What state does gas changes when heated

Amotorboat is racing towards north at 25km/hr and water current in that region is sixty degree east to south. find resultant velocity of boat

Five point charge ,each of magnitude +q are kept at the corner of a regular hexagon of side a at a, bc, d,and . find the electric field at the centre o of hexagon.

If 1unit=rs5 for 30 days, then find out the bill of: fridge-5 kw-20 hrs & ac-1.5 kw-10 hrs