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mechanics (1 Viewer)

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does anyone know how to do this i tried resolving but the answer does come out
 

Luukas.2

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Taking the unit vectors i and j as upwards and to the right, the forces acting are:
  • a weight force of W = -mgj
  • the tension in the string of T = +Fj
  • the friction force of
  • the normal force of
The sum of these forces is


Since the object is stationary, this sum must be the zero vector. It then follows, from the i components, that:


and, from the j components, that:


and the answer is (D).

Note, substituting the value 37 degrees gives F = 0.375708... mg, which is far closer to (D) than to any of the other options.
 
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Also regarding SHM say you have a point B to the right of the origin and the particle is initially moving right. Is the time taken to go from O to B the same time to go from B to O? ( this low key is a dumb question but just checking)
 

member 6003

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Also regarding SHM say you have a point B to the right of the origin and the particle is initially moving right. Is the time taken to go from O to B the same time to go from B to O? ( this low key is a dumb question but just checking)
This is true from looking at the sine / cosine graph. I think it should also be true whether the particle initially moving left or if B is to the left of O.
 

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