00:01
In this figure we are given two blocks.
00:04
Two blocks are given in the figure.
00:05
They are connected by massless rope.
00:08
They are connected by massless rope.
00:12
And that passes over a pulley.
00:14
And we talk about pulley which is about 12 cm diameter.
00:19
The diameter is 12 cm.
00:22
And that mass m we are given which is 2 kg.
00:26
2 kg here.
00:28
That mass.
00:28
The pulley is turned to friction.
00:30
The axis is torque.
00:31
So torque tau which is equal to 0 .30 nm.
00:36
And the block released from the rest which means initial velocity 0 m per second.
00:41
And so we want to find how long.
00:44
So how long which means time we want to find to take the 4 kg block that reach the floor.
00:52
So time denoted by t.
00:53
So we want to find the time here.
00:55
And the mass of the 4 kg we can say.
00:58
Take a capital m which is equal to 4 kg.
01:01
So let's solve this question and find the answer.
01:03
So first we understand that the force acting on this 4 kg mass.
01:08
So here we can write f net 1 which is equal to we can write m1 multiplied by g minus t1...