00:01
About this question it says that a box weighing 77 newtons rests on a table a rope tied to the box turns vertically or put over a pulley and his weight is hung from the other end so this is the required weight this is the box we have to determine the force that the table exerts on the box so the reaction the normal reaction if the weight hanging on the other side of the pulley way is 30 60 and 90 so there are three parts so let's talk about it the box the weight of the the box is 77 newton.
00:31
So let's show it over here.
00:32
This is 77.
00:34
We would have a tension over here and we would have a normal reaction over here as well, which we have to find.
00:40
Let's write it over to the left side.
00:42
So that's t plus n.
00:44
And then we have something which is related to the box.
00:48
So the weight.
00:49
So there we have a tension and there we have its weight.
00:53
Now the weight is changing continuously.
00:57
So first off, we need to find that till what weight this would still be in contact of the floor.
01:07
And that is possible only when the downward force, as in the 77 newton's, is greater than r equal to t plus n.
01:16
So all such instances, whenever this will happen, it will be in contact with the floor.
01:22
So let's talk about part a...