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[danial 234]

can anyone explain to me the answer of 4b of M/J 11 /22

 

[Shadow]

What's the answer to this? Is it C (the questions from june2009 btw)

Its B, coz for an object to be in equilibrium, the net force is zero. Both clockwise n anti-clockwise forces r equal. Total upward force shud also b equal to the total force applied down

 

[Shadow]

can anyone explain to me the answer of 4b of M/J 11 /22

cork B is xactly half-way between two wavefronts. Now see the graph for A. As it says halfway, u can imagine cork B to be on o.25 s. See the whole pattern of A after o.25. This is how cork B is displaced. Wen u start this wave from 0 s, it vil have the same wavelength just the position of crests n troughs vil b reversed.

 

[Snowysangel]

Its B, coz for an object to be in equilibrium, the net force is zero. Both clockwise n anti-clockwise forces r equal. Total upward force shud also b equal to the total force applied down

I still don't get it. Is the force upward on the pivot resulting in a clockwise moment or an anticlockwise one?

 

[Shadow]

I still don't get it. Is the force upward on the pivot resulting in a clockwise moment or an anticlockwise one?

No, its an upward force simply, opposing gravity. The upward force is a sum of both the forces acting down in B only, so object gets in equilibrium as the upward n downward forces cancel each other

 

[Snowysangel]

No, its an upward force simply, opposing gravity. The upward force is a sum of both the forces acting down in B only, so object gets in equilibrium as the upward n downward forces cancel each other

Oh thanks