- #1
paul9619
- 11
- 0
Hi all,
Another teaser that I have been attempting is the following:
A Locomotive (A) pulls two tracks (B) and (C). The masses of A,B & C are 80, 25 and 20 tonne respectively. The train starts from rest and accelerates uniformally to cover 2KM in 8 minutes. Assume the resistance to motion of the locomotive and the trucks is 200N/tonne
1. Calculate the tractive effort developed by the locomotive A.
I have used the formula: Tractive Effort = Total resistance to motion (R) + Mass x Acceleration.
The total resistance to motion is 200/N tonne x (80+25+20) = 25KN
The mass is 125 Tonne
The acceleration I have as 0.01736111 m/s using s=ut+1/2at^2.
Therefore I have the tractive effort as 27.17K Newtons.
Is this right?
2. Calculate the draw-bar pull between A and B
3. Calculate the draw bar pull between B & C
I am struggling with 2 and 3. Could anyone give me any pointers??
Another teaser that I have been attempting is the following:
A Locomotive (A) pulls two tracks (B) and (C). The masses of A,B & C are 80, 25 and 20 tonne respectively. The train starts from rest and accelerates uniformally to cover 2KM in 8 minutes. Assume the resistance to motion of the locomotive and the trucks is 200N/tonne
1. Calculate the tractive effort developed by the locomotive A.
I have used the formula: Tractive Effort = Total resistance to motion (R) + Mass x Acceleration.
The total resistance to motion is 200/N tonne x (80+25+20) = 25KN
The mass is 125 Tonne
The acceleration I have as 0.01736111 m/s using s=ut+1/2at^2.
Therefore I have the tractive effort as 27.17K Newtons.
Is this right?
2. Calculate the draw-bar pull between A and B
3. Calculate the draw bar pull between B & C
I am struggling with 2 and 3. Could anyone give me any pointers??