goIIT: IIT JEE AIEEE CET WBJEE VITJEE BITSAT IIIT AICET Engineering Entrance Experts, Student Discussion Community, IIT JEE Preparation Online

i have a doubt. how come

1N = (KG/2) x (M/2) / (S/2)^2 become kg m / s^2 itself? please clarify me this.

if the units of mass,lenght and time are doubled, then the unit of force increases by _ %?

the answer is 0%, but please explain this answer using it's unit.. that is N = kgm s^-2

please give the answer with detailed explanation and solution. rates will be given for all answers.................

If S_m : S_n is equal to 441:256. what is the ratio of t_m: t_nequal to?

your options are:

a) 21:16 b) 41:31 c) 31:41 d) 16:21

the formulae to be used in this sum are:

S_n= n/2 (2a + (n-1)d) and t_n= a + (n-1)d

please reply. points will be given for sure.give the correct answer with proper explained solution.

the solution is: i have found the solution. please explian me the soltuion alone.

Sm=441=21^2=Sum of first 21 odd numbers(Sum of first n odd numbers is n^2).Also Sn= 256=Sum of first 16 odd numbers.So Tm=(2*21)-1=41 and Tn=(2*16)-1=31.So the answer is 41:31

just clarify me. how t_nand t_m are being found? please. what formulae is used here?

sir

please tell me about iit and it's prospects. suggest how we have to prepare for it from 9th standard. what are the books about science to learn apart from text books. suggest me a coaching institute.