Question

Which of these conditions satisfy realizability?

(a) (- ho overline{u_{i}^{‘} u_{j}^{‘}})<1

(b) (- ho overline{u_{i}^{‘} u_{j}^{‘}})>1

(c) (- ho overline{u_{i}^{‘} u_{j}^{‘}})>0

(d) (- ho overline{u_{i}^{‘} u_{j}^{‘}})<0

Answer 1

Right answer is (d) (- ho overline{u_{i}^{‘} u_{j}^{‘}})<0

Easiest explanation: According to the realizability conditions, the properties which are physically non-negative must be numerically non-negative too. So,(- ho overline{u_{i}^{‘} u_{j}^{‘}})>0. Therefore, (- ho overline{u_{i}^{‘} u_{j}^{‘}}) should be less than zero.