Variometer is useful in________. (Paragliding, River Rafting, Surfing, Rock Climbing​)

Fill in the blanks with appropriate words : Nylon fibre is used in making ropes for rock climbing and parachutes because it is a very _____ fibre.

Name the materials used in making parachutes and ropes for rock climbing.

A boat can be rowed in still water at a speed u. The boat is moving downstream in a river in which water flows at a speed v. There is raft floating in water and therefore moving along with water at speed v. Let the boat overtakes the raft at the moment t = 0. The distance between the boat and raft at a later instant of time t is

A boat can be rowed in still water at a speed u. The boat is moving downstream in a river in which water flows at a speed v. There is raft floating in water and therefore moving along with water at speed v. Let the boat overtakes the raft at the moment t = 0. If the raft has covered a distance x during the interval in which boat overtakes the raft, turns back and crosses it again the speed of stream is

A boat can be rowed in still water at a speed u. The boat is moving downstream in a river in which water flows at a speed v. There is raft floating in water and therefore moving along with water at speed v. Let the boat overtakes the raft at the moment t = 0. Let the boat turns back at time t=t_(0) and starts moving towards the raft. The separation between the raft and boat after a time interval t' measured from the moment of turning back is

When a boat travels in a river (strictly in a straight line), it can go either in the direction of flow of river (i.e downstream) or in the direction opposite the flow of river (i.e. upstrem ). Thus the boat's actual speed is more than by which it can move in stationary water while travelling downstram (as river's flow speed is added to it) and less while travelling upstream (as the boat moves against the flow of river).Based on the given information answer the following questions A boat going downstream in a following river overcome a raft at a point P. 1 h later it turned back and after some time passed the raft at a distance 6 km from point P. After reversing its direction ,how much time was taken by the boat to meet the raft again ( i.e. 2^(nd) time) ?

Explain the following terms in relation to the use of interne? (i) Internet surfing (ii) social networkin (iii) E-mail.

A boat can be rowed in still water at a speed u. The boat is moving downstream in a river in which water flows at a speed v. There is raft floating in water and therefore moving along with water at speed v. Let the boat overtakes the raft at the moment t = 0. After how much time, measured from the moment of turning back the boat will cross the raft again ?