Question

two blocks of mass 2.9 kg and 1.9 kg are suspended from a rigid support by 2 inextensible wires each of length 1m. upper wire has a negligible mass and the lower wire has uniform mass of 0.2 kg/m. the whole system of blocks , wire and support have an upward acceleration of 0.2 m/s^2. find
1. the tension at the mid point of lower wire.
2. the tension at the mid point of upper wire.

Answer 1

Answer:

30N and 50N.

Explanation:

Since from the given question we see that the system is accelerated upwards hence the tension at any point will be given as:-

T=m(g+a).  

So, from the point which is the mid point of the lower tower will be given as, and the mass m will be =2.9+0.22=3.  

Therefore, T=m(g+a)=3(9.8+0.2)=30N at the mid point of lower wire.  

For the point which is at the mid point of the upper wire will be given as, and the mass  m will be =2.9+0.2+0.9+0=5kg.  

Again, at the mid point of upper wire will be T=m(g+a)=5(9.8+0.2)=50N.