Trick Pass It On Quiz

[Mise]

Yeah but he sustains that speed because beyond that speed, he will take off and go into space! At 11.2km/s, the Potential Energy due to gravity is exactly equal to the Kinetic Energy due to the velocity of the dog. Imagine a gun firing a bullet. The bullet will go only so far before it falls to Earth. But the Earth is curved, so if you fire it fast enough, it might go in a straight line tangential to the Earth's surface, as opposed to a curved line curving downwards towards the Earth's surface. At 11.2km/s, the bullet's (or dog's) velocity will enable it to travel in a circle, exactly parallel to the Earth's surface. Hence, the tin won't hit the floor. At a higher speed than 11.2km/s, the tin and the dog will both lift off at go into space (ignoring air resistance).

 

[Yaniv]

Yeah but he sustains that speed because beyond that speed, he will take off and go into space! At 11.2km/s, the Potential Energy due to gravity is exactly equal to the Kinetic Energy due to the velocity of the dog. Imagine a gun firing a bullet. The bullet will go only so far before it falls to Earth. But the Earth is curved, so if you fire it fast enough, it might go in a straight line tangential to the Earth's surface, as opposed to a curved line curving downwards towards the Earth's surface. At 11.2km/s, the bullet's (or dog's) velocity will enable it to travel in a circle, exactly parallel to the Earth's surface. Hence, the tin won't hit the floor. At a higher speed than 11.2km/s, the tin and the dog will both lift off at go into space (ignoring air resistance).

I understand what you are saying, that is why in my answer i said "if is not a tirck question"

talk about superdog

 

[Chieftess]

The fastest speed that a dog can run.

 

[Gogf]

Faster than when he started.

 

[Rik Meleet]

2097152 m/s is wrong.

And it is a trick question !!!
BTW there is no limit to the speed the dog is physically able to run (so that's not the trick).

 

[Tomoyo]

Really damn fast.

 

[Gogf]

OK: new quiz-question.

A couple of children are teasing a dog. They tie a tin to his tail. They release the dog and the frightened dog walks away with a speed of 1 m/s. When the tin hits the ground after 1 second, the dog is frightened of the noise and doubles his speed. The tin hits the ground again, 1 second later and the dog hears this and doubles his speed. The tin continues the hit the ground every second, and upon hearing this, the dog doubles his speed.

The poor animal runs all the way from Amsterdam to Istanbul (~3000 km). At which speed does the dog arrive at Istanbul ??

4 m/s?

Ten characters.

 

[Rik Meleet]

It's faster than 4 m/s. More than 100 times faster, but not more than 1000 times faster.

 

[Halcyon]

1024m/s - Faster than the speed of sound. The dog would be unable to hear the tin hit the ground.

 

[Rik Meleet]

Halycon: your reasoning is perfect, but your calculations are off.

 

[Gogf]

It's faster than 4 m/s. More than 100 times faster, but not more than 1000 times faster.

Well, I thought that because you only specified that it hit the ground three times, but okay.

 

[Halcyon]

Ah, I'm confusing MPH with m/s again. Speed of sound in air is about 350m/s, so 512m/s would be the next value.

 

[Rik Meleet]

Yes, we have a winner: Halcyon !!!

The speed of sound is 340 m/s. So at 256 m/s he still doubles his speed when hearing the tin, but at 512m/s (faster than the speed of sound) he doesn't hear it anymore, so he stays at 512 m/s.

 

[Chieftess]

Should we make a rule about no trick questions based on measurements?

 

[Rik Meleet]

Should we make a rule about no trick questions based on measurements?

and none on people sending their arm by mail

If you can't guess it, don't spoil it for the rest of us ...

 

[Halcyon]

Since it appears to be my turn, how's this:

An adventurous young fellow decides to build a house. Not just any house, of course. By most attributes it may seem nothing special when described. One storey, a roof and four outer walls joined at right angles, just as your average square house might do. Each outer wall has two windows, and one side presumably also has a door. It has an inside and an outside, as you might expect.

The oddity is this - at sunrise, sunlight enters the house through each of the eight windows simultaneously, despite their positioning on opposite sides of the house. Naturally, no mirrors or other light-bending apparatus are used, nor has the young gentleman emigrated to a planet in a binary star system.

When asked how this is possible, the young man only replies - "The house has strong foundations!"

How, then, did he do it?

 

[Rik Meleet]

I'm thinking of a sort of Pyramid-shaped house.

 

[Jurimax]

The house is built on the North Pole.

 

[Halcyon]

I'm thinking of a sort of Pyramid-shaped house.

Keep going..

The house is built on the North Pole.

Perhaps you should read the question again.

 

[stratego]

The walls are transparent.