JEE MAIN - Physics (2019 - 9th April Morning Slot - No. 20)
The stream of a river is flowing with a speed
of 2km/h. A swimmer can swim at a speed of
4km/h. What should be the direction of the
swimmer with respect to the flow of the river to
cross the river straight ?
150°
120°
60°
90°
Explanation
Draw velocity diagram
_9th_April_Morning_Slot_en_20_1.png)
$$\sin \theta = {{{v_r}} \over {{v_{sr}}}} = {1 \over 2}$$
$$\theta = {30^o}$$
$$\phi $$ = 90 + $$\theta $$ = 120°
$$\sin \theta = {{{v_r}} \over {{v_{sr}}}} = {1 \over 2}$$$$\theta = {30^o}$$
$$\phi $$ = 90 + $$\theta $$ = 120°
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