What is Automobile: Definition and 90 Discussions

A car (or automobile) is a wheeled motor vehicle used for transportation. Most definitions of cars say that they run primarily on roads, seat one to eight people, have four wheels, and mainly transport people rather than goods.Cars came into global use during the 20th century, and developed economies depend on them. The year 1886 is regarded as the birth year of the modern car when German inventor Karl Benz patented his Benz Patent-Motorwagen. Cars became widely available in the early 20th century. One of the first cars accessible to the masses was the 1908 Model T, an American car manufactured by the Ford Motor Company. Cars were rapidly adopted in the US, where they replaced animal-drawn carriages and carts, but took much longer to be accepted in Western Europe and other parts of the world.Cars have controls for driving, parking, passenger comfort, and a variety of lights. Over the decades, additional features and controls have been added to vehicles, making them progressively more complex, but also more reliable and easier to operate. These include rear-reversing cameras, air conditioning, navigation systems, and in-car entertainment. Most cars in use in the early 2020s are propelled by an internal combustion engine, fueled by the combustion of fossil fuels. Electric cars, which were invented early in the history of the car, became commercially available in the 2000s and are predicted to cost less to buy than gasoline cars before 2025. The transition from fossil fuels to electric cars features prominently in most climate change mitigation scenarios, such as Project Drawdown's 100 actionable solutions for climate change.There are costs and benefits to car use. The costs to the individual include acquiring the vehicle, interest payments (if the car is financed), repairs and maintenance, fuel, depreciation, driving time, parking fees, taxes, and insurance. The costs to society include maintaining roads, land use, road congestion, air pollution, public health, healthcare, and disposing of the vehicle at the end of its life. Traffic collisions are the largest cause of injury-related deaths worldwide.Personal benefits include on-demand transportation, mobility, independence, and convenience. Societal benefits include economic benefits, such as job and wealth creation from the automotive industry, transportation provision, societal well-being from leisure and travel opportunities, and revenue generation from taxes. People's ability to move flexibly from place to place has far-reaching implications for the nature of societies. There are around 1 billion cars in use worldwide. Car usage is increasing rapidly, especially in China, India and other newly industrialized countries.

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  1. I

    How Does Wheel Base and Center of Gravity Affect a Car's Maximum Acceleration?

    A motor car with wheel base 275 cm with a centre of gravity 85 cm above the ground and 115 cm behind the front axle has a coefficient of adhesion 0.6 between the tyre and the gound, Calculate the maximum possible acceleration when the vehicle, is (a) driven on four wheels, (b) driven on the...
  2. G

    First Law of Thermodynamics and automobile

    Homework Statement An automobile battery that is originally fully charged gradually discharges while sitting on a shelf at a constant temperature of 40C, producing no electric work but resulting in a heat transfer of 1000kJ to its enviroment. The battery is then recharged to its initial...
  3. S

    Automobile Hydrostatic Pressure

    Homework Statement 1) A typical automobile tire has a gauge pressure of around 30 Ib/in^2. How much is that in pascals? If a car weighs 8897N(=2000lb), how much area(SI units) on each tire is in contact with the road? 2) A swimming pool 5m wide by 10m long is filled to a depth of 3m...
  4. M

    What are the different types of power losses in a car engine?

    Hello, i would like to know in what ways power is loss from a car engine to the wheels and what are the percentages of the power losses that occur. Do the power losses vary with engine speeds? Also, how much power does the electric motor starter consume? Max90
  5. R

    Everybody builds a cars or automobile as project

    Hi guys I am in a big problem. I have to make a final year project. Although am interested in automobiles(cars) and have real talent in deigning their exterior. But my friends say everybody builds a cars or automobile as project ... make something different. What should i make? I thought i...
  6. J

    Using Solenoids to Create an Automobile Engine: Patents & Possibilities

    I once saw an engine study that uses solenoids in compensating engagements much like the internal combustion engine. It was a small contraption but it worked. It used 12v dc current. I am just wondering if the engine can produce enough electricity to recharge the battery it uses if an alternator...
  7. M

    Automobile collision force problem

    seat belts and airbags save lives by reducing the forces exerted on the driver and passengers in an automobile collision. cars are designed with a crumple zone in the front of the car. in the event of a impact, the passenger compartment decelerates over a distance of about 1 m as the front of...
  8. K

    Auto Accident Survival: Airbags & Acceleration Trauma

    The human body can survive an acceleration trauma incident ( sudden stop) if the magnitude of the acceleration is less than If you are in an automobile accident with an initial speed of and you are stopped by an airbag that inflates from the dashboard, over what distance must the airbag stop you...
  9. P

    Automobile collision-speed passenger crashes against dashboard

    Homework Statement In a collision, an automobile initially traveling at 50 km/h decelerates at a constant rate of 200 m/s^2. A passenger not wearing a seat belt crashes against the dashboard. Before the collision, the distance between the passenger and the dashboard was 0.60 m. With what...
  10. P

    Comparing Automobile Fuels: Petroleum vs Diesel vs LPG

    I need to review 6 journal articles (approx. 150 words/article) relating to chemistry of the car (any topic). I need a topic which is going to allow me to easily identify the biases of the people who wrote the article, and that will be somewhat controversial, interesting and relevant to our...
  11. S

    Exploring Options for M.Sc After BE in Automobile Engineering

    Gate, jam,... Omg! Hi. I am from India. I have just completed my BE in Automobile Engineering. But i have no interest in standing on assembly lines and checking whether the carburetor specs are right.. Physics attracts me more. So i have decided to pursue my masters in it rather. What will...
  12. J

    Terminal Voltage automobile storage battery

    Homework Statement The emf of an automobile storage battery is 12.20 V, and its internal resistance is 0.008 ohms. what is the terminal voltage of the battery when the starter motor is drawing 150. A from the battery? Homework Equations N/A The Attempt at a Solution I have no...
  13. R

    Can Automobiles Be Used as Power Generators?

    Most are familiar with dynamometers that measure torque and horsepower output of the automobile drive train. The auto's drive wheels are driven onto a set of rollers and the output of the system is measured at various speeds. I am wondering if an electric power generator could be driven in this...
  14. C

    Circular Motion of an automobile

    Homework Statement This is just a conceptual question: Give an example of a situation in which an automobile driver can have a centripetal acceleration but no tangential acceleration. Homework Equations N/A The Attempt at a Solution I understand that centripetal acceleration...
  15. H

    Centripetal acceleration automobile problem

    Homework Statement 6. A car of mass 1750 kg rounds a circular turn of radius of 21 m. The road is flat and the coefficient of kinetic friction between the tires and the road is 0.3, while the coefficient of static friction is 0.76. How fast can the car go without skidding? Homework...
  16. B

    Direct Current Circuits and automobile battery

    1.An automobile battery has an emf of 12.6 V and an internal resistance of 0.0620 . The headlights together present equivalent resistance 6.00 (assumed constant). What is the potential difference across the headlight bulbs when they are the only load on the battery? What is the potential...
  17. mtworkowski@o

    Are Shock Absorbers the Unsung Heroes of Car Performance?

    I'd like to open a discussion on the ins and outs of shock absorbers on cars. The ability of a device to restrict the extension of the suspension springs works miracles that are not always appreciated.
  18. W

    Do Manual or Automatic Transmissions Offer Better Traction in Snow?

    Hi All, Something has been nagging at me for decades and I feel that this is the place to get the real answer so here goes. The question concerns the difference between manual transmissions and automatic transmissions regarding traction in snow. Now it seems to me that given the same...
  19. J

    Automobile antennas-radial ribs?

    What is the purpose of the spiral ribs seen on modern car radio antennas?
  20. H

    Automobile batteries and internal resistesnce

    Why do automobile batteries have very low internal resistance?
  21. S

    Static Equilibrium of an automobile

    Homework Statement An automobile with a mass of 1360 kg has 3.05 m between the front and rear axles. Its center of gravity is located 1.78 m behind the front axle. With the automobile on level ground, determine the magnitude of the force from the ground on a) each wheel (assuming equal...
  22. A

    Archived Calculating Back EMF of an Automobile Starter Motor

    Homework Statement An automobile starter motor draws a current of 1.9 A from a 5.5 V battery when operating at normal speed. A broken pulley locks the armature in position, and the current increases to 8.6 A. What was the back emf of the motor when operating normally? Answer in units of...
  23. clope023

    How to Calculate Power Requirements for a Truck at Different Speeds

    [SOLVED] Automobile Power Homework Statement A truck engine transmits 28.0kW(37.5hp ) to the driving wheels when the truck is traveling at a constant velocity of magnitude 60.0km/h ( 37.3mi/h) on a level road. a) resistance force? P = Fv, P/v = F = 1680N this is where I have trouble...
  24. A

    Constant Acceleration Automobile

    [SOLVED] Constant Acceleration Homework Statement At the instant the traffic light turns green, an automobile starts with a constant acceleration a of 2.1 m/s^2. At the same instant a truck is 10.2 m down the road and traveling with a constant speed of 8.5 m/s. (a) How far beyond the...
  25. S

    Kinetic energy of moving automobile

    suppose an atomobile has a kinetic energy of 20,000J. If it moves twice as fast, what will be its kinetic energy? three times as fast? i think that if the velocity is 2 times as fast, then the energy will be 2times^2, and if it is 3 times as fast, then it will be 3times^2...is that correct...
  26. K

    Energy content of automobile fuel

    1 litre of petrol contain about 8.79 KWHr (30023 BTU) of energy. A car wieghs about 1500Kg is able to run for about 10000 meters by burning 1 litre of petorl. For moving 1500 Kgs for 10000 meters the energy required is 150 Megajoules which is equal to 41.67 KWHr. How this is possible? Am I...
  27. Andrew Mason

    Automobile energy cost - Dust to Dust report

    Some organization called CNW Marketing Research Inc. has published an "analysis" of the total energy consumption of various kinds of cars. It is called Dust to Dust: The Energy Cost of New Vehicles From Concept to Disposal. This is most certainly not a scientific paper (it refers to...
  28. C

    Optimizing Car Speaker Performance: Understanding Voltage Requirements

    What voltage do car speakers typical run at? Thank you for your time.
  29. M

    Stopping distance of an automobile skidding on dry and wet pavement

    A 1500-kilogram automobile travels at a speed of 90 km/h along a straight concrete highway. Faced with an emergency situation, the driver jams on the brakes , and the car skids to a stop. What will the stopping distance be for (a) dry pavement and (b) wet pavement?
  30. B

    Automobile Centripetal acceleration

    The cornering performance of an automobile is evaluated on a skidpad, where the maximum speed that a car can maintain around a circular path on a dry, flat surface is measured. Then the centripetal acceleration is calculated as a multiple of "g", the free-fall acceleration due to gravity at the...
  31. M

    Automobile Deceleration Problem

    Hey! I have this question that I can't find the answer to anywhere! The Brakes of an automobile can decelerate at 6.00 m/s2. a) How many seconds are required to stop the automobile if it is traveling at a rate of 27.0 m/s? b) How many meters does the automobile travel during this...
  32. R

    Solving an Automobile Cooling System Question: 18L to kg Conversion

    I've got a question to solve.. Just need 1 thing.. An automobile cooling system holds 18L of water. How much heat does it absorb if its temperature rises from 20ºC to 90ºC? I need to find how many kg of water I have... and then plug into Q =mc(T1-T2) Q = (m)(4186)(-70) Look...
  33. S

    How Do Changes in Temperature and Volume Affect Tire Pressure?

    Hi Guys! im having trouble in solving this prob can u tell me the hints as well as the correct answer of this prob: an automobile tire is filled to a gauge pressure of 2000 kPa when it is at an air temperature of 20 degree celsius. After the car has been driven at high speed, the tire...
  34. S

    Designing a Go-Kart: Force, Kinematic Analysis & Accessories

    I am planning to make a go-kart.could someone help me with the design paramaeters?I would like to have a complete idea on the design of the frame (by this i mean to understand the pros n cons of front taper etc used in modern race cars),suspensions etc. I have gone through much of the...
  35. dduardo

    Gentoo Linux PC in a Mazda: Amazing Audio & Automobile Control

    This guy installed a pc with gentoo linux in this mazda: http://www.timekiller.org/carpc/ Things he could do:
  36. zoobyshoe

    Why is my 1989 GMC truck's overheat light coming on after driving for a minute?

    1989 GMC truck 4 cyl 2.5 liter The overheat light comes on after about a minute's driving. I have flushed the system, replaced the hoses, replaced the whole radiator, and the coolant temperature sensor and the thermostat(tried two separate new thermostats). I tried removing the thermostat...
  37. S

    Understanding DC current in automobile electrical systems

    Ok so yesterday, I had to jump start my chevy blazer because I left the dome light on and the battery went dead. once it started, I let it run at high rpms for 8-10 minutes to semi charge the battery before I left. I know it was charging, because my alternator gauge was reading 16, and a fully...
  38. J

    What is the value of the automobile acceleration?

    An Automobile starting from a rest at t=0 undergoes constant acceleration on a staight line. It is observed to pass two marks separated by 64m, first at t=8 and the second at t=12s. What is the value of the acceleration? I know how to find the Vel. from this (64m/4s) but i don't...
  39. A

    Automobile speedometer physics test problem

    Hello anyone that can help. I am trying to gain an understanding of rotational motion, including (tangential speed, angular momentum, centripetal force and so on). The first question I was hoping that someone could help me is: An automobile speedometer is configured yo read speed proportional...
  40. M

    Physics of an automobile, suspension, and weight transfer?

    The application is drag racing in a rear wheel drive vehicle. The vehicle weighs approximately 3000lbs. Traction is not an issue as both vehicles grab the ground perfectly. The front and rear is suspended by a shock and spring in each corner. All else is equal unless otherwise stated...
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