Ask a Doubt
Request a call back

Join NOW to get access to exclusive study material for best results

CBSE Class 11-science Answered

A man can swim at a speed of 3km/h in still water.He wants to cross a 500m wide river flowing at 2km/h.He keeps himself always at an angle of 120 degrees with the river flow while swimming. (i) Find the time he takes to cross the river (ii) At what point on the opposite bank will arrive?
Asked by snehamapink | 29 Jul, 2012, 09:52: PM
Expert Answer
3 cos 30° would be responsible for crossing the river ie 500 m=1/2 km
time taken=1/2 ÷3?3/2
                =1/3?3  hr
on the opposite bank he will arrive=1/6?3 km
Answered by | 02 Aug, 2012, 11:16: AM
Multiple Choice Questions Practice Test Subjective Questions Webinar Subjective Questions Pre Board Assessment

Concept Videos

Answered Unanswered My Questions My Answers
CBSE 11-science - Physics
Que: Equal and opposite charges cancel out eachother's effect then why doesn't centrifugal force cancel out centripetal force's effect on a particle moving in circular motion?
Asked by advssdrall | 07 Oct, 2022, 11:11: PM
ANSWERED BY EXPERT
CBSE 11-science - Physics
What do your understatnd by (1)position vector and (ii) displancment vector. Distinguish them with illustration.
Asked by rk274268 | 05 Aug, 2022, 01:19: PM
ANSWERED BY EXPERT
CBSE 11-science - Physics
what is dot product
Asked by Kattaithihaas | 24 Jul, 2022, 01:23: PM
ANSWERED BY EXPERT
CBSE 11-science - Physics
a boat's speed in still water is 20km/h .if the boat is to travel directly across a river whose current has a speed of 12km/h ,at what upstream angle must the boat head?
Asked by pawankumardas15492 | 22 Jul, 2022, 10:24: PM
ANSWERED BY EXPERT
CBSE 11-science - Physics
A baseball is hit by a bat and given a velocity of 40.0m/s at an angle of 30 degree above the horizontal. The height of the ball above the ground upon impact with the bat is 1.0 m  a) what maximum height above the ground does the wall reached b) a feilder is 110.0 m from home plate with the ball is hit and the balls trajectory is directly at home if he begins running at the moment the ball is hit and catches the ball. when it is still 3.0 m above the ground. How long does he run before catching the ball. C) how fast does he have to run in order to catch the ball
Asked by lonese3325 | 12 Jun, 2022, 01:42: PM
ANSWERED BY EXPERT
CBSE 11-science - Physics
A particle is located at 5i^ +6j^ + 7k^ at t=0.. After 5 seconds, it is located at 2i^+5j^ +5k^. The magnitude of displacement of  the particle in XY plane is: ???
Asked by nutankumari95074 | 11 Jun, 2022, 05:24: PM
ANSWERED BY EXPERT
CBSE 11-science - Physics
if |A|=|B|=|A-B|, then find the angle b/w the two vectors
Asked by kaziryan.05 | 13 Apr, 2022, 09:01: PM
ANSWERED BY EXPERT
CBSE 11-science - Physics
how to find component of vector ?
Asked by aditya000ghoderao | 19 Jan, 2022, 05:05: AM
ANSWERED BY EXPERT
CBSE 11-science - Physics
A particle of mass m is given speed u at angle theta at topmost point It breaks into two equal parts one comes to rest  find point of landing of second mass
Asked by ashishgarud539 | 15 Dec, 2021, 04:12: PM
ANSWERED BY EXPERT
CBSE 11-science - Physics
Find the resultant and the direction of resultant of two vectors A and B with angle straight theta between them
Asked by neerajchauhan000000 | 23 Sep, 2021, 03:33: PM
ANSWERED BY EXPERT
My Class Videos Tests ₹ Plans Ask a Doubt
×