Car Definition and 999 Threads

Homework Statement The car circulates on a section of road whose profile can be approximated by a sinusoidal curve with the wavelength of 5.0 m. The mass of the car is 600.0 kg, and each wheel is equipped with a constant spring k = 5000 Nm-1 and a damper with constant b = 450 Nm-1s. Calculate...

Homework Statement An extra-curricular theoretical assignment I have received: A car is traveling on a completely flat/uniform straight road at a constant velocity on a clear, dry day. 100 meters ahead, underneath the road there is a roller (similar to a rolling-road) which can spin without...

I have few (more or less) general questions: 1. I know that: "The coefficients of friction are nearly independent of the area of contact between the surfaces". I understand this, but I know from everyday life, when car tire tread is worn off, braking distance increases and maximum acceleration...

Homework Statement A man of Mass M stands on a railroad car that is rounding an unbanked turn of radius R at speed v. His center of mass is height L above the car, and his feet are distance d apart. The man is facing the direction of motion. How much weight is on each of his feet. Homework...

Today I've come across the statement that the coefficient of static friction of rubber tires on asphalt is bigger than that of tires on concrete. Does it mean that the maximal acceleration a car can attain on asphalt will be greater than that on concrete? My assumptions: 1)The force of friction...

I am currently engineering my v2 version of my f1 in schools car, it is a small scale car powered by a CO2 cartridge designed to go down a 25m track, my current version does 25m in under 1.4s, however, I would like to shave off another 0.3-0.2s I believe my main issues are the bearings (only...

I'm no physics major... And I have no formal education... I just have a task that I wonder if could be possible... Could a feather lift a car? Could you use the weight of a feather and the proper lever system or systems to lift a standard sized car off the ground?

Hello, I am someone who has no experience in physics other than primary/high school and I have a quick simple question about something I can't wrap my mind around as a complete physics newbie. Please have understanding. The question: let's say a train is standing still at a point in space (so...

Hi All, I've been asked to re-work the below as my original method was incorrect. Below is my second attempt on the question, which I would appreciate some input from someone a more knowledgeable than myself. Thanks, 1. Homework Statement A racing car of mass 850 kg accelerates from 20...

I'm currently working part-time as a secret shopper this summer and have come across these jobs where you have to drive relatively far. The distance can be anywhere from 25 to 60 miles (on average, but possibly more if you want certain jobs). Pay is negotiable. This is what makes it...

So I recently learned that Teslas use AC induction motors rather than DC motors. Now I always assumed that DC motors would be easier to control the speeds of vs. induction motors, so it surprised me that they used an induction motor in the Teslas. Now in my old days I had heard that induction...

Homework Statement The volume displacement in a car engine is 2000 cm3. During the power stroke, the mean pressure inside the cylinder is 15 bar. Compute the work performed by the engine in one revolution. Compute the engine's power assuming it runs at 3000 rpm. Homework Equations...

I want to strap an estes b4-4 rocket to a toy car and calculate how far it would travel. What I know: Mass of car: 300 grams Rocket nominal force: 12.8 Newtons I think this means the rocket would accelerate my car for a=F/m = 12.8 kg * m/s^2 / 0.300 Kg which means 12.8 m/s^2/ 0.3 = 42.67...

I have to make a project for school, so I thought that i can make a static electricity car. I wanted to make a car, and stick/put a material behind the car which creates a charge, and then take another material which creates a charge, and rub it. As it creates static electricity, the cars...

Attached is a picture of my set-up. It is very simple and if for a car (12V) The LED kit comes with 3 options: Hard wire install, cigarette lighter install, and 9 + 9 V battery demo. The peculiar thing is when I connect the hard wire install plug (shown at the top of the picture) to a...

Hi all, I am currently self teaching physics and have come across something i don't know how to do. There are 2 cars, Cars 1 and 2, traveling at a velocity of 60km/h (16.67m/s) in the eastern direction with a gap of 5 metres between each other. Car 2 is in front of Car 1. Car 2 decelerates to...

We have a car accelerating at a uniform rate ## a ## and a pendulum of length ## l ## hanging from the ceiling ,inclined at an angle ## \phi ## to the vertical . I need to find ##\omega## for small oscillations. From the Lagrangian and Euler-Lagrange equations, the equation of motion is given...

I am reviewing angle of elevation and depression. I came across this "tricky" problem. A car is traveling on a level road toward a mountain 2 Km high. The angle of elevation from the car to the top of the mountain changes from 6 degrees to 15 degrees. How far has the car traveled? What is the...

Homework Statement Homework Equations ##E_{\operatorname{total}}=E_{kin}+E_g## ##F_{net}=F_N+F_g## ##a=\frac{v^2}{r}## The Attempt at a Solution I've already technically completed question 4 part c, getting an answer of 8168 N downwards (which is what the answers say). However, this is...

Homework Statement consider a 3300 lb car whose speed is increased by 35 mph over a distance of 200 ft while traveling up a rectilinear incline with a 15% grade. model the car as a particle, assume the tires do not slip, neglect all sources of frictional losses and drag. find the work done by...

Homework Statement A car driving at a speed of 60km/h at a horizontal road. The car accelerates to 65km/h, and then the engine gets deactivated. The speed then decreases to 55km/h in a time of 7,2 seconds. The mass of the car is 1450 kg(the car, passenger etc...) Homework Equations What is the...

[Mod note: Thread moved from General Discussion forum, so no homework template is shown] So - I've no idea where to write this but... I was looking at this post : https://www.physicsforums.com/threads/car-rolling-down-a-hill.302812/ And started to answer it as it was similar to some stuff...

Problem : A car of mass ##m## is parked on a slope. What does static friction ##\mu_s## have to be for the car not to slide down if the incline of the hill is ##30## degrees? ******* For this problem I have the following forces, where the hill is inclined upwards to the right: Upwards ...

There's a pendulum attached to a car accelerating with ##A##. I know I can find it's time period using the "effective" g method, but I want to find it from first principles. My attempt: ##tan\theta = A/g## Now I displace it by ##\alpha## giving ##mgsin(\theta+\alpha)-mAcos(\theta+\alpha) = ma##...

i just had curiosity when i saw car magazine about http://www.roadandtrack.com/new-cars/videos/a18350/lithium-batteries-not-just-for-hybrids/ What is the first car model using li-ion battery in their starter motor..? Is it Porche's track-oriented models?

Homework Statement The problem: Here is an approximate reaction for burning hydrocarbons in air: (CH2)n + 1.5*n O2 + 6n N2 -> n CO2 + n H2O + 6n N2 (n is an integer) The (CH2)n approximates the fuel, and everything on the right is the exhaust. The atomic masses of hydrogen, carbon, nitrogen...

So, at a car rental company, 20% of car reservations are not claimed. There is a total of 22 cars and the manager takes 25 reservations a day. If all cars are claimed for a day, what is the probability that one or more customer who had reservations were unable to claim their car? I need to...

Greetings, It's been quite a while since I had to do anything with velocity, friction, mass, and practically any physics over simple calculations. My car was hit yesterday while parked. There were no injuries, and it still drives just fine. The collision was hard enough to deploy the other...

Homework Statement We have that a police car is traveling at ##26.4## m/s, and that at a time, ##t=0##, a car speeds by at ##37.5## m/s. After ##1## s, the police car accelerates constantly at ##2## m/s2. We are asked to find the time, ##t##, where the police car catches the speeder. Homework...

Hi guys, I'm working on a project where I need to find the torque produced by the rear wheels of an RC car so that I can convert it into power and then into the current required by the motor. So T=ω×Pmech → Pmech → Pelec → Imotor Here are the details for the car: 1kg weight Torque on each rear...

Hello folks I'm worried something wrong is going or may be I'm way too concerned about it as I had studied science after my 12th grade. But People here in gulf selling car silencers Mud. The Mud gathered in Cars silencer filters are sold at very high prices I have heard that the Mud or...

we all know that some cars are lemons and some are great. but sometimes we can get 2 identical cars, bought, driven and serviced the same, but 1 is great and the other will be a lemon. how this happens sometimes baffles me. does anyone have any plausible theories?

Homework Statement why does the spinning of wheels move a car? Homework EquationsThe Attempt at a Solution The wheels spin backwards pushing on the road, friction opposes this spinning motion. But why does this result in the car moving forward? friction can only increase to be equal and...

Hi I'm very new to this so bear with me lol. I'm trying to plan out a project for building a diesel powered car and I want to use an of the shelf pneumatic starter for novelty but I don't know how much volume I need. So the starter requires 120 psi @500scfm. My idea is to use scuba tanks or...

Homework Statement A small car with mass .800 kg travels at a constant speed of 12m/s on the inside of a track that is a vertical circle with radius 5.0m. If the normal force exerted by the track on the car when it is at the top of the track is 6.00N, what is the normal force at the bottom of...

Hi Guys, I solved two questions below. Just need some feedback to make sure I solved them correctly. Thanks a bunch. 1. Homework Statement A car of mass 1.4 tonnes (1400 kg) traveling down the highway at 120 km/h has a F air of 1800 N acting against it. What force must be applied by the...

Hello, so for school I'm building a mousetrap with my group for a project, but our car isn't moving. We filmed it snapping, and it doesn't seem like it is because of friction, since the axle spins pretty well. We thought that it was because the thing that holds the axle bends, but after fixing...

Homework Statement A small toy car slides down an elaborate track. At one point during this trip, the car will go around a vertical loop with radius 15cm as shown. What is the minimum speed the car must have at the bottom of the loop in order to make it all the way around the loop without...

Homework Statement I know this is long, but that is only because this question requires me to be thorough, conceptually I think it isn't difficult. To make it easier to read I bolded the important parts. In Physics lab, we were told to conduct an experiment to investigate the effect off mass...

Looking for some calculations help, if someone wouldn't mind. I'm trying to figure out what simple formula I might use to estimate how fast a car would have to be going to throw a 50lb object 38 feet. All of the formulas I've found take into account other factors such as friction. I am just...

Homework Statement This is the problem http://imgur.com/a/1XFlt 2. Homework Equations This is the given FBD http://imgur.com/a/CURqA 3. The Attempt at a Solution Now the car should have a tendency to slip down the ramp thus causing the frictional force to oppose this motion. But the...

Hey! I'm conducting an experiment wherein a car of various weights travels down an inclined plane of varying angles, attached to the back of the car and the top of the ramp is an elastic cord. Once the car reaches the end the elastic pulls backward, and thus pulling the car back. We are...

I have to create a vehicle to safely transport an egg from a ramp 1 m above the floor. The car must be powered solely with gravitational potential energy, must fall and land of its wheels, and I get a better grade for the farther away it lands from the ramp... but I'm completely lost of how to...

Homework Statement A car is on a ramp of angle theta with the horizontal with the front of the car pointing up the ramp. Its weight distribution is uneven so that more of its weight is towards the rear of the car therefore the center of mass is closer to the rear of the car. The car is very...

This is only a semi- serious thread, since I suspect there's a simple back-of-a-napkin calculation that shows this to be infeasible. The idea is the following: a lot of a car's efficiency gets lost in the form of air drag, I.e. forcing the air to go around the car. Could one upscale a...

I've been trying to study for my final and I can't seem to figure out how is this suppose to work. 1. Homework Statement A wall (m infinite, v=0) hits a car (m=2600 kg; v=142 km/h). The car becomes deformed and the crush zone (0.7 m) is compressed. Calculate the corresponding acceleration...

Homework Statement A train has got five train cars, each one with N seats. There are 150 passengers who randomly choose one of the cars. What is the probability that everyone will get a seat? I think that what is asking me is "what is the probability that each wagon is chosen by no more than...

Homework Statement For the first half of a trip a car has velocity v1; for the second half of a trip it has velocity v2. What is the mean velocity of the car? (The book does not mention a direction.) Homework Equations Arithmetic mean: $$\frac{v_{1}+v_{2}}{2}$$ Harmonic mean...

I have a 1968 Mustang that I bought at auction from my grandfather's estate it is almost completely apart and I want to rebuild it for him has sadly he ran out of time, I have a reproduction manual from 1968 with frame dimensions in it and some of the dimensions car vertical to a datum line. I...

Homework Statement http://imgur.com/a/IYbP1 A Car sitting on a frame with an attached bar pressing down on the hinged section (Orange). A hinged section coming off the frame with a wheel attached (Blue) How to calculate the radial force on the wheel bearing at 1m away from centre of engine...