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CBSE Class 11-science Answered

a stream 200m broad is running downward at the rate of 1 km/h .a swimmer who can swim at the rate of 2 km/h wishes to reach a point just opposite . along what line should he striker and how long will he taker is crossing ?
Asked by hrushikesh.barik | 11 Oct, 2017, 08:16: PM
answered-by-expert Expert Answer
begin mathsize 12px style straight theta equals tan to the power of negative 1 end exponent open parentheses 1 half close parentheses equals 26.56 space degree end style
 
begin mathsize 12px style He space should space strike space along space the space line space at space angle space 26.56 space degrees space with space vertical space joining space the space two space sides space of space the space stream. resultant space velocity space along space the space line space along space which space he space will space travel space on space equals square root of 1 squared plus 2 squared end root space equals space square root of 5 space km divided by straight h space space space space space left parenthesis cosθ equals 0 right parenthesis end style  
 
begin mathsize 12px style How space long space he space will space take space straight i. straight e. space time space can space be space given space as space Time equals distance over speed equals fraction numerator 0.2 over denominator square root of 5 space end fraction hour end style
Answered by Gajendra | 27 Nov, 2017, 06:34: PM

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CBSE 11-science - Physics
two forces whose magnitude are in the 3:5 give a resultant f Jatio 3:5 give 20 N. If fac 20. It fue angle of thread indination of each face find Magnitude
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Asked by vinitdubey7735 | 14 Mar, 2024, 11:21: AM
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CBSE 11-science - Physics
please provide complete solution
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Asked by dhanshreekansyakar | 09 Jan, 2024, 11:57: AM
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CBSE 11-science - Physics
A×B where A= 2i-3j-k and B =i+4j-2k
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Asked by banhisikhapanda49 | 07 Nov, 2023, 10:42: PM
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CBSE 11-science - Physics
1.State paralogram law of vector addition and derive magnitude and the direction of a resultant vector  
Asked by preethiprithivi05 | 21 Feb, 2023, 09:28: PM
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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
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CBSE 11-science - Physics
what is dot product
Asked by Kattaithihaas | 24 Jul, 2022, 01:23: PM
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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
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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
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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
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CBSE 11-science - Physics
how to find component of vector ?
Asked by aditya000ghoderao | 19 Jan, 2022, 05:05: AM
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