Why superconductors are expensive and uncommon ? please give me a simple and a easy answer

Superconductors are expensive and uncommon because they are additionally complicated to fabricate properly.

the small 0.38-kg slider is known to move from position a to position b along the vertical-plane slot. determine (a) the work done on the body by its weight and (b) the work done on the body by the spring. the distance r = 0.70 m, the spring modulus k = 154 n/m, and the unstretched length of the spring is 0.53 m

explanation:

-reverse card

the ima (higher than 1m) will be greater than the ima with the height of 1m.