A river is flowing due east with a speed 3m/s. Swimmer can swim in still water at a speed of 4 m//s (shown in the figure)
If he wants to start from pont A on south bank and reach opposite point B on north bank.
What will be his resultant speed?

A river is flowing due east with a speed 3m/s. Swimmer can swim in still water at a speed of 4 m//s If he wants to start from pont A on south bank and reach opposite point B on north bank. Which direction should he swim.

A river is flowing due east with a speed 3m/s. Swimmer can swim in still water at a speed of 4 m//s (shown in the figure) If swimmer starts swimming due north, what wil be his resultant velocity (magnitude and direction).

Rain is falling vertically with a speed of 30 ms^-1 . A woman rides a bicycle with a speed of 10 m s^-1 in the north to south direction. What is the direction in which she should hold her umbrella ?

A hill is 500 m high. Supplies are to be sent across the hill using a canon that can hurl packets at a speed of 125 m//s over the hill. The canon is located at a distance of 800m from the foot of hill and can be moved on the ground at ba speed of 2 m//s, so that its distance from the hill can be adjusted. What is the shortest time in which a packet can reach on the ground across the hill? Take g= 10 m//s^(2) .

A man wants to reach from A to the opposite corner of square C ( shown in the figure) . The sides of the square are 100m.A central square of 50 mxx50m is filled with sand. Outside this square, he can walk at a speed 1 m/s. In the central square, he can walk only at a speed of v m/s (v>1). What is smallest value of v for which he can reach faster via a straight path through the sand than any path in the square outside the sand.

A player throws a ball upwards with an initial speed of 29.4 m s^-1 :- What are the velocity and acceleration of the ball at the highest point of its motion ?

A sonar device on a submarine sends out a signal and receives an echo 5s later. Calculate the speed of sound in water if the distance of the object from submarine is 3,625 m.

A stone is thrown with an initial speed of 4.9 m/s from a bridge in vertically upward direction . It falls down in water after 2 sec. Find height of the bridge.

A train, standing in a station-yard, blows a whistle of frequency 400 Hz in still air. The wind starts blowing in the direction from the yard to the station with a speed of 10 m s^-1 . What are the frequency, wavelength, and speed of sound for an observer standing on the station’s platform? Is the situation exactly identical to the case when the air is still and the observer runstowards the yard at a speed of 10 m s^-1 ? The speed of sound in still air can be taken as 340 m s ^-1 .

A horizontal straight wire 10 m long extending from east to west is falling with a speed of 5.0 m s^-1 , at right angles to the horizontal component of the earth’s magnetic field, 0.30 xx 10^-4 Wb m^-2 , What is the direction of the emf?