Cars Definition and 435 Threads

A car capable of a constant acceleration of 4.85 m/s^2 is stopped at a traffic light. When the light turns green, the car starts from rest with this acceleration. At the very same moment, a truck traveling with constant velocity 17.2 m/s passes the car. As the car's velocity increases, it...

At the instant a traffic light turns green, a car starts moving with a constant acceleration a of 3.07 m/s2. At the same instant a truck, traveling with a constant speed of 9.72 m/s, overtakes and passes the car. How far beyond the traffic light will the car overtake the truck? I've been...

car 2 is twice as long as car 1 when they are at rest a stationary policeman observes that car 2 is the same length as car 1 as car 2 passes car 1 going through a speed trap. car 1 is going 1/2 the speed of light I tried to solve this with L 1/sqrt(1-(1/2)^2) = 2L/sqrt(1-v^2/c^2) and...

Has anybody heard of this myth/urban lengend? Any thoughts on how feasible it is? This only applies to cars that can be unlocked by that remote button on your key ring. Should you lock your keys in the car and the spare keys are home, and you don't have "OnStar," here's your answer to the...

For my physics assignment i have a question on conservation of momentum that i am completely unsure of and have heard mixed answers to from teachers and fellow students. Here is the question and can ai have nice detailed answers please. Thanks in advance. Section A - conservation of momentum...

One of the factors that can produce a winning F1 car is the understanding of turbulent flow, the people that design these cars spend millions on wind tunnels, simply because turbulent flow has not yielded to mathematics, my way of thinking is ,that it is essential to understand turbulent flow...

Homework Statement A stunt driver sets a jump off a horizontal platform and over ten cars. The height of the platform is 1.25 m, and the total distance of the cars is 20.0 m. Find the minimum speed required to safely clear the cars. Homework Equations x - x initial = velocity X t + 1/2...

hello, The other day in class i completed a lab colliding two cars into each other 3 times. The first time velcro was attached to the cars so they stuck together after the collision, the second time a spring was attached to one of the cars and the third time it was just the plain bumpers...

As much as I hate starting a thread about a youtube video, I think this one is important I had no idea stability control was that good; this guy was able to drive on sheet ice. My car does not have stability control or even a limited slip differential, so my left turns in winter are a lot...

In my physics book it says that friction between cars and air can cause a build up of charge on the vehicle's body and that's why a rubber strip is often connected from the body of the car to the ground - to ground the car. Since the tyres which are rubber are connected to metal which is...

I play around with HO slot cars and would like to wind my own "hot" armatures but I can't find any sources of direction. It seems like everyone knows how to do it so why explain:frown: I've bought a couple of pounds of mag wire in different guages but I would hate to tear up a good one to...

A 2000kg car traveling to the right at 30 m/s is chasing a second car of the same mass that is traveling to the right at 10 m/s 1) if the two cars collide and stick together, what is their speed after the collision? 2) What fraction of the initial kinetic energy of the cars is lost during this...

Is it true that there are metal wires in the tires of two wheelers where as car tires come with metal plates inside them?

Hi there, this is my first time opening a thread here, i have heard a lot about this site, and how usefull the people are on this site, so please help me out. Okie, For my summative in Physics, i need to talk about physics about R/C car, so right now, i have a few questions, please bare with...

Hey, there. I'm in high school physics, so hopefully this problem will alow you guys to think creatively without hurting your braincells. We're supposed to build a car out of index cards/file folders, tape, glue, straws, paperclips and rubberbands only. The car must go at least 20 ft and...

hello every one while surfing i came across this site http://netmar.com/~maat/archive/feb2/carplans.htm it has some plans and drawings for adapting an ordinary petrol/gasoline engine to run on water i just started university as a mechanical engineer may be i will take this as a final...

almost there-inelastic collision at an angle Two cars, both of mass m, collide and stick together. Prior to the collision, one car had been traveling north at speed 2v, while the second was traveling at speed v at an angle phi south of east. After the collision, the two-car system travels at...

Please check my answers. A 1200-kg station wagon is moving along a straight highway at 12.0 m/s. Another car, with mass 1800 kg and speed 20.0 m/s, has its center of mass 40.0 m ahead of the center of mass of the station wagon. a)Find the position of the center of mass of the system...

Hi, I have this problem that I can't seem to figure out. I'm taking physics in French but I will try my best to translate it. At an instant, two cars, A and B, are 10km away from an intersection of two perpendicular roads. Car A is moving towards the East and has a speed of 30km/h whereas...

today is my first day here so if i violate any rule that apply in this forum please forgive me.. the question is Dr. Silverstein is driving a 1.95 * 10^3 kg car at 55.0Km/hr. He slams on the brakes and comes to rest in a distance of 17.0 m Assume that Dr. Silverstein has a mass of 75.0 kg...

Two cars are driving toward each other on a straight and level road in Alaska. The BMW is traveling at 105 km/h north and the VW is traveling at 43 km/h south, both velocities measured relative to the road. At a certain instant, the distance between the cars is 11 km. Approximately how long will...

These two problems are giving me some guff. Any ideas on how to solve? Two cars approach an intersection of perpendicular streets. Car A is moving north at 10.5 meters per second, and Car B is moving west at 17.1 meters per second. What is the velocity of Car B relative to Car A? (In other...

I don't understand how kinetic energy works: How much kinetic energy does a car have when it moves at 100 km/hr, as compared with when it moves at 50 km/hr? The answer is 4 times as much, but why?

A blue car pulls away from a red stop-light just after it has turned green w/ a constant acceleration of .6 m/(s^2). A green car arrives at the position of the stop-light 4.5s after the light had turned green. What is the slowest constant speed which the green car can maintain and still...

[link looks fishy - deleted by moderator] ok so one of my friends asked this question.. if you are riding in the back of a truck, and the truck is traveling at the speed of a projectile, what happens when the projectile is fired the opposite direction that you are traveling? (see...

I love the corvette. Normally, I hate all American cars because there ugly, they drive like crap, and they break down all the time. But I went to the rev-it-up event at Fed-Ex field today where you could drive any chevy around a track. So I spent the entire day tearing it up in a black and...

http://money.cnn.com/2006/08/22/autos/edr_concerns/index.htm More of the same... On the face of things it seems like a good idea, but as this technology evolves and becomes accepted, I expect this to lead to much more invasive devices and tactics. Already we find that our driving was being...

hey.,.. I am just wondering wat the future is for cars and petrol? are we gona have electric cars or waterfueled cars? wats happening next? how long til petrol runs out?

I was wondering if anyone knows anything on this topic... I know that Mechanical Engineers are found designing cars in the automobile industry, but does anyone know if aerospace engineers (with a degree in aerospace engineering as opposed to mechanical engineering) are qualified (and if they...

So I'm looking into buying a brand new, ultra-compact car. Currently, I'm fixated on the Toyota Yaris, which starts at about $11k. Gets about 33/40 city/highway. I was wondering if there are any other fellow scientists out there driving one of these gas efficient, yet tiny, cars.

"The lower part of a 2.0 meters high road sign is at a distance of 4.0 meters from the car drivers eyes. It's difficult to read the sign at such a distance, as well as when the distance is too short. Investigate how the angle varies when the car is approaching on a straight road. At what...

Hey, I'm trying to make a racing game that will run completely within a browser. It will be similar to BATracer, except that rather than using carsets - a model employed by games such as TOCA, NASCAR and V8 Supercars - I will follow the model employed by Gran Turismo, where you buy a car...

My friend is part of the Tuners club at school. They held a car show today. I thought there was going to be some crapy cars there, people with big mufflers on their civics and such. I'm happy to report that I was wrong! It was really good, I take my hat off for them. They got a local infinity...

Hi The question is In practice the suspension system of cars consists of a spring under compression combined with a shock absorber.which damps the vertical oscillations of the car . Drwa sketch graphs one in each case to illustrate how the vertical height of the car above the road will...

I have to build a mousetrap car that goes at least 40 meters. I know the design should be one big wheel in back, and two small wheels in front. Design aside, anybody have any advice on how to attach the string from the mousetrap to the axel optimally? Should I just wrap the string around...

Where can i get a good book on electric cars?? Does anyone knows a good book dedicated to electric cars? I mean, not a rigorous textbook nor a colourful brochure... Thanks guys

This is going back a ways, but we used to have a car (I think it was the '89 Camry) that seemed to affect our streetlights. The lights often seemed to go on or wink out as we passed under them. Was this one of those you-wouldn't-see-it-if-you-weren't-there things, where it only seems to be...

Car A with u=0/s is on the northbound land of a highway and car B is traveling in th southbound lane at constant u=26.67m/s.At t=0 , A starts and accelerates at a constant rate a(A) . while at t=5 , B decelerates with constant magnitude of a(A)/6 . knowing that when the two carspass each other...

cars A and B are d=60m apart and traveling at u(A)=8.89 and u(B)=6.67.knowing that 45s after driver A apply his brake to avoid overtaking B,the two cars collide,determine the uniform deceleration of car A. i have tried to form eqns using s=ut + 1/2a(t^2) for both cars and substitute into [car...

hey guys..totally confused on this question! How is the goal of safety at odds with aerodynamic efficiency? OK...the way I am interperting is as. How does the goal of safety interefere with the factor, or progress, of Aerodynamic Efficiency...any help on the answer and where to get started?

Flying cars from string theory ? :) This is the link to the short story from http://motls.blogspot.com/2005/11/flying-cars-from-string-theory.html" . My comment: LOL ! But the kid seems to have potential...

Hiya. The problem I'm trying to solve is this: I have two cars, each with the same mass. Speed before Collision of Car1 = Xm/s Speed before Collision of Car2 = Ym/s To solve the problem of what speeds the two cars have after an ELASTIC collision, i used simultaneous equations. My...

I feel so silly for not being able to work this out... The situation is this - two cars going towards each other. Both cars' mass = 1Kg. The speed of car 1, say, is 5m/s. The speed of car 2, say, is 3 m/s. THE IMPORTANT THING TO NOTE IS THAT BOTH CARS ARE TRAVELLING AT CONSTANT SPEED! What I'm...

If you've ever seen races where cars are just rolling down a hill with no engine, you would notice that they always emphasize how light their car is. Why? Isn't heavier better? Just follow me through my thinking here and see where the error is. assumption 1: all objects, without drag (look at...

Here's some questions I need help with... Its about Cars & Corrosion 1. Name six ways that corrosion was tested on cars. 2. State two reasons that corrosion is not benificial. 3. How does ventilation stop corrosion? 4. In what way does mud contribute to corrosion? 5. What are the two...

Probably a dumb question: I've been curious after seeing some of these car bashing type events at universities and such, how is it possible to crush the steel frame of a car using only a mallet/sledge hammer? I thought the steel pillars on the roof of a car was supposed to be able to at least...

I was reading a post in the homework section about friction being able to do positive work. Several people provided examples, and one was the case of a car. Doc Al pointed out that static friction did not do any work on the car because the wheel was not slipping and the friction force acted...

At the instant the traffic light turns green, a car that has been waiting at an intersection starts ahead with a constant acceleration of 3.55 . At the same instant a truck, traveling with a constant speed of 21.0 , overtakes and passes the car. How far beyond its starting point does the...

Ok, here is the prob. You are arguing over a cell phone while trailing an unmarked police cruiser by 25m; both you and the cruiser are traveling at 110km/h. Your argument diverts your attention from the police cruiser for 2.0s (long enough to look at the phone and yell "I won't do that!"). At...

Today while sitting parked in my FIL's van, the one I just put a new thermostat in, but failed to really test to see if it would overheat? A couple miles down the road, it pegs the temp guage. I put the OEM of 192* instead of 160* because it wasnt passing smog, they said the computer this/that...