Cars Definition and 425 Threads

It is strange to talk about this in a scientific and high tech forum. Are we really better off with all the high tech gadgets in our lives? I was an EE and manager of EE for 30yrs before I retired. Even though my specialties is analog & RF. I had my share of designing hardwares using MPU and I...

I am a student at a mechanical college, current topic of discussion is multi plate clutches. I understand that the clutch is engaged when the pedal is released, with allows the springs to expand, pushing together the plates, that will transfer the torque in to the drive shaft (if in very brief...

Model attached below. Changed Sarah's 65 mph to m/s and got 29 m/s. Sarah's initial position is positive. Her initial velocity is negative. Her acceleration is positive; Andrew's initial position is negative. His initial velocity is positive. His acceleration is negative. Graph is attached...

Hello all, I am sadly stuck on the last part of a circular motion question sheet I was given for homework. I have a mark-scheme with me, but it has actually given me more questions than answers. I have attached my working, and how I arrived at my answer, and the differences it has with the...

I have no idea about this, I hope it's not a controversial subject. I know it's been around, it's not new. All I know is H2 is dangerous. Other than that, I have no idea. Just want to hear from people with scientific knowledge. Thanks

Is there some aerodynamic advantage to these short spoilers? Or maybe does it help to keep dirt from accumulating on the rear window? It seems like I'm seeing this feature more and more lately...

So this isn't actually a homework question, it's a question that was on the test I just took and I cannot figure out what I'm doing wrong. I've tried solving it three or four different ways, double checking everything, and I keep getting ##15 + 3\sqrt {15}## or ~26.6, which was not one of the...

What are the prospects of us having the technology sometime in the second-half of century? I've had this question for some time since I've never tackled actual engineering, but I figured I would ask anyway. Technologists can sometimes sound overly optimistic about things. The likes of...

Hello everyone, I am Abheer and I am a high school student. I wanted to ask that in few sci-fi films I saw hovering cars and now I am wondering, are they really a better alternative than 'wheeled' cars in general (like saving energy being wasted due to friction and also being fast), or are they...

My choice is C, which is "equal to." Here is my reasoning: The engine pulls on car 1, so car 1 is having a force acting on it, which pulls car 1 forward. Likewise, the same amount of force is applied on car 2 by car 1 by moving forward with the same amount of force from the beginning. So it is...

Mercedes CLA has Cd =0.22(180 Blue Efficiency) and Cd=0.23(180). CLS C218 has 0.26, but CLS has wide tires, no flat bottom and other aero features like CLA. aero features of CLA: https://www.car-engineer.com/mercedes-cla-is-the-most-aerodynamic-production-car-of-the-world/ If we compare just...

Why don't cars use something like a rail gun instead of combustion to drive pistons?

[Mentor Note -- thread moved from the technical forums to the schoolwork forums] I have a hollow-cylinder wheel model, braked with brake pads located at a distance d of the wheel's center axis. The brake pads have a contact area S. They are also forced towards the wheel with a pressure p. The...

Two cars A, B move in the same direction with the constant speeds v, u (v < u) on a rectilinear OM circuit, specially built for Formula 1 cars. Assuming that at the initial moment (t = 0), the two cars are on the starting line O (x = 0) of the OM circuit and that, during t, the cars A, B travel...

The car that accelerates must enter according to the equation below the external force, while such an external force does not seem to exist. The force of friction between the car and the road is in the opposite direction of motion ؟

Hi Geniuses... I joined this group because I have a question I can't answer myself. This is about cars. We're all familiar with classic cars having a grill up front and a space right after it, and then usually a radiator to cool the water/coolant in the engine. The discussion we're having in a...

What is power of EMF radiation inside of electric cars? What is frequency range, ELF?

In recent years, I found that many cars, I don't know if their headlamps are original or customized, the light is very bright or sharp, sometimes causing me to see temporary shadow in the eye like camera flash or even a little bit faint. In addition to yellow and white light there are also many...

Around the corner how a differential steering works 1975 ! Engineering Books Join our group : https://www.facebook.com/groups/2373375319542186/

Land Yacht racing has been around for awhile - https://en.wikipedia.org/wiki/Land_sailing a few people still trying it out The question, is has anyone seen ideas of sail-boating applied to semi-trucks, trains, even cars to improve energy efficiency? Another application - has anyone seen...

What came to my mind for this question is: Consider one of the cars. The velocity and mass of this car are V and M respectively. And the velocity and mass of the piece attached to the car are m, v respectively. Before the collision, the velocity of this piece relative to this car is zero. So its...

An electric car has, say, a 50 kWhr battery. 1. How much electricity, in kWhr, is needed to add 1 kWhr of stored electricity to the battery? 2. After several years, the battery capacity has, say, fallen to 25 kWhr. How much electricity, in kWhr, is now needed to add 1 kWhr of stored...

so the question is this. 2 cars with the same mass hits each other at the speed of 30 miles. at which speed a car needs to hit a wall in order to get set same impect? i don't care what Will hurt the driver more. thanks!

It's been a year since I was issued my driving licence. I have never driven automatic transmission cars, so my idea about them is very faint. I know that there is no clutch pedal, and one doesn't have to shift gears while driving forward - that's it. Last day, I was watching a TV show where...

Since the mass of both vehicles is the same, it's possible to calculate Ki which happens to be 512,5J and from there, multiply it by 0,25 since 75% of the energy is gone and I end up with 128,125J. Now my problem is that for the velocity, I have: 25,0 + -20,0 = V1 + V2 which is 5,00 = V1 + V2...

Hi All, I am helping a student (9th grader) develop a research topic related to his interests in physics for an independent study program he is applying for at our school. My background is Geology, so I am not too knowledgeable regarding topics in physics. This student is interested in...

I just saw a video about an electric car which has an ECO mode. In ECO mode the car has less power. So let's say in normal mode the car has 100 kW and in ECO mode 60 kW. But why should the range of the car be greater if it has less power? Because as far as I know to reach a speed of v it...

QUESTION: ----------- For the purposes of this problem, we will define the direction of Vehicle A's initial velocity as the positive direction: While driving on a road that is inclined at an angle of 10 degrees above the horizontal, Vehicle A and Vehicle B are in a head-on collision lasting...

Well, I considered the two wheels as two different bodies and I wrote Newton's equations for both of them I considered the wheel closer to the centre of the circle, we have: ##\mu N_1 =mR\dot (\theta)## So we can find ##N_1## Doing the same thing, we can find ##N_2## ##\mu N_2 =m(R+d)...

I was wondering if electric could be use to boil the water to power a steam car for modern use ?? Also why haven't steam cars being developed more for the 2020's?

What's the technology used by the small devices that can jump start cars? Is it batteries? - capacitors? Fuel cells?

I have been thinking about electric cars from an engineering point of view. I came to the conclusion that they are not worth it, for a number of reasons I will list below. What do you guys think? 1) Energy to charge the batteries must come from somewhere. If the source of the energy is nuclear...

I have a question about battery cars. in our common household electrical appliances like the Fan, light i.e. gadgets having regulator attached to it consumes the same amount of energy whether in full power or at the lowest. Because the extra power will be channelled through resistance inside the...

I think my approach is quite wrong, still I gave it a shot: First I know that ##v_A=13.3 m/s=r\omega=60\omega \rightarrow \omega=0.2 \frac{rad}{s}## Then $$\vec a_A=-r\omega^2 e_r=-2.4 e_r$$ But ##e_r=\cos{\theta}i+\sin{\theta}j## and substituing the latter in the acceleration equation I have...

Hi, I found a programming problem that calculated the speed between two cars as below and I would like to know how the calculation is done. it is about determining the speed of two cars. The coordinate reference system (y,x) is attached to the ego vehicle (as shown in the attached figure). The...

Could electric cars be given longer range by radioisotope thermoelectric generators like they use to power spacecraft in deep space?

The recent 737 tragedies have shown us, I think, a few pointers about automation of planes. Of course, investigation is ongoing but my understanding is that the input from a faulty angle-of-attack sensor and an automated system which the pilots couldn’t switch off contributed. Two worries here...

Homework Statement In a convoy on a long straight level road, 50 identical cars are at rest in a queue at equal separation ## 10 m ## from each other. Engine of a car can provide a constant acceleration of ##2 m/s^2##. And brakes can provide a maximum deceleration of ##4m/s^2##. When an order...

Homework Statement In a short time dt, the probability that a car passes an observer is dt/τ. In a random time interval of length T, what is the probability P(n) that exactly n cars pass the observer? The Attempt at a Solution I can only see how to find P(0) the probability that no cars pass...

Homework Statement The question is from Fundamental Physics 10th Edition, Walker Resnik Holiday: A banked circular highway curve is designed for traffic moving at 60 km/h. The radius of the curve is 200 m. Traffic is moving along the highway at 40 km/h on a rainy day.What is the minimum...

Homework Statement We have two cars moving like the picture. we want to find their minimum distance using relative motion. I) Consider a coordinate system on M, which has two axis. one axis is in direction of MP and the other is perpendicular to that (Something like r_hat and θ_hat). Find the...

Homework Statement Two cars are facing each other on a long straight airport runway. They are initially separated by a distance of 1 km. Car A begins to accelerate towards the other car at a uniform 0.5 ms^-2. Ten seconds later car B begins to move towards the other car with a uniform...

I read an article where the author tried to find the maximal speed a car can have when taking a turn of certain radius. They represented the car as a point and claimed that the force of friction is the centripetal force - acting perpendicular to the trajectory of the car. I do understand why...

<Moderator's note: advertisement link removed.> So I was making a research and would highly appreciate your help. I am making a research about car magnets as to how it is being made, materials, etc. any additional information from you would highly be appreciated...

I need to make the design of car floatation devices. In my case, the airbag/raft is for floating the car in case of floods. I am considering to use Sodium Azide, just like in car airbags, but it inflates very fast and shrinks in a short time. Is there any other chemical reaction that can produce...

Help me please:) (1) An idealized engine with constant torque curve means constant acceleration. So for example if there is no air resistance and no frictions and car is on fixed gear and at 3000Rpm it produces 50Hp so at 6000Rpm will produce 100Hp. So he doubles the speed , doubles power and...

Homework Statement A car of 800 kg was going towards east with a velocity of 36km/h and an another car of 1600 kg was going towards west with a velocity of 54km/h. After collision, in which direction and with how much velocity will the cars go? Homework Equations $m_1u_1+m_2u_2 = (m_1+m_2)v$...

If everything is made of atoms, and if atoms have so much empty space inside them - and if the building blocks of atoms are made up of wave-like particles that aren't solid (strictly speaking) - then why do cars crash and billiard balls bounce off each other, as opposed to passing through each...

Hi, I'm currently in High school so I'm uncertain whether this could be feasibly possible. I read on another thread that Wind Turbine's produce too much drag to actually be beneficial to your car and energy. BUT, they all discussed the wind turbine being on the top of the car. I was thinking...

My parents were driving over the weekend with the windows open and I came up with another bunch of questions. With the windows open, would you use more gas than with them closed? I figured that when the windows are open and wind is blowing in, the wind is pushing in the opposite direction that...