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Why they took vertical component as 4cos 60 and horizontal as 4sin 60

Why they took vertical component as 4cos 60 and horizontal as 4sin 60

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Grade:12th pass

2 Answers

Mahima Kanawat
1010 Points
6 years ago
Dear student ....Base angle is always taken as cos ,it does not matter whether the line is vertical or horizontal .Here , base angle is on vertical that is why they took vertical component as 4cos 60 and horizontal as 4sin 60....With Regards ....Mahima....(askIITians Forum Expert)
Rishi Sharma
askIITians Faculty 646 Points
3 years ago
Dear Student,
Please find below the solution to your problem.

As external torque is zero just apply conservation of angular momentum.
I1W1 = I2W2.
So (MR²/2)w0 = (MR²/2 + mR²)w.
So new w = Mw0/(M+2m).

Thanks and Regards

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