Cars Definition and 425 Threads

Homework Statement Car A is traveling a distance d behind Car B. Initically both cars are traveling at the same speed of 20.02 m/s. Suddenly Car B applies the brakes, causing Car B to decelerate at 3.05 m/s2. It takes the driver of Car A 0.75 seconds to react, and when she applies her brakes...

if a person is traveling in a car and there was thunderstorming rain, is there any possibility that thunderbolt hits the car?(i read that it is not going to hit the car)

Something I was wondering about. I was doing some calculations on how much energy different types of vehicles consume, and I got a result that surprised me. For big trucks, I found an estimate of 5-6 MPG on the internet, divided the energy content of a gallon of diesel fuel by that, and then...

How far-fetched does the idea sound? Cars that would utilise the power provided by Rossi's cold Fusion reactors. Posting this because I was looking into HHO run cars. And with this kind of small and potentially powerful power source it would be possible. It's speculation, but it sounds pretty...

Man, cars just have no love for bicycles. Even the cars filming the racers in the Tour de France run over cyclists. One minute you're one of the five leaders on a break away in the Tour de France - the next you and your bicycle are flying through the air and you land in a barb wire fence...

Homework Statement Cars B and C are at rest with their brakes off. Car A plows into B at high speed, pushing B into C. Assume the collisions are completely inelastic. What fraction of the initial energy is dissipated in the collision involving car C? Data: MA = 1010 kg; MB = 1250 kg; MC =...

Suppose 2 cars are on a highway going toward each other, each at half the speed of light. Can the driver of one car see the other car as it is going towards him, past him, and away from him? I imagine as the other car was coming towards him, it would get blue shifted out of the visible spectrum...

Homework Statement Two vehicles stick together as a result of the collison. If the 900 kg car was initially at 12 m/s east, then with what speed was the 2200 kg truck traveling north if they move off together in a direction equally north and east. Homework Equations MV = P Pi = Pf...

I was at a bookstore today and overheard a conversation between a few people about how vehicles made by the auto manufacturer "Chevrolet" are notorious for having severe mechanical problems and not starting. Especially their trucks. Is this really true?

Homework Statement I am in grade 11 physics and we are learning efficiency, Eout/Ein.. stuff like that. I just have a few questions about cars: How is efficiency defined in cars and why is it so low in cars? What/How are we improving efficiency? The Attempt at a Solution I think that it...

What I mean by the title is, why isn't it more popular? (I know there DO exist some hydrogen powered cars.) To me it just makes sense to use hydrogen. It is very explosive and it's byproduct is water! The only draw back I can see is storing the gas in the vehicle to be used. Can anyone...

My mom and dad have a muddy driveway and every time I go over there it looks like their vehicles are getting deeper in the mud. He puts gravel in there every year, but that part of town the ground is just so soggy that it's not helping much. So we'd really like some suggestions on how to deal...

I have a question about using NA (naturally aspirated) intake plenums on turbo charged cars and the detrimental effects it may have. Here is a standard NA plenum for an rb30 engine Here is a turbo plenum for an rb30 engine The difference is with the turbo one the plenum (large...

I dropped outta school due to financial problems, after 4 years I finally returned back to school and sadly I had to start over some basics of physics(the worst thing about it is they're not in English and in Chinese instead, I'm an asian of course but I grew up speaking english), which I have...

Ok so I got in a HUGE argument with some people over on a car forum. They say that cars with longer wheelbases are harder to wheelie. I disagreed. I said it not only depends on the wheel base since that is an oversimplified way to look at it, it depends on where the center of gravity is in...

:cry:Homework Statement A 2000 kg car strikes a staitionary 1200 kg car and rebounds at 65.0 km/h@ 20 (deg) Sof E. After collision, the 1200 kg car moves at 40.00 km/h @ 35(deg) N of E. Determine the velocity of the 2000 kg car before the collision. m1= 2000 kg V1(before) = ? V1(after)...

Homework Statement Two automobiles of 540 and 1400 kg collide head-on while moving at 80km/h in opposite directions. After the collision the automobiles remain locked together. The front end of each automobile crumples by 0.60 m during the collision. Find the acceleration (relative to the...

Its probably been done previously but a search didn't return any results for me. But anyway, Vehicle 'a' (Va) travels head-on into Vechicle 'b' (Vb). Both are traveling at 50mph. Both vehicles are identical in weight, tyre grip, transmission, general design, road surface etc. Is the...

Hi, For a mouse trap car that is traveling about 10ft in the least amount of time, is it advisable to use wheels with a large diameter? Basically, I am asking that given two wheels with THE SAME MASS, will the larger wheel always be faster in the same system? I've been thinking and I...

Homework Statement A Civic moving East at 21.48 m/s hits a 1386.25 kg Camry moving West at 32.07 m/s. After the collision, they stick together and move West at 8.38 m/s. What is the mass of the Civic? Homework Equations M1 x V1 + (M2+X)V2 The Attempt at a Solution I feel like I'm...

lets take the situation of a traveling toy car with 1kg of mass... If the maximum force of friction between the car and the road is, let's say, 1N, then is it possible for the car to have >1m/s^2 acceleration?

Two cars approach each other at an intersection. One car has a mass of 928.4 kg and is traveling in the negative y direction with a velocity of 21.4 m/s. The second car has a mass of 951.2 kg and is traveling in the positive x direction with a velocity of 39.5 m/s. If the collision is totally...

Homework Statement One car has twice the mass of a second car, but only half as much kinetic energy. When both cars increase their speed by 7.0 m/s, then they have the same kinetic energy. What were the original speeds of the two cars?Homework Equations Initial, K1 = 1/2 K2 Final, K1 = K2 m1...

Homework Statement A car's engine is 20% efficient. When cruising, the car encounters an average retarding force of 1000 N. If the energy content of gasoline is 40 megajoules per liter, how many kilometers per liter does the car get? The Attempt at a Solution What I tried to do it...

Hey Guys I am having trouble figuring out solution to this Problem 2 Autos are moving along a Highway in a straight line with same magnitude of velocity v. The distance between the 2 autos is d. Now both the autos, A and B have to deaccelerate themselves to velocity v' respectively , when...

Hi guys, I am a newbie here and need help to start my project ! I am studying mechatronics engineering and I plan to make a wireless charging system for electric cars. I know that it uses electromagnetic field for transfering energy, but I can't get enough resources to start my project. Maybe...

Hi all, I have this question from my friends and hope get the answer. Using your car with the oil is not sufficient, the connecting rod is the first to fail. Normally it burns both bearings or the smaller one (connecting to piston) burns first? I think there's a dilemma here: the bigger one...

This isn't a joke topic but don't we have the technology to make a flying car? What's the technology behind it anyway? What's needed to design a flying car? On another note, I bet my cousin 8 years ago that flying cars wouldn't come into existence as a "standard" in 2010 (we were watching back...

Homework Statement A red car and a green car, identical except for the color, move toward each other in adjacent lanes and parallel to an x axis. At time t = 0, the red car is at xr = 0 and the green car is at xg = 220 m. If the red car has a constant velocity of +20 km/h, the cars pass each...

Car 1 hits car 2 and sets car 2 into 180 degree rotation. Both cars are of similar dimensions and about the same weight. What was the speed of car 1 at impact? Assume that car 2 had a speed of 20 mph (29.3 ft/sec) in the opposite direction at impact. I am stuck in using the conservation of...

i would greatly appreciate any help towards this...i thought my workings were correct, but i don't think they are now... http://i21.photobucket.com/albums/b283/NMchugh/Various/velocity.png Question vAx = 80 vAy = 0 vBx = 50 cos(60 vBy = 50 sin(60 First we look at the horizontal...

Homework Statement A car with a mass of 1875 kg is traveling along a country road when the driver sees a deer dart out onto the road. The driver slams on the brakes and manages to stop before hitting the deer. The driver of a second car (mass of...

When I was younger I drove stick shift cars. Reverse gear was always all the way over to the right and down in the cars I drove (MGB and Jetta). I'm car shopping now and thinking about getting a car with manual transmission again. I noticed that some have reverse gear down and right, but...

So I'm trying to determine the frequency of a vehicles tire which is 3 ft in diameter, traveling 65 mph. This is what I have determined so far. r = 1.5 ft v = 65mph = 95.34 ft/s circumference = 2*pi*r = 9.42 ft T = distance/speed = 9.42/95.34 = .0988 so f...

Homework Statement A 1300kg car moving east collided with a 2600 kg SUV moving north at 28 m/s. The vehicles became stuck together . If the speed of the vehicles immediately after the collision was 30 m/s, what was their direction? A) 21 degrees E of N B) 52 degrees E of N C) 58 degrees E of...

Homework Statement How do cars accelerate? Homework Equations f=ma The Attempt at a Solution the only external force on a car is friction,generally forward directioned for the back wheels n backward directioned for the front ones.when a car accelerates how is this friction varied...

I am totally lost with this one... please explain if you know how to do it. Two 5000-kg freight cars roll toward one another (one at 1 m/s and the other at 2 m/s) on a level track. Thus before they collide one car's kinetic energy is 2500 J and the other's is 10,000 J. They collide and...

I'm working on a really important physics assignment and i am in deperate need of help! I need to find some scientific problems with reference to the first petrol engine and the some of the first cars ever made (1887-1912). I have to present some problems which i am to solve later on. The...

Won't a racing car handle better if the back wheels could also steer like the front ones (especially during controlled skids around corners)? It would need to be controlled by computer with settings for tarred or dirt roads.

For an experiment we are doing, we need to be able to accurately detect people inside a car moving at high speed. Any suggestions for an IR/other camera that can help us effectively do it? The car has a hot engine, so I am concerned an IR camera may or may not work. Any thoughts. Cost not a...

[Solved]How fast is the distance between the cars changing at this moment I'm in need of help with the last part (finding dz/dt). I'm sorry I don't know how to use latex. Let D refer to partial derivatives. This was my attempt best try: Given dz/dt = Dz/Dt*dx/d+ Dz/Dt*dy/dt and z...

Hi, I don´t know how this standard type uncertainty calculation can be solved. The situation is as follows: on a graph are three curves with different values, their slope is the speed of each car. The uncertainty of the y-axis (time) is 5%. Now the problem is that i want to display the values...

Two cars travel at the same speed of 105 km/h. One of the cars, a sleek sports car, has a motor that delivers only 35 kW of power at this speed. The other car's motor needs to produce 65 kW to move the car at this speed. Forces exerted from air resistance cause the difference. A) For...

Im completely lost and wanted to know how i can start this. There were two cars that got into a collision and hooked bumpers. How can i determine what the speed of the cars was before they hit each other. All i no is that i can measure the skid marks, but like what else? I have to like write a...

How do they do it? They need to know this to determine optimum braking temperature in order to have best performance braking. Yet, how do they do it? Measure it optically?

Homework Statement Two identical cars (m = 1350 kg) are traveling at the same speed of 25.0 m/s. They are moving in the directions shown in the drawing. What is the magnitude of the total momentum of the two cars...

Hi All Hope this is the right forum, I am looking for an applied approach! I am interested in modelling the behaviour of CO2 powered rocket cars. These small models are powered by releasing pressurised carbon dioxide from a “sparklet” cylinder. The model cars race along 24 metre long...

Homework Statement Two cars are parked beside each other, facing in opposite directions. Car 1 accelerates at 5m/s^2 up to a max. speed of 25m/s, and Car 2 accelerates at 4m/s^2 up to a max. speed of 24m/s. How much time has elapsed when the cars are 200m apart? Homework Equations v=d/t...

Up to now I was absolutely sure it is impossible, but after seeing this video I have changed my mind. Yes, cars can run on water, and whoever says the opposite is a crackpot.

Okay, I know that solar radiation from the sun is already a source of energy to be used as an alternative energy source for light, but solar energy is only one source of light. Scientists have already thought of applying photons as a source of current that would be used to carry out a myriad...