Vehicle Definition and 396 Threads

Homework Statement You are standing on the side of the Trans-Canada Highway as the Physicsmobile approaches you. As it approaches, you hear an engine noise of 1100 Hz. After it passes, you hear an engine noise of 950 Hz. How fast was the Physicsmobile travelling? Homework Equations...

If a moving vehicle (van) had a 10cm diameter aperture in the bodywork at the front, which forms the mouth of a sealed container within the vehicle, would the drag experienced by the vehicle increase in proportion to the size of the sealed container? In other words, would it matter if the sealed...

The project requires me to build an Egg-Drop Vehicle that is ranked based on volume*mass (So ligher/smaller is better). And, of course, the egg can't break when dropped from 20 meters. critique my design please: http://img138.imageshack.us/img138/8872/eggdrop2.jpg Any suggestions or...

Homework Statement A vehicle accelerates from 2 m/s to 26 m/s in 12 seconds. Determine the acceleration. Also find the average velocity and the distance travelled. Homework Equations Average velocity = Total distance/ time taken The Attempt at a Solution Acceleration = (26-2)/12...

Homework Statement A pick up truck is traveling at 58 km/h on a dry horizontal concrete surface when the driver applies the brakes locking the wheels. (a) How far does the car travel before coming to rest? (b) How long does it take the car to stop after the driver applies the brakes? (c) How...

Hello everyone, first post on this forum and I'm really excited to hear you feed back. For my first year engineering design course I'm asked to design a vehicle that will undergo a hairpin turn (180 degrees) around a 2 by 4 piece of wood. The vehicle must only harness the power of elastics or...

I need to design a a vehicle using only elastics and/or balloons as a source of energy, and the cost of the overall material must not exceed $20. Now, I am not asking you guys to do the work for me, but I need ideas because there is a catch. The vehicle must do a hairpin turn at a certain point...

Hi : I am new here but have been thinking about this for a while. I am attaching a drawing to hopefully explain my idea. I think a crossflow fan mounted at the rear of the vehicle's roof ( Accross the width of the car's roof ) , protruding partially above it and setup to allow air flow through...

Having a little trouble with this latest advanced egg drop assignment. The main assignment has two parts - 1. Create a rocket that can reach a minimum height of 120 ft 2. Create a vehicle that can land with an egg for a passenger, and not have it crack. We also aren't allowed to use...

I am working on an SAE Baja vehicle for a competition as part of my coursework requirements. Right now I am trying to come up with a method to estimate the forces that the frame will be subjected to. I need help doing this. I know that the top speed will be 30mph and that the vehicle will weigh...

When you are in a particular gear (say 2nd) , you can vary the speed of vehicle. So what actually is varied in the system as you are not changing the gear, iis it the amount of charge or rpm of the engine is varied to increase speed in a particular gear? Also while changing gears, does the...

Homework Statement On Land, a 5000kg amphibious vehicle can accelerate from rest to 10 m/s in 25 sec. Find... a)Final Kinetic Energy? -250,000 b)Avg Power furnished by engine during acceleration? -10,000 c)If the same power is required to propel the vehicle through water at a...

Homework Statement The coefficient of friction is .48. The brakes are applied to a 1.05 x10^3 car traveling at 95km/hr. How far does the car move before it stops ? How long does it take for the car to stop? Homework Equations Fg = Fn, Fa= u x Fn, a=Fa/m, d=Vf^2-Vi^2/2a, t=d/v The...

Homework Statement Hi, I'm hari. I'm doing final yr B.E. I'm trying to do the headlight automation in automobiles. bt i dono by which device i can do it efficiently?? in my project i wan to sense the light and if the amount of light exceeds the particular value the vehicle wants to dim the...

Given the following instantaneous parameters and constants... Known: d = air density = 1.24 Cr = rolling resistance coeffecient = 0.015 FA = frontal area = 1.48 Cd = drag coefficient = 0.29F G = gravity (mps2) = 9.80665 pi = 3.1415926 m = vehicle mass (Kg) = 1542 DL = drivetrain loss = .2 V...

Hey I was watching a TV show called QI on BBC and there was a question which went along the lines of: If you weight a lorry full of chickens. Then all the chickens jump off the ground at the same instant, in that lorry, the lorry doesn't loose any weight. Then it went on to say, if the lorry...

I'm doing a project regarding weight of vehicle. So we are taking reading of the weight of each of the wheel of the vehicle. So is there any formula to calculate the weigh of the vehicle that has 4 wheel. For Instance, wheel 1 = x kg and so on and so forth

Given: I understand that there would have to be the equivalent energy source to drive the pump. That I will look to later (my gut says the real issue), but for the purposes of this discussion, assume endless power from a source of electricity or hydraulic pressure/flow, and you have to build a...

Homework Statement a toy which have a shape of tank (military vehicle) has a platform of 192mm long, 140mm wide, weight of 2075grams. The canon is 239mm long, 50mm wide, and weight of 400grams. the canon is on top of the platform and being assembled 58mm from the front side of platform. where...

A friend posed this question to me tonight. If a vehicle hits a stationary object and you know the distance traveled of the object, the weight of the object, the model of the vehicle and that conditions were dry on a tarmac road, is it possible to work out the speed of the vehicle on impact?

Hello everybody, Im trying to model a system made by a suspension and a tire for a vehicle simulator written in c#. I modeled both the suspension and the tire as a spring and a damper. So the model is formed by a spring and a damper in parallel (the suspension) in series with another spring...

Apparently aluminium has the highest energy density per unit volume of any material. It can be smelted from ore or recycled oxide using green electricity. People have made batteries using aluminium but they have problems like getting gunked up with Aluminium hydroxide etc. How about burning...

Hi all, this is my first post on Physics forums so I apologise in advance if I have posted in the wrong section etc. This is something that I have been trying to figure out for nearly a week now! I have modeled a vehicle in Solidworks, specifically an external roll cage, and hope to conduct a...

Hi all, I am trying to create a vehicle simulation and get the vehicle to accelerate realistically by calculating the wheel speed in rad/sec. I know the torques and masses of a real world vehicle and I have video showing how fast it accelerates, so i want to recreate that. I have...

Hi all. I didn't get it cleared although i tried searching the internet. 1) Firstly, how does a vehicle gets off...i mean how the torque is converted into propelling force. I don't want to know the mechanism, gears etc...i want to know the physics... 2) Another question is that whether...

Recently I began to think somehin which has led to a lot more questions. If traveling on a straight line and I were to flip a coin a stock standard right handed triangle would be made, due to the coin going up and down. What would the vector diagram look like if the vehicle was to be...

Please help, A vehicle enters a test section of straight road at s = 0 with a speed of 50 km/h. It then undergoes an acceleration which varies with displacement as shown. Determine the velocity v of the vehicle as it passes the position s = 0.30 km. Thanks!

Hello, Just to check if anyone is able to help on this: As we generally know, lateral force on vehicle is also more commonly known as cornering force. In a situation where all external parameters are kept constant, i.e road temperature, road surface friction coefficient, same exact tire...

I hope I'm not asking too much. Other Driver hit Family Member. I want to calculate how fast OD was going. Desired results would be accurate to within 5 MPH or less. OD was in a 2003 Hyundai Elantra; googled curb weight around 2700. FM was in a 2005 Nissan Titan; googled curb weight...

Mousetrap vehicle (please reply today!) My first post :) Hi everyone! I'm in Science Olympiad working on mousetrap vehicle, but there's a problem... My lever arm is as long as I can make it that the vehicle can support so I can even attempt to go the entire ten meters but it goes down WAY too...

Hey, could anyone explain how you would preform a sinusoidal test on large vehicle (weight>40 tons). I have a graph from sinusoidal data, but i don't understant how they were able to obtain this information because there is not a powerful enough testing device.

Hi ! First at all thanks for read, I'm new in the forum ... So the problem is, I would calculate the drag coeff of a car but in the coeff formula I would like to know which AREA is considered for this. drag coeff is given by = 2F / ρ(V^2) A Where : F is the drag force ρ is the mass...

I am struggling on solving a car crash question. Could anyone help me out? Statement: Car 1 (C1) weighs 3,000kg, C2 weighs 12,00kg. C1 was at rest and hit by C2 from side. Both vehicles moved 4m in 1 second before total rest. In other words, C1 was pushed away from side for 4m and C2...

Hi All, It's been a looong time since I've had to use/apply basic physics but I'm hoping I've come to the right place for help. I am trying to help my brother-in-law with a speeding charge. First question The police allege he reached 100km/h within 38m of a corner. The first...

Homework Statement I'm trying to find the force exerted by a 500 GPH (gallons per hour) submersible bilge pump. My team is designing a submersible vehicle for our university course. The vehicle is only supposed to move up and down in the vertical direction; basically it should just be able...

I must design a lunar roving vehicle. One of the criteria is that the electric power cannot exceed 9 volts. My teacher said that is I have 2 batteries powering the front wheels separately then the power remains at 9 volts and not at 18 volts. Is this true? Thanks!

I'm building a Battle-Bot, and I need areliable power scorce. I have multiple AC motors, but will require a DC power scorce. Anyone know a good battery? I've already heard that a motercycle battery might be the way to go, I'm just looking for cheap alternatives. Also, please keep in mind that...

Homework Statement I working on this for a high school thesis. I am trying to find the power required to move a 7100 lb vehicle over a variety of scenarios, but am having trouble calculating the force of tractive resistance. Homework Equations I found what i thought was a pretty...

I have been playing with several vehicle dynamics simulators for a while now, and many of them require vehicle inertial properties to create realistic simulations. There is very limited published data out there so I was wondering how could one calculate these properties experimentally...

Hello all...I have a led project I have been doing in my vehicle...I have a Bose/Clarion radio that has blown incandescent bulbs. I have already done the instrument cluster & climate control with drop-in led's so I decided to try & fix the radio. My problem is that the radio has soldered in...

i could use some help with a question: if one realizes that one is about to have a head on collision with a car equal to ones own vehicle, is it better for one to speed up on the theory that the harder i hit him the less it hurts me, or is it better to slam on brakes to lessen the impact? i...

Hello Everyone I am currently studying the inductive loop detectors used in the traffic control department. I believe the data from the detectors is highly unreliable and noisy. A lot of research has been going on on the 'Fault detecting algorithm' and other means to improve the accuracy of...

I'm trying to calculate skin friction drag on a truck so I can compare it to pressure drag. I can find the formula and typical coefficients for pressure drag easily enough but I've had a hard time finding it for skin friction. So far I've found this...

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)

This thread is for MATH regarding wind powered vehicles. I don't want to see your opinion. I want facts and math. PERIOD This is my (attempted) derivation of what a wind powered car is capable of. I may have accidentally derived an infinite energy machine, so if someone would check my work...

Some may already be aware of this but I discovered it for the first time today- http://www.spaceref.com/news/viewsr.html?pid=36068 http://en.wikipedia.org/wiki/Nautilus-X Looks like they may be testing the centrifuge on the ISS some time in 2013.

I'm studying the chapter 'Steady State Cornering', from the book 'Fundamentals of Vehicle Dynamics' (by Gillespie). The concept of a 'roll center' seems to be very important here, especially after the 'roll axis' is defined (line joining the front and rear roll centers). But I don't...

I am recreating a car accident, an inelastic collision. The two vehicles after the collision have an initial velocity of 21.69m/s. They skid 6m across asphalt with coefficient of friction value of 0.72. They then pass through 0.5m of gravel with a coefficient of friction value of 0.4. Finally...

I need to power three 5 volt devices off a vehicle 12 volt axillary power. Each device draws 1.5A, 500 mA, and 750 mA. Would the vehicle 12 volt axillary power provide enough current for this? If so, what parts and configuration would I need to accomplish this? Thanks

I purchased a used vehicle. When I bought it the CPU had been reset and I was unable to get it smogged (emissions tested). When the CPU finished its cycles I got it tested and it failed. Mechanic said I should replace the EGR Valve and the 1st O2 sensor. I did so and it failed again. Then...