A moves with while is coming back of with 80 . The relative velocity of with respect to is
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units
A boat crosses a river with a velocity of . If the resulting velocity of boat is then the velocity of river water is
both are moving in the same direction]
A boat is moving with a velocity with respect to ground. The water in the river is moving with a velocity with respect to ground. The relative velocity of the boat with respect to water is
A boat is moving westwards with a speed of and a boat south of is moving norhtwards with a speed of . The time after which the distance between then becomes shortest is
Relative velocity .
A boat is moving upstream with velocity with respect to ground. An observer standing on boat observes that a swimmer is crossing the river perpendicular If river flow velocity is and swion of motion of boat. of width in , then
velocity of swimmer w.r.t ground is
drift of swimmer along river is zero
drift of swimmer along river will be
Time taken to reach shortest distance between bande .
If rain falls vertically with a velocity. and wind blows With a velocity from east to west, then a person standing on the roadside should hold the umbrella in the direction
and
Drift
If is the velocity of rain falling vertically and is the velocity of a man walking on a level road, and is the angle with vertical at which he should hold the umbrella to protect himself, than the relative velocity of rain w.r.t. the man is given by:
Man should hold the umbrella in the direction of the relative velocity of the rain. If velocity of rain, velocity of wind and relative velocity of rain w.r.t. wind
A river flow with a speed more than the maximum speed with which a person can swim in the still water. He intends to cross the river by shortest possible path (i.e., he wants to reach the point on the opposite bank which directly opposite to the starting point). Which of the following correct?
He should start normal to the river bank.
He should start in such a way that, he moves normal to the bank, relative to the bank.
He should start in a particular (calculated) direction making an obtuse angle with the direction of water current.
The man cannot cross the river, in that way.
A person aiming to reach the exactly opposite point on the bank of a stream is swimming with a speed of at an angle of with the direction of flow of water. The speed of water in the stream is
.
A swimmer wants to cross a river straight. He swim at in still water. A river wide flows at the rate of . Which of the following figure shows the correct direction for the swimmer along which he should strike? velocity of swimmer, velocity of river, resultant velocity)
The swimmer will cross straight if the resultant velocity of river flow and swimmer acts perpendicular to the direction of river flow. It will be so if the swimmer moves making an angle with the upstream. i.e. goes along .
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