PLEASE HELP ME An automobile of mass m1500 kg is traveling at a speed of 90km/hour on a level highway when its brakes are applied. it slows uniformly to a stop, without skidding, after traveling a distance of 55.0 meters.(a) how much heat, in calories, must have been absorbed by the brake system of the auto in order to stop it?(b)if virtually all of the heat is absorbed in the auto‘s four brake disks, and if each disk is made of steel and has a mass of 4.5kg, by how much (on average) does the temperature of each disk rise?please help methanks.please
i currently have 250,000 miles on a 86 ford the exhaust has never been touched.in fact it looks great i also have a 59 ford with exhaust i put on in the mid 70's i drive in wet weather.i don't drive on salty roads if your pipes rust so does the rest of the car
Moist is not the only enemy of exhaust systems. Just sitting around can cause a car to rust. The environment causes vehicles to rust so enjoy your vehicle.rain or shine. Exhaust systems last a long time.
Some could and some couldn't. I've had several Ford Taurus cars that the exhaust seems to last forever on, whereas my '92 Crown Victoria muffler and tailpipe has been replaced twice at 200,000 miles.
a) The KE of the car is 0.5*m*v^2 where v is the speed. This energy must be absorbed by the brakes in order to bring the vehicle to rest, and whether the braking is uniform is irrelevant, as is the distance traveled. speed 90km/her 90,000/3600m/s 25m/s So energy absorbed E 0.5*1500*25^2 468.75kJ To calculate the temperature rise, we assume that there is no heat loss (an impractical assumption) and use - E mass*specific heat*temp rise specific heat (sh) of carbon steel is 490J/kg so temperature rise E/(m*sh) 468,750/(4*4.5*490) 53C Note that in practice the braking of a car is not divided equally between the front and back wheels. More energy will be absorbed by the front brakes than the rear ones.
