A Little Question - Topic

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Jan 27 2011 10:39pm

Now think if a school bus is going 80mph, a kid at the very back of the bus jumps and in mid air, the bus driver slams his brakes.

juliusjuice

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#12

Jan 28 2011 07:49pm

Quote (Greenzord @ Jan 23 2011 09:27pm)

Hello guys . going to ask here something i think my answer is right buy would like to know some more opinions.

Lets image a car in Highway is travelling at a speed of 80 Miles per hour. Imagine that we have a bee inside a bottle in the car and free her. Shes flying inside the car while the car is moving. She isnt flying ofc at 80mph but how can we explain that shes moving 80mph since shes inside the car and flying and such low speed?

Why this happens?

or.. i am wrong and shes @ 80mph? thats impossible i think

Lmk

2 things are happening. inertia and no drag from air. when the bee exits the window it isnt immediately reduced to 2-3 mph due to inertia, it slows due to drag from air. in a vaccum the bee would never slow down. keep in mind earth is moving 9,000 to 11,000 mph, we dont feel the G-force due to inertia/subtle speed changes (every second of your life you are accelerating/deccelerating). anyways what is relative speed? who is to say what body is not in motion? there is a way to figure it our mathematically by using a constant -speed time elapses relative to any other constant. this is nearly impossible, but in the future we might use this or a clock that tells time relative to the speed of light to judge which direction to accelerate (or deccelerate) to be at rest.

This post was edited by juliusjuice on Jan 28 2011 07:52pm

WhirlingDervish

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#13

Jan 29 2011 02:32am

Quote (sirfrozt @ Jan 23 2011 11:18pm)

thats a question of relativity. relative to you in the car, the bee is only moving at about 2 or 3 miles an hour, but relative to people you pass, yes the bee is moving at around 80 miles an hour.

This

Quote (AEtheric @ Jan 24 2011 12:20am)

Here's an interesitng tidbit from what I know of physics: If the bee is moving at 2 mph, and the car is moving at 80 mph, then with reference to the stationary road the bee is moving at 82 mph. But light, even if emitted by a moving source, is always moving at light speed.

This is the fun stuff, to continue your thoughts .

Toss in some Doppler effect and E=hf and have a party.

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