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.
t= v/a
=25.8 m/s / -2.5 m/s^2
=10.1 s
therefore,
d= vi * t + 1/2at^2
= (25.8)(10.1) +1/2(-2.55)(10.1)^2
=131 m
I got the first one right I think, but I don't know how to do b
Hello
This is not a homework, this is my own experiment to understand how the motion works. Please, follow my question here below:
I have a hot wheels race with a slope with 10 degrees where I use a small car which departs from the top to the bottom. I have taken 5 times the time to get an...
Hello Forum,
I am not sure this question really belongs here but I was not sure where else to post...it is about science and health after all. I started thinking about this question seeing so many people have sadly become homeless and living in their cars because of the pandemic and job crisis...
W= Fd
W= 3NX1.20m
W= 3.6 J is the work done by the crane
W=Fd
W=0.6Nx1.20m
W=0.72 J is the work done by the car
I have no idea how to solve the c, I am thinking at first that the work done by the crane and the car are zero because cos 90 is zero and there are perpendicular to each other. I...
Hi everyone
I've just completed a mechanical engineering degree, and one aspect of the classic 2DoF quarter car model that still bugs me is the representation of the tyre as a linear spring attached to the ground.
Does anyone have any experience of modelling the system with the tyre spring...
I do curbside/drive-up pick-up service from various businesses. I order on their app. They pack it and when I arrive to the store, they put it in my trunk. No contact. I never have to roll down my window even.
I let the groceries (non-refrigerated) or retail goods sit in the trunk for a...
I want to change the the old round 5000 series filament bulbs to led. I attached a picture of some I found on Ebay. I see some led bulbs seem to mention some thing about fan. One way would be cut hole in old glass bulb and glue led in with silicon. Could use glass jar and drill hole in cover...
Tesla’s Autopilot a ‘distant second’ to GM’s Super Cruise system in Consumer Reports testing
I think this is very interesting because of Consumer Report's reason for their evaluation.
The GM autopilot aggressively monitors the driver to make sure he/she is alert and paying attention.
The GM...
I usually find new ideas being only useless gadgets. But this, I could go for it, so I'm promoting it.
source: https://www.facebook.com/MarkRoberYouTube/videos/1254798328186209/
I'm a little confused about this question because I think the braking deceleration probably takes into account the braking system of the vehicle as well as the power of the motor. I don't understand how a car could actually brake without the "friction between the mechanical components of the...
Homework Equations
Conservation of energy. Kinetic energy=(1/2)mv^2
The Attempt at a solution
m=1.5*10^3kg, final velocity=25m/s, initial velocity= 11m/s, distance=0.20 and work done=?
What do I do next.
Earth rotate from west to east with 460m/s at equator.
Car travel at equator from east to west at speed 460m/s.
1- What is car speed from inertial ref.frame?
zero?How is zero if car travel in curved line?
2-What is car speed from rotational frame ?
3-How much is car weight,compare to car...
I am looking for a passive way to convert a supply of hot air into warm pool water. My pool can be in the low 70s without heat. Looking to get a 10 degree lift in pool temp. Pool is in-ground and relatively small at 8,500 gal. Water flow rate through the radiators can be regulated by valves...
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!
Equation 1:
Where t1=time spent on motorway
Where t2=time spent on country roads
t1+t2=4
Equation 2:
Using distance = speed * time
200 = 70*t1+40*t2
Rearrange equation 1 in terms of t1;
t1=4-t2
Substitute the rearranged form of equation 1 into equation 2:
200=70(4-t2)+40t2
200=280-70t2+40t2...
Question 1:
So we are given three variables;
Mass=90kg
Angle to the vertical = 20 degrees
Speed = 10 ms^-1
There is not enough information to rearrange the formulas for centripetal force or acceleration in terms of r to find the radius. However, I have a attached a free body diagram of a...
Here is an image of the problem:
The problem consist in finding the moviment equation for the pendulum using Lagrangian and Hamiltonian equations.
I managed to get the equations , which are shown insed the blue box:
Using the hamilton equations, i finally got that the equilibrium angle...
Here is an image of the problem:
The problem consist in finding the moviment equation for the pendulum using Lagrangian and Hamiltonian equations.
I managed to get the equations , which are shown insed the blue box:
Using the hamilton equations, i finally got that the equilibrium angle...
A car moving at constant speed is in uniform circular motion, thus having centripetal acceleration of ##a=\frac{v^2}{R}##. The force associated with this acceleration is known to be friction. But friction, in nature, appears as an opposition to the relative motion between two surfaces whether it...
http://mccabism.blogspot.com/2017/08/curved-flow-and-arrows-a3.html
"The nose skirts on the Lotus 80 and Arrows A3 would have suffered from the fact that a Formula 1 car has to generate its downforce in a state of yaw. Thus, in a cornering condition, a car is subjected to a curved flow-field...
A truck passes a point A on a straight level road with a constant velocity of 10 m s -1. At the same instant, an automobile starts from rest at point A and travels in the same direction as the truck, with a constant acceleration of 1.6 m s -2.
How long a time does the automobile take to pass...
I think that driving at 130-140 km/h a car could dissipate 5-10 kW of energy only because of aerodynamic drag.
Why cars don't have a fan somewhere to exploit the aerodynamic drag?
For example a Pelton turbine
when we have 0 acceleration(constant speed) like a car traveling at a constant speed,
ƒnet=ma
ƒnet=(mobject+mfriction).(aobject+afriction)
let m object be 1500 kg.
m friction be 10 kg
a object be 0
a friction be 20m/s^2
so when we calculate fnet=-20*1600=-32 000 Newtons.
which means wall applies...
At time t=0 , a car moving along the + x -axis passes through x=0 with a constant velocity of magnitude v0 . At some time later, t1 , it starts to slow down. The acceleration of the car as a function of time is given by:
a(t)= 0 0≤t≤t1
-c(t−t1) t1<t2
where c is a positive constants in...
Below is my working out. If you could have a look at my answers and see if they are correct and then advice me on how to improve my solutions for Parts I and II, and how to answer F and G with the given information. Thanks in advance!
Parts aand b are diagrams so please refer to the attached...
Could I please ask for any help with the following question:
Here's my attempt: (i and j are unit vectors in the directions of east and north respectively)
(apologies that LaTeX is simply not working for me, I'll label the angles in each case T and P as shown in my diagram)
Let the...
A car starting from rest picks up at a uniform rate and passes three electric post in succession. The post are spaced 360 m apart along a straight rod. The car takes 10 seconds to travel from the first post to the 2nd post and tales 6 seconds to go from the 2nd post to the 3rd post. Determine...
I currently jack up the end of the ramps using the channel frame and a 3 1/2 ton jack, because of the height of the channel frame I have to have it sitting quite far back under the car for clearance when the ramp is lowered down to drive off.
I have to push the jack a long way under the car to...
θ=90°= π /2 so the instantaneous angular velocity dθ/dt= lim∆ t -> 0 (θ(t + ∆ t)-θ(t))/(∆ t)
When I calculate it out it is π /2 radians per second. Is this correct?
Hi guys,
i hope i find the right Sub-Forum. Can you please tell me if i calculated it right.
A car speed's up with 5 m/s² to a speed limit of 50Km/h. After it arrived the speedlimit it drives for 30s with the speed of 50km/h. After that it break with a negative acceleration 3.0m/s² to stop...
"A man of mass M stands on a railroad car which 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?"
I came five equations, and...
1. When a car turns there is a centripetal force towards the centre. This centripetal force is labelled as a static frictional force. I don't understand where this static frictional force arises from. Friction is meant to oppose motion, but I don't see the motion that is parallel to the friction...
I understand that the weight of the car does not change (assuming mass of the car stays the same) because of f=mg. But I am not so sure about of the aerodynamics of the car plays a role. Say, a faster car might have more air under their wheels and might exert less force on to the ground. Maybe a...
Car A has a dead battery and car B gives a jump to it. I connect the positive of battery B to the positive of battery A and the negative of battery B to the body of car A.
1. Am I essentially creating a separate circuit by choosing a different ground than that of battery A? How is the current...
A recent thread posed the question whether work is done by static friction in the case of an accelerating car. Before I had a chance to reply, the thread was closed on the grounds that the subject was "beaten to death". Undaunted, I am determined to deliver the coup de grâce here with a simple...
I tried this but I don't know if it makes sense:
Average velocity from A to B = 22/2 = 11m/s
Average velocity from B to C = 104/4 = 26m/s
(26-11)/6 = 3.75m/s
I'm asking for clarification, but it's my understanding, that of the thread below, and my college physics book Paul A tipler, that when walking or driving a car, the force of friction from the ground does no work. This makes sense in a car becuase the engine/fuel makes the power, driving the...
I am no expert, so forgive me if I sound rather ignorant, but I'm curious about this: are typical automobile fuels like gasoline, diesel and ethanol more energetic than, specifically, *chemical* rocket fuels [like perhaps the types used in missiles, space-bound rockets and such] if measured by...
Summary:: We have to make a car which
-Has to have a trigger mechanism
-after 5s the car launches a projectile backwards to push the car forwards at least 6m
-NO ELECTRICITY ALLOWED, no motor, timer, etc
-weight limit of 1kg
Here it goes, we have to create a car powered solely by gravitational...
Hey guys I'm currently working on a school physics project and I need some ideas for it. So basically the goal of the project is to create a vehicle that has to propel itself forward by firing a projectile backwards.
The vehicle will be judged based on a scoring system that includes 3 criteria...
Summary: Basicly i am trying to find out if there's anyway to calculate the diffrence in pressure underneath and above the car so i can calculate the downforce
Hello I am doing a project about aerodynamics of a formula 1 car
when i wanted to do calculations of how much downforce each...
I found the following law for the state of CT
Type 2 or 2A Lights—Upper beam limited to 20,000 to 75,000 candela per lamp. Lower beam limited to 15,000 to 20,000 candela per lamp.
Type 1 or 1A Lights—Upper beam limited to 18,000 to 60,000 candela per lamp.
I can't find a definition of Type 2...
QUESTION:
If all the curves were removed, making a straight line from top to bottom, how quickly could a car reach the top of a mountain?
VARIABLES:
The mountain has a slope of 6.4%
The car's initial velocity is 0.
The car's top speed is 203 mph, (which will also be its final velocity as it...