KAB , or i should say Adarsh ,

can u tell me what r u preparing for ????

in which class u r ????

Hi ,

the correct answer is k=2 , and i got it .

work done = F.dx , where dx is the distance b/w final and initial points . let's take two points (0,5/3) and (5/k,0) which lie on the given line

Then , dx = 5/ki + 5/3j

hence , F.dx=0 (bcoz W=0)

i.e. 10/k-5=0

k=2

Hi all ,

well , the answer i hav says (a) and (c) are correct !!!!!

Hi KAB ,

yes , this is the right answer . Thanks a ton for helping me .

I think we can be friends and help each other with diff. problems

Thanks again !!! 

 

i dont know the answer , but the options are -

(a) 2ax[1-(x/r)^2]

(b) 2ax

(c) 2a(x/r)^2

(d) 2ax[1-(x/r)^2]^1/2

more than one correct -

 

P is the COM of mass of 4 point masses A,B,C and D , which are coplanar but not collinear .

(a) P may or may not coincide with one of the point masses

(b) P must lie within the quadrilateral

(c) P must lie within or on the edge of atleast one of the triangles formed by taking any three of A,B,C and D

(d) P must lie on a line joining two of the points A,B,C,D

Hi KAB ,

are you sure that there will be no effect of circular motion ?????

Hi yahiyafirdous ,

I am not able to understand how u got radius vector = i-kj . also , the options i have for the value of k are  2 , 4 , 6  &  8

solve -

The K.E. of a particle moving along a circle of radius r is K=ax^2 , where 'a' is cont. and x is distance covered . What is the force acting on the particle ????

solve -

Force acting on a particle is (2i + 3j)N . Work done by this force is zero , when a particle is moved on the line 3y+kx=5 . Hence , find the value of k ?????

Hi ,

can u please mail me the test papers . My email id is callumang@gmail.com . Thanks !!!

Respected sir ,

I am a regular user of goiit.com . I like the notes on various topics provided in this site .There are various topics , on which nothing is given . I would like to know when will the material be available for these topics . Also , I would request u to tell me some educational links which can help me in my preparation .I am preparing for IITJEE 2008 .

Thank you ,

Umang