A trolley wire weighs 1.2 kg per meter length. The ends of the wire are attached to two poles 20 meters apart. If the horizontal tension is 1500 kg find the dip in the middle of the span

A. $$2{\text{P}}\sin \frac{\theta }{2}$$ B. $$2{\text{P}}\cos \frac{\theta }{2}$$ C. $$2{\text{P}}\tan \frac{\theta }{2}$$ D. $$2{\text{P}}\cot \frac{\theta }{2}$$

A. Equal to B. Less than C. Greater than D. None of these

A. $${\left( {\sum {\text{V}} } \right)^2} + {\left( {\sum {\text{H}} } \right)^2}$$ B. $$\sqrt {{{\left( {\sum {\text{V}} } \right)}^2} + {{\left( {\sum {\text{H}} } \right)}^2}} $$ C. $${\left( {\sum {\text{V}} } \right)^2} + {\left( {\sum {\text{H}} } \right)^2} + 2\left( {\sum {\text{V}} } \right)\left( {\sum {\text{H}} } \right)$$ D. $$\sqrt {{{\left( {\sum {\text{V}} } \right)}^2} + {{\left( {\sum {\text{H}} } \right)}^2} + 2\left( {\sum {\text{V}} } \right)\left( {\sum {\text{H}} } \right)} $$

A. $${\text{a}} = \frac{\alpha }{{\text{r}}}$$ B. $${\text{a}} = \alpha {\text{r}}$$ C. $${\text{a}} = \frac{{\text{r}}}{\alpha }$$ D. None of these