Saved Bookmarks
| 1. |
Give the hierarchy of five kingdom classification of living world.42. A 8000 kg engine pulls A train of 5 wagons each of 2000 kg along a horizontal track ifthe engine exerts a force of of 40000 Newton and the track offer a friction force of 5000Newton then calculate-a) the net acceleration force. b) the acceleration of the train.{can anyone help me} |
|
Answer» Answer: Mass of engine M=8000 kg Mass of each wagon m=2000 kg Frictional force acting in BACKWARD direction F=5000 N (a) : The net force acting on the train F ′ =F−f=40000−5000=35000 N (b) : Let the acceleration of the train be a ∴ F ′ =(5m+M)a 35000=(5×2000+8000)a ⟹a=1.944 ms −2
(c) : External force is APPLIED directly to wagon 1 only. The net force on the LAST four wagons is equal to the force applied by wagon 2 by wagon 1. Let the acceleration of the wagons be a ′
35000=(5m)a ′ ⟹35000=10000×a ′
Acceleration of the wagons a ′ =3.5 ms −2
Mass of last 4 wagons m ′ =4×2000 kg ∴ Net force on last 4 wagons F 1
=8000×3.5 =28000 N Thus force on wagon 2 by wagon 1 is 28000 N. |
|