Home
Class 11
PHYSICS
A man can swim with a speed 4km/hr in st...

A man can swim with a speed 4km/hr in still water.
(a) How long does he takes to cross a river 1 km wide if the river flows steadily at 3 km/hr and makes his strokes normal to the river current?
(b) How far down the river does he go when he go when he reaches the other bank?

A

500 m

B

600 m

C

750 m

D

850 m

Text Solution

Verified by Experts

The correct Answer is:
C
Time to cross the river,
`t=("Widht of river")/("Speed of man")=(1km)/(4kmh^(-1))=(1)/(4)h`
Distance moved along the river in time t,
`s=v_(r)xxt=3kmh^(-1)xx(1)/(4)h=(3)/(4)km=750m`
Promotional Banner

Topper's Solved these Questions

  • MOTION IN A PLANE

    NCERT FINGERTIPS|Exercise Higher Order Thinking Skills|8 Videos

  • MOTION IN A PLANE

    NCERT FINGERTIPS|Exercise NCERT Exemplar|10 Videos

  • MOTION IN A PLANE

    NCERT FINGERTIPS|Exercise Uniform Circular Motion|14 Videos

  • MECHANICAL PROPERTIES OF SOLIDS

    NCERT FINGERTIPS|Exercise Assertion And Reason|15 Videos

  • MOTION IN A STRAIGHT LINE

    NCERT FINGERTIPS|Exercise Assertion And Reason|15 Videos

Similar Questions

Explore conceptually related problems

A man can swim with a speed of 4kmh^(-1) in still water. He crosses a river 1km wise that flows steadly at 3kmh^(-1) . If he makes his strokes normal to the river current, how far down the river does he go when he reaches the other bank?

A man can swin with speed 6 km/h in still water. If he tries of swim across a river flowing with speed 5km/h, how fast does a leaf floating on water appears to go , to the man ?

A man can swim at a speed of 3 km h^-1 in still water. He wants to cross a 500-m wide river flowing at 2 km h^-1 . He keeps himself always at an angle to 120^@ with the river flow while swimming. The time taken to cross the river is.

A man can row 6km/hr in still water.It takes him twice as long to row up as to row don the river.Find the rate of stream.

A man can swim at a speed of 3 km h^-1 in still water. He wants to cross a 500-m wide river flowing at 2 km h^-1 . He keeps himself always at an angle to 120^@ with the river flow while swimming. The drift of the man along the direction of flow, when he arrives at the opposite bank is.

A man can row at a speed of 10 km/hr in still water to a certain upstream point and back to the starting point in a river which flows at 4 km/hr. Find his average speed for total journey.

A man can swim at a speed of 5km//h in the still water. He wants to cross a 1600m wide river flowing at 4 km//h . He keeps himself at an angle 127^(@) with the river flow while swimming. (a) Find the time he takes to cross the river. (b) Find the distance traveled by him along the flow.

A river flows at 3 m/s and is 300 m wide . A man swing across the rivers with a velocity of 2 m/s directed always perpendicular to the flow of current . (a) How long does it take the man to cross the river ? (b) In what direction does he actually moves to cross the relative to the shore ? (c) How far down the fiver(from the starting point ) does he reach the opposite bank?

A man can swim at a speed of 5 km/h W.r.t water. He wants to cross a 1.5 km wide river flowing at 3 km/h. He keeps himself always at an angle of 60° with the flow of direction while swimming, The time taken by him to cross the river will be