Car Definition and 999 Threads

Homework Statement Car A is traveling at a speed of 31.0 m/s, car B is 3.5 meters behind car A traveling at the same speed. Suddenly, car A comes to a halting stop. Car B's reaction time to the stop is 0.85 seconds. Even if you assume both cars slow at the same rate, a crash will occur. Assume...

Homework Statement A car weighs 2200 lbs, has a peak torque of 750 lb ft at 6500 RPM. Assume a CVT and racing differential keeps the power to all four wheels of the car constant and equal. What is the theoretical 0 to 60 mph time? Homework Equations Fd = \frac{1}{2}m v_f ^2 -...

Hello, I have generally questions here, so I hope, that you will help me 1. How can a moving car become positively charged? 2. If I touch the door of a charged car, sometimes I get something like a shock. Why does it happen? I would appreciate it, if you will answer me. Thanks in advance

Hello all, here is my problem: A car accelerates, starting from rest, with a speed that is given by: v(t)=vm(1-e-at) a) What is the top speed of the car? Explain why. b) How far does the car travel in time t? c) Suppose the car can accelerate from 0 to 60 mph in 2.9s, and has a...

I know there are a lot of parameters involved when insurance companies determine how much they'll charge you, and most are beyond my present control (Age, Driving History, Location etc...), but the most important parameter is the type of car you're looking to insure. I'm hoping to buy a car...

I want to build a 1000 pound car for city driving with a 45 MPH limit. This totally something I want to do.just to say I can. But I'm a machinist with only basic engineering knowledge. My power plant will be a 16 HP OHV gas engine driving a 1800 psi pump coupled to a Bi-directional hydraulic...

Even numbered book problem Homework Statement A person goes for a drive, and after, measured by the odometer, reads 37.35 miles in length. This person then replaces the tires with new ones and goes for the same drive, however, now the odometer reads 36.68 miles. Obviously the new tires are...

I wanted to install a few cigarette lighters in my old 1996 Toyota Camry that my sister just gave me since it only comes with one, and I want to have a dash cam/parking cam AND to charge my phone, and while I'm at it, add one in the back. I located the fuse box, and will find an accessory fuse...

Homework Statement Hi everyone, this is the attempted problem. A car starts from rest and accelerates at 5m/s^2 for 15 seconds. It than decelerates at -2m/s^2 for an unknown time (say t'). Calculate how long it takes for the car to stop Homework Equations I know I should be used...

I always found this an interesting question How can you measure the braking distance of a car with a good reliability in normal conditions? From classical physics, we can assume that the braking distance can be found by determining the work needed to dissipate the vehicle kinetic energy...

Homework Statement The police car with its siren emits frequency of 828hz approaching a buliding at 20m/s. . What's the frequency reflected from the buliding ? the ans is ((340)/(340-20))x 828 = 880hz. What's the frequncy of the reflected sound incident on the approaching police car? The...

I started commuting 65 km (40 miles) each day to go to work. This got me intrigued with the question of which speed I should drive into get the best mileage. The theory is straightforward: at low speeds, the driving is inneficient because the engine must use a set minimum amount of gas to...

A 100kg cart is moving at 2.3m/s. A machine has been designed to apply a force of 1200N over a distance of 0.52m as this cart passes by. How fast will the car now move? [b]3. The Attempt at a Solution I used a=fnet/m where fnet was 1200-0 so the answer I got was 2307.68...

Homework Statement When the a lotus is driven at average speed of 20 m/s the drag force on the vehicle is 400N. If the average fuel conversion is 13% then calculate the distance traveled by the vehicle. Mass of Vehicle = 903kg Volume of fuel tank= 43.5 litre Density of fuel= 775 kg/m^3...

As you drive with your windows open you can hear a sound due to some continuous stream of air that is hitting your face, or whatever. But why is it then, that when you drive past by some obstacle, like a tree, you hear a swooshing noise? What is causing this?

Hello all I am very new to this sight and am not an engineer. I am a mechanic tasked with building a powered drive system for our heat treat car. We currently use a continuous cable loop drive but we would like to change it to air powered gear motors. My question is this, how to size it...

This is not a problem, it is just a concept check :shy: What does it mean that something does not impart linear momentum to the rest of the system? For example grain leaking out a train car.

I don't see why not but is there any reason that i could not use these modules http://www.ebay.com/itm/121370353437?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649 to make a wireless link between this camera and screen...

Hello guys I want to know how the wheel diameter of car affects the car's performance parameters(physical significance) such as 1)speed 2)torque 3)handling. I would also appreciate if some equations are used to substantiate the physical understanding of these.

Homework Statement Ok this question came up on a car forum and i tried to answer it, but I think my answer is way to simple and I solved the problem incorrectly 1. A 2072lb Opel GT goes up 20 degree incline how much horsepower will the car need to get up the hill at the same speed as the same...

I am adding 2 extra rear speakers in my jeep, I have some rca cables comming from the rear speaker pre-amp outputs from the back of my pioneer stereo. My plan which works beutifully is a dc-dc boost module bringing the cars 12v up to 20 for the main amplifier. The main amp is a 2x25...

Something like 23 million sold, all over the world, during the years they were manufactured. It's not simple to explain why they were so popular. They weren't particularly good cars, though they had their quirky strengths: good in snow, being the one I've seen most often mentioned. They got...

So, plenty of us have probably heard about the recent hot car death that will probably become a hugely controversial media circus that everyone will forget about in a few months. I don't know whether the death was intentional or not, but I hope the court makes the correct decision either way. I...

Homework Statement This problem is taken from Kleppner's Intoduction to Mechanics and is problem 2.29. A car is driven on a large revolving platform which rotates with constant angular speed \omega. At time t=0 a driver leaves the origin and follows a line painted radially outward on the...

Hi Physics Forums! I've been browsing these forums for a while now and not actually joining in.. Now I'd like to ask for your help! I'm about to enter into my final year of my degree in Automotive Design and Engineering and need a project. I need to re-design a part of a car and engineer...

As we all know, if a car happens to be struck by lightning its passengers will probably be safe. The usual explanation is that the tires of the car are insulators. The actual reason, as E&M textbooks stress, is that the surface of the car, being a conductor, acts as a Faraday cage. My...

Homework Statement A 2200-kg van traveling north along the interstate at 25 m/s is involved in a perfectly inelastic collision with a 1500-kg automobile driven by a careless motorist who emerges at a speed of 15 m/s form an entrance ramp that makes an angle of 20 degrees with the highway. Find...

For a car modification project, it would be nice to have a function to express the pressure in a volume, as a function of the size of this volume, the amount of air moved by a compressor per unit of time, and the time for how long this compressor has been spinning (assume constant speed). To...

I have a drag car I'm wanting to do some testing on . Would anyone mind giving me some insight. A Pm or on here is fine. thanks.

Homework Statement Homework Equations \vec{\tau} = \vec{F}\vec{l} The Attempt at a Solution I understand this problem except for the part that involves Torque. I would like some help in understanding how the Torque is calculated in this problem. Please look at Figure 9.13 c). I know the axis...

Hi! I have to understand how a parking lock described in a patent works, but I cannot really get it. The text is french, however, there is an online translation into English. The link to the patent is the following...

I've been trying to work out the forces on a car in circular motion around a turn and I'm having trouble understanding what causes a friction force to be directed inward toward the center of the circle. I understand that on a straight path, the torque on the wheels causes them to push back...

8) The diameter of a car's tire is 52cm. While the car is being driven, the tire picks up a nail. a) Draw a graph of the height of the nail above the ground in terms of the distance the car has traveled since the tire picked up the nail. For this part, I drew a graph with the max 52, the mid 26...

I understand the basics but I am a bit lost on what happens in this example. In a car we have an alternator that charges the battery, if the battery is charged to stop it overvolting the regulator essentially shorts power to ground via SCRs (correct me if I'm wrong but this is my understanding)...

Homework Statement Figure shows a section of a cable car system. The maximum permissible mass of each car with occupants is 2800 kg. The cars, riding on a support cable are pulled by a second cable attached to the support tower on each car. Assume that the cables are taut and inclined at θ=...

Hello, I have been set a project where I need to modify a 2 tonne car jack. After evaluation, I ended up choosing a scissor car jack. I would be grateful if anyone would advise on how I can modify the car jack by making it more safe, efficient and decrease the cost.And what sort of calculations...

say a car has 400 horsepower at the fly wheel with a V8. can you divide 400 by 8 to give 50 hp of power transmitted by each piston ? Just for a rough estimate, does it even come close to the real power transmitted by each piston or is way far off and wrong ? The reason why I think of this way...

A car is traveling along a straight road with values of its continuous velocity f(t) in ft/sec as given t \ \ v(t) 0 \ \ 90 10 \ \ 75 20 \ \ 80 30 \ \ 100 40\ \ 90 50 \ \ 85 60 \ \ 80 Est the instantaneous acceleration of the car at t=20 sec. there is no eq for...

Question on Energy conservation -- Car pushing on air column Homework Statement An automobile moving through the air causes the air velocity to decrease and fill a larger flow channel. An automobile has an effective flow channel area of 3 m^2. THe car is traveling at 90 k/h on a day when the...

My 02 jetta misfires on cylinder 3 when it rains, has anyone ever had this problem and do I fix it? Also my horn doesn't work when it rains, I don't know if its related but it seems to odd to me coincidence. Thanks for help.

Fun watching this project develop. Maybe by 2020 this can be a reality? https://www.youtube.com/watch?v=csvt6JBAwBk

A 1,000kg car traveling with a velocity of +20.0meters per second decelerates uniformly at -5.00 meters per second per second until it comes to rest. What is the total distance the car travels as it decelerates to rest? What is the magnitude of the impulse applied to the car to bring it...

When a car turns there is a centripetal force acting at the tyres to get it round the bend. There is also an acceleration of the chassis away from the bend acting at the centre of gravity. These combine to create a torque which causes the chassis to roll about the roll centre. Is this correct...

I have an expected value probability problem. Unfortunately, I do not know enough about mathematics to determine if it is even remotely feasible to try to solve it. The best way to explain it is to disguise it as a physics problem: Imagine a race car on a never-ending straight track. Let's call...

This is another one of those concept problems where if I think about it one way, it makes sense, but if I think about it another way I don't reach the same conclusion...again, any clarifications in explaining this would be much appreciated. A streetcar is freely coasting (no friction) around...

Homework Statement A 1343 kg car experiences an impulse of 30,000 N during a collision with a wall. If the collision takes 0.43 s, what was the velocity of the car just before the collision? A) 22 m/s B) 9 m/s C) 51 m/s D) 18 m/s Homework Equations F=dp/dt p=mv The Attempt at...

Homework Statement A car is traveling round a bend which is banked at an angle of 30 to the horizontal. The bend is assumed to be in the shape of an arc of a circle of radius 80m. the surface of the road is rough and the coefficient of friction between the tyres of the and the surface of the...

Hi, I've read in a website that the drag (air resistance) formula for a car would be different: -> for velocities under 86 km/h Drag = K(coefficient) * V -> for velocities over 86 km/h and under 1200 km/h Drag = K(coefficient) * V^2 I've researched a little bit and only one...

Homework Statement A 1300 kg car is traveling at 25 m/s as it passes the crest of a hill that has a radius of curvature of 120m. Determine the normal force acting on the car at the crest of the hill.Homework Equations The Attempt at a Solution I know that for horizontal surfaces the Normal...

Crash? Just the force from the deceleration not actually being crushed. Thanks