Question

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 if
the engine exerts a force of of 40000 Newton and the track offer a friction force of 5000
Newton then calculate-a) the net acceleration force. b) the acceleration of the train.{can anyone help me}​

Answer 1

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.

Answer 2

Answer:

$\sf{Explaination\:Required\:}\purple{\purple\checkmark}$

1. Give the hierarchy of five kingdom classification of the living world

• Monera

• Protista

• Fungi

• Plantae

• Animalia

2. Refer to the attachment