Recent content by ryt

now i came to a bigger problem, and i stuck. what is the 197. combination of size 5 without repeating of elements a,b,c,d,e,f,g,h,i,j,k,l ?

thx might also help, thx

i think i understand, almost. What is r? Is this total number of combinations?

[SOLVED] simple combinations problem Homework Statement what is 12. combination of combinations with 3 elements of 1,2,3,4,5,6,7 ? Homework Equations The Attempt at a Solution i tried step by step 123 - 124 - 125 - 126 - 127 - 134 - 135 - 136 - ... - and finaly i arrived at...

why gravitational potential energy is negative?

thx :) i understand it now

thx how do u know F'(a)=0 ??

i start to study integrals, i couldn't understand some things. definite integrals i didnt understand, ill show it on some eg. on v as derivative of disaonce s. the eg. was to calc how many distance s = ? does a particle travell when we throw it in air (up) and v reaches 0. so in time t = 0...

hi im new to this forum, i yust registered, and i think is great forum, the best and wery helpfull im on a physics and informatics colledge, i need to pass classical mechanics (i have some dificulties with it), so i have a question does somebody know some good book about classical mechanics...