What steps can be taken to restore the river Ganga to its past glory?

What step can be taken to achieve high revolving power of a telescope?

What can you say about the motion of an object if its speed time graph is a straight line parallel to the time axis?

. A wire is replaced by another wire of same length and material but of twice diameter. (/) What will be the effect on the increase in its length under a given load? (//) What will be the effect on the maximum load which it can bear?

A steel wire of diammeter 2 mm is pulled to increase its length by 1% what is the restoring force developed in it if young's modulus for steel 2 *10^12 dynes/ cm ^2 .

A swimmer can swim with Velocity of 10 km/h. w.r.t, the water flowing in a river with velocity of 5 km/h. In what direction should he swim to reach the point on the other bank just opposite to his starting point?