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. `500m`B. `600m`C. `750m`D. `850m`

A man can swim with a speed of `4kmh^(-1)` in still water. He crosses

1.	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. `500m`B. `600m`C. `750m`D. `850m`
Answer» Correct Answer - c Time to cross river, `t=("Width of river")/("Speed of man")` `=(1km)/(4kmh^(-1))=1/4h` Distance moved along the river in time t `=V_(r)xxt=3km^(-1)xx1/4h=3/4km=750m`

Discussion

No Comment Found

Related InterviewSolutions

Find the angle of projection of a projectile for which the horizontal range and maximum height are equal.A. `theta=45^(@)`B. `theta=tan^(-1)(1/4)`C. `theta=tan^(-1)(4)`D. `theta=tan^(-1)(2)`
The horizontal range of a projectile is `4 sqrt(3)` times its maximum height. Its angle of projection will beA. `45^(@)`B. `60^(@)`C. `90^(@)`D. `30^(@)`
Find the angle of projection of a projectile for which the horizontal range and maximum height are equal.A. `45^(@)`B. `theta = tan^(-1) (0.25)`C. `theta = tan^(-1) 4` or `(theta = 76^(@))`D. `60^(@)`
The centripetal acceleration is given byA. `v2//r`B. v2rC. vrD. `v//r`
A cycle wheel of radius 0.4 m completes one revolution in one second then the acceleration of a point on the cycle wheel will beA. `0.8 m//s`B. `0.4 m//s`C. `1.6 pi^(2) m//s^(2)`D. `0.4 pi^(2) m//s^(2)`
The angular speed of a fly wheel making 120 revolutions / minute isA. `2pi rad//s`B. `4pi^(2)pi//rad`C. `pi rad//s`D. `4pirad//s`
A wheel completes 2000 revolutions to cover the 9.5 km. distance. then the diameter of the wheel isA. `1.5m`B. `1.5 cm`C. `7.5 cm`D. `7.5 m`
A car is moving in a circular horizonta track of radius 10m with a constant speed of 10 m/s. A pendulum bob is suspended from the roof of the cat by a light rigid rod of length 1.00m. The angle made by the rod with track isA. ZeroB. `30^(@)`C. `45^(@)`D. `60^(@)`
Assertion : Improper banking of roads causes wear and tear of tyres. Reason : The necessary centripetal force is provided by the force of friction between the tyres and the road.A. If both assertion and reason are true and the reason is the correct explanation of the assertionB. If both assertion and reason are true but reason is not the correct explanation of the assertion.C. If assertion is true but reason is false.D. If the assertion and reason both are false.
A stone tied to the a string of `80 cm` long is whirled in a horizontal circle with a constant speed. If the stone makes `25` revolutions in `14 s` then, magnitude of acceleration of the same will be:A. `650 cm//s^(2)`B. `680 cm//s^(2)`C. `750 cm//s^(2)`D. `990 cm//s^(2)`

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. `500m`B. `600m`C. `750m`D. `850m`

Discussion

No Comment Found

Related InterviewSolutions

Reply to Comment