Fast moving car

Questions and Answers

how fast do you have to go in a car, before it looks like the wheels are going backwards or not moving?

Q) weve all seen car progs. and when the camera films the car moving, sometimes the wheels look like there not going round or even backwards.

A) NOTHING TO DO WITH THE SPEED OF THE CAR IT IS THE SPEED OF THE CAMERA THAT CAUSES THIS ANOMALY

2 cars, 1 stationery, collide. The stationery car moves backwards 12 ft, how fast was the moving car going?

Q) Assume both cars the same size . Please can someone help - I can't remember my Physics - it was too long ago!

A) First, determine the amount of work it takes to move the stationary car. you did not say the second car kept on pushing, like a parking lot fender bender, it could be conceived that a moving car in first gear could push the stationary one forever The friction of the tires are not mentioned. is it on a flat surface? It is easy to calculate the kinetic energy, but other variables come into play, which are not known.

what gap should be kept between you and the car in front on roads with fast moving traffic?

A) Only a fool breaks the 2 second rule! Once the car in front has passed a stationary object, you should be able to count 2 seconds before you pass the same object, or you are too close. This applies at all speeds, but in adverse weather conditions such as heavy rain or ice, you should at least double it.

when a fly comes through a car window after being quite still, why doesn't it fly to the back of the car?

Q) do you know what I mean? so a fly has been pondering about and it drifts into a window of a fast moving car, why doesn't it go splat on the back window.... ok ok so the car isn't moving so fast. what happens if the car is a convertable?? p.s. I spelt 'convertable' wrong, it should be spelt convertible.

A) as soon as the fly enters the car the fly does not fly to the back because the air inside the car is effectively still so it is just like a fly flying around a room

when a guy is always talking about how fast there car going in front of you all the time what does that mean?

Q) Like in P.E class he ushaly talks to me and then the person right be hind him braging about how fast his van can go and challangging them for a race.Or at youth group he will peal out ofthe drive way trying to show off with his fancy moves with his car.

A) It means they appreciate how thick you are because you cannot spell and have to find another way to impress you. Improve your standard of written and spoken English and they will realise you need other ways of wooing.

why is a bus moving at for example 100km/hr faster than a small car moving at a higher speed, say 120km/hr?

A) Either car or bus 120 km/hr is allway faster than 100km/hr.

What is the best fuel to make a formula fuelers hotwheels car run?

Q) I have a formula fuelers hot wheels car and would like to know what the best thing to use as a fuel is. I've tried cola, alcohol, orange juice etc etc combined with the booster powder/tablets with mixed results. What do I need to use to get a really fast moving motor?

A) after using a multitude of concoctions.my 8 yr old son and me reckon vinegar or something citrusy was the best

I had an accident. It was on the give way, collide with the car on the main road, not too fast,Just on move of

Q) just on move off. Nothing damage to her car and nobody injured. My car was damaged. But she got my insurance details. She gave her insurance company and her address.I dont know her car no. She said "even though there is damage to the car and the people, it doesnt matter. She is going to claim. What can I do? It is my mistake.What can I do ? please help me

A) quit admitting that its your fault. NEVER SAY YOU DID IT!!!!! did I say that loud enough? if she want to claim, make her fight for it. make her prove it. Get a lawyer. but are you ready to spend 1000$ for one? if not, play it slow and smooth. Do not admit guilt! it is your right I don't know what a giveway is, but make sure you have a solid vocabulary when you go to court. First impressions are everything in court.

does a tomato move faster...?

Q) If you throw a tomato at a pedestrian from a fast moving car,does it have more force than a standard pedestrian to pedestrian tomato attack?

A) why are you asking????

Why on the motorway do people drive like morons when they see a police car?

Q) Was on the motorway about 2 weeks ago, the police car was doing smack on 70mph. I moved to overtake but a car in front of me wouldn't get out of the fast lane... I wouldn't undertake with a police car next to me, but eventually the car pulled into the middle lane which i promptly passed. To my horror I saw the police lights go on and thought i was in trouble... but to my surprise (at common sence being shown by a police man) he pulled the driver who wouldn't move out of my way.

A) so he should. and people drive like morons without the police about. what about the idiots who overtake you on a 30mph road only to be in front of you and behind a Que of other cars. they are the wost drivers. also the ones that come off the fast lane at 90 mph and cut right across the reservation only to turn off at the next junction nearly killing or causing a pile up . oh well ! i could go on but this is your question., good luck :-)

The wheels of a fast moving car seems to be rotating in reverse direction. Scientific term for this effect?

Q) One can see this happening in a movie also when a car is moving with very high speed its wheel seems to be rotating in reverse direction.

A) Frequency Aliasing

Why do the tyres of a fast moving car seem to be moving or rotating backwards?

Q) Please answer using simple terms

A) You are watching them on a TV or movie screen and are seeing a consecutive set of snapshots taken one after another with a certain time between snapshots (which is what a movie camera does). The TV or the movie projector shows those snapshots one after the other and your eye thinks things on the screen are moving. For TV the video camera takes 24 pictures per second. On your TV screen you are seeing 30 pictures per second. When you see a wheel going around the photographed tire pictures are going slower than the TV image tire pictures. That makes the same spot on a tire seem to be back from where it should be and it will keep going back at that car speed.

Does your eyesight gets worst if you read in a fast moving car, for example in a highway?

A) Are you reading things on the highway or something in the car? Either way, i doubt your eyesight would get worse. Reading something in the car would probably be unaffected by the fast moving objects (or that they appear that way) around you. However, reading things off the highway may actually help with your ability to read things faster, and improve your eyesight, not hinder it.

Can you take a photo of a racing car moving fast with no blur without a advanced camera or fast shutter speed?

A) Yes, you can. Follow the race car going down the track through your viewfinder and click the shutter while still following the car. Keep the camera on the car just as if it were a movie camera. If you have an autofocus camera, hopefully there is a lock feature on it. If there is, use it, so you don't give the autofocus system a nervous breakdown. The result, if you do it right, is that the car will be sharp and clear and the background will be blurred a little, giving your image the sensation of speed. There are some examples on my Flickr page: http://www.flickr.com/photos/jrhendrix/sets/72157594300239394 Practice a little if you can, maybe shooting cars going down the road untill you are smooth.

Why do so many truck drivers pull out in front of a fast-moving car to pass a truck that they can barely pass?

Q) (causing the driver to slam on the brakes and wait about five minutes - on mountain grades)

A) drivers try to maintain a momentum. On a hill,to lose this momentum sucks big time.Interstate 10 going to Los Angeles is notorious for this. Trucks are also governed at different maximum speeds,so an "owner-operator" truck is likely to be faster,and has to wait his turn in the right lane like anybody else,until he has that small window of opportunity to pass a slower truck. When you make your living as a driver,you really hope that smaller,faster cars will give you a break,as you have to put up with a lot of careless drivers over the road. Most big rig drivers are very good drivers,because they are used to being on the defensive

a slow-moving car may have more kinetic energy than a fast-moving motorcycle. How is this possible?

A) Kinetic Energy Quantity: KE=0.5mv^2 The car has sufficient mass to overpower(regarding factors) the greater velocity of the motorcycle.

Is it possible to generate electricity from the fast moving cars on a highway or through tunnel.?

Q) Millions of cars displacing air and passing closed to road cement dividers, can we produce electricity from this moving force. Also when they pass each other from opposite direction on 2 lane Highway in rural areas

A) I have already seen projects where this is happening. Using pressure of cars through tires on pavement to generate electricity. Try googling "pavement electric generation" as I cannot remember urls or exact locales. Think there were some experiments and prototypes in England, USA, possibly Italy.

If a fly is trapped inside a moving car does it have to fly as fast as the car is travelling?

Q) If a fly is trapped inside a car doing 80mph and the fly is flying around inside the car, is the fly flying 80+ mph just to keep off of the back glass?

A) No. The key for how to think about your question relates to a thing called "relativity and frame of reference". For example, relative to an observer standing on the side walk watching the car go past, the fly is in fact moving at 80 MPH relative to that observer. But, relative to an observer's frame of reference while seated inside the car, the fly is just buzzing around at a few feet per second (very slow as compared to 80 MPH). And with regard to needing to move at 80 MPH to "stay off the back glass"... Since the predominant "frame of reference" is the car, and since the car is affected by effective 80 MPH wind resistance while the fly is not, the fly has no risk of being crushed against the back glass. Unless you get sick of the pest and smash him with a magazine.

Why is it that when a car moves rather fast, the wheel seems to be moving in the opposite direction?

Q) I have noticed the same thing for ceiling fans. It always seem like that they are rotating in the opposite direction when they move really fast.

A) It's a strobe effect. If you only see an object with periodic flashes, and the object is going with a periodic motion, it can appear to stop or go backward. Imagine a wheel turns once per second. You flash it once per second--it looks still. You flash it slightly more slowly--it rotates forward slowly. You flash it slightly more quickly--it rotates backwards slowly. Now really, the wheel and the flashes are much faster, but that's how it works. It's fun to do tricks with strobes like spinning your hands really fast. By adjusting the speed, you can make yourself go backward or stop. Any motion picture acts like a strobe, because it takes frames periodically.

How fast would your car have to be moving for an observer ground?

Q) When parked, your car is 5.1m long. Unfortunately, your garage is only 4.1m long. a) How fast would your car have to be moving for an observer on the ground to find your car shorter than your garage? b) When you are driving at this speed, how long is your garage, as measured in the car's frame of reference?

A) The Lorentz transformation provides the relationships among many physical quantities, including length, in two frames with a velocity difference v. From the ref., L1/L0 (which = 4.1/5.1) = sqrt(1-(v/c)^2) ==> v/c = sqrt(1-(L1/L0)^2) = 0.594735 thus v = 178297166 m/s. The length ratio works in both directions, so you would see your garage as 4.1*(4.1/5.1) m long.