A 4.00-kg object is attached to a vertical rod by two strings. The object's speed is 6m/s, what is the tension

Question

A 4.00-kg object is attached to a vertical rod by two strings. The object rotates in a horizontal circle at constant speed 6.00 m/s. What is the tension in the upper string and the lower string.

Answer 1

You didn't provide enough information. The lower string could be completely slack. You need to provide the two string lengths and attach points. This will allow determination of the radius of the circle and solution of the problem.

Answer 2

hi Pete - the subject is which you replaced your inertial physique contained in direction of the question. You began by pointing out that each and every traveller replaced into shifting at 0.9c in opposite instructions - yet relative to what inertial physique? then you quite suggested that the inertial physique replaced into related to traveller A. as quickly as you probably did that, the courting between the two visitors replaced, because you may state relative velocities in terms of one physique of reference. once you do this and prepare the Lorentz rework equations as defined above, you hit upon that no merchandise can attain the fee of sunshine relative to a diverse observer in any physique of reference. issues like measured term and measured length interior the inertial physique substitute as a fashion to make this all real.