A) \[mg/cos\,\theta \]
B) \[mg\text{ }cos\,\theta \]
C) \[mg\text{ sin}\,\theta \]
D) \[mg\]
Correct Answer: A
Solution :
[a] \[N=masin\theta +mgcos\theta \] ......(1) Also\[mg\text{ }sin\theta =ma\text{ }cos\theta \] ......(2) \[\text{from (2) }a=gtan\theta \] \[\therefore N=mg\frac{{{\sin }^{2}}\theta }{\cos \theta }+mg\cos \theta ,\] \[\text{or }N=\frac{mg}{\cos \theta }\]You need to login to perform this action.
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