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    A car bonnet, represented by QP, of mass 12 kg is pivoted at P. Its weight acts at G where QG = GP = 1.0 m.

    What force, F, acting perpendicular to QP as shown, is required to hold the bonnet at 30° to the horizontal?

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    (Original post by d010534)
    A car bonnet, represented by QP, of mass 12 kg is pivoted at P. Its weight acts at G where QG = GP = 1.0 m.

    What force, F, acting perpendicular to QP as shown, is required to hold the bonnet at 30° to the horizontal?

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    Have you tried resolving vertically? seems pretty straightforward to find out what the vertical component of F is.
 
 
 
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