A plane is inclened at an angle of ` 30^@` with horixontal. Find the componet of a force ltbRgt ` vec F =- 10 hat k N` perpendicular to the plane. Given that z-direction is vertically upwards.

Explanation

Refer to Fig. 2 (c ). 93, it is gven that the Z-direction is vertically upwards. Therefore, the force ltbRgt ` ve F=- 10 hat k N` must be acting vertically downwards, i.e. along ` AB`, The component of ` vec F` perpendicular to the plance, i.e. along ` AC`, is
` 10 cos 30^2 = 10 xx sqrt 3 //2 = 5 sqrt 3 N`
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