wrong. 149... then A is the light coins 148... then it's B 147... then it must be C etc. More importantly... Liverpool Champions of Europe. The car wheel one... not sure how to explain that though I get the concept (I think)

Is the correct Answer.

 

you ppl type to fast for me

Ok, so if it's not a trick question or has a silly answer it must be pure physics?

Can't be bothered to awaken the moths and try and remember things, or come up with a convincing equation! but it's to do with the inertial forces and the mass acting upon the wheel from the car. when the wheel comes of there's less force acting down on the wheel, and thus less friction between the wheel and the road, the force acting from the hub cancelling the rotational force on the wheel at a certain point (at the bottom of the wheel!  at all other points the wheel has a mass rotational force) when the wheel is left to freely rotate (comes of) the mass force is transferred to the wheel and less to the road resulting in a translation to horizontal movement from an accelerated rotation about it's axis. basically the wheel travels in the direction of strongest inertia tangentially!

I might look for an equation later!  but as f=ma you reduce the opposing force which is caused by friction on the mass of the car, thsu increasing the force applied to the wheel itself, so:

increased f = m(constant for the wheel) x increased a

G0ph3r wrote: <FONT face=Arial>Ok People here's another Brian Teaser for you: <FONT face=Arial>You are given 5 bags. There are 10�Coins in each of the bags. In four of the bags, the Coins each weigh 10 grams.� In the remaining bag,� each Coin weighs only 9 grams. All the bags and Coins look identical. You must� find out which bag has the lighter Coins. <FONT face=Arial>The problem is that all the bags look identical and all the Coins look identical. You can use a scale, but it has to be a single-tray scale, not a two-tray balance scale.� Also, you may use the scale only once. <FONT face=Arial>How can you find out which bag has the lighter Coins? <FONT face=Arial>Puzzlers............Begin

Son came up with this answer, is he correct again (he gets this from his Mum!)

1 coin from bag 1
2 coins from bag 2
3 coins from bag 3
4 coins from bag 4
5 coins from bag 5

If the scale reads 149g then the coins in bag 1 weigh 9 grams
If scale = 148g then bag 2 is the light bag
If scale = 147g then bag 3 is the light bag
If scale = 146g then bag 4 is the light bag
If scale = 145g then bag 5 is the light bag

Dan

I do!

No still not it.

Ok, I'll put you out of your misery. When the wheel is on the car the weight it is supporting distorts the shape of the tyre so that it is not round i.e the contact patch of the tyre is flattened against the road. This effectively reduces the circumference of the wheel. When the wheel comes off the car it is no longer supporting the weight of the car and so is no longer distorted so it's circumference is not reduced. Assuming zero resistance, the wheel remains rotating at the same rpm as it was when attatched to the car but since it has a greater circumference it will travel further for each rotation.

Simple  

A lift is on the ground floor. There are 4 people in the lift including me.
When the lift reaches 1st floor, 1 person gets out 3 people get in.
The lift goes up to the second floor, 2 people get out 6 people get in.
It then goes up to the next floor up, no-one gets out but 12 people get in. Halfway up to the next floor up the lift cable snaps, it crashes to the floor. Everyone dies in the lift. How did I survive?

pete323 wrote: A lift is on the ground floor. There are 4 people in the lift including me. When the lift reaches 1st floor, 1 person gets out 3 people get in.The lift goes up to the second floor, 2 people get out 6 people get in. It then goes up to the next floor up, no-one gets out but 12 people get in. Halfway up to the next floor up the lift cable snaps, it crashes to the floor. Everyone dies in the lift. How did I survive?

You get out on the first floor

Rhys wrote: You made that one up, right?

Nope, straight out of an engineering magazine

Where do you think you're going with that thing?" asked the bus driver to the young boy.

"Where do you think I'm going? On this bus, of course. Why, can't I?" replied the boy.

"No, of course you can't," said the bus driver in a very annoying way. "It is forbidden to bring any object of length, width, or height greater than one meter on any bus. That thing you're carrying is longer than one meter."

"Fair enough," sighed the young boy. "It's about one meter and twenty centimeters long. But I can pay a ticket for it too."

"It's got nothing to do with a ticket," screeched the driver. "You could buy a dozen tickets, and I still would not let you ride on this bus!"

Frustration grew rapidly within the young lad. "Listen! I need to take this baseball bat to a game I am playing in. I don't drive a car. The cabbies are on strike. And it's raining. What do you expect me to do!"

I don't know, and I don't care anyway. You ain't gonna come on this bus with that bat. End of story."

Quickly, the young boy dashed into a shop next to the bus stop and came out with a package containing the bat. Smugly, with all thirty-two teeth on display, he showed the package to the bus driver. "Now can I come on the bus?"

With a snort, the bus driver pulled out a folding rule and performed a precise measurement. Scowling, he waved in the smug young lad.

How did the boy manage to pack a 1.2 meter baseball bat into a package less than one meter?