Physics please help
posted by Jess J .
The engine of a train has a mass of 5x10^4 kg. it can accelerate six railway cars having a total mass of 3x10^5 kg by 0.4 m/s^2 (the 6 railway cars have a combined mass of 3x10^5). what acceleration can the same engine using the same force give to four railway cars having a total mass of 2x10^5kg?
it is proportional inversely
solve for a1 in terms of the original a2 acceleration.
let us examine it:
let F be the pulling force, mu the coefficent of friction.
Net pulling force= totalmass*a
but F the pulling force remains the same on both trains
in case one, TM1= 5E4+3E5, and in case two, TM2=(5E4+2E5)
Your teacher did not specific the friction. If you ignore friction, mu=0, but mu is hardly ever even close to zero on a freight train.