Original post by r_g1452
Completely stuck on this question:
Original post by r_g1452
Original post by mqb2766
You could resolve the forces parallel to the plane
Original post by r_g1452
I got 15g sin 30 for the lower part of the plane
Edit - another similar way is to note you could add the weight and P together tip to tail and the resultant must be perpendicular to the plane which gives a right triangle.
(edited 9 months ago)
Original post by mqb2766
You mean 15g/2 acts down the plane? So P must provide an equal and opposite force up the plane for equilibrium.
Original post by r_g1452
Original post by r_g1452
I got 15g cos 30 down the plane?
(edited 9 months ago)
Original post by r_g1452
15gsin(30) = 73.5/cos(30) = 84.87N = P ?
Original post by mqb2766
agree with the answer, but be careful how you write it down.
Original post by r_g1452
2 significant figures?
73 = 84
I know what you mean, but its not correct mathematically.
Original post by mqb2766
No, youve written something like
73 = 84
I know what you mean, but its not correct mathematically.
73 = 84
I know what you mean, but its not correct mathematically.
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