can you please guide me through the means to contact topperlearning, i have been given a no. of shikha ma'am and i lost it, now I am having some queries, which i tried to get solved by dialing no., one which is on the site,but it didn't worked. In last question, i wanted to ask why while calculating change in pressure (3*10^5*980) is calculated keeping density uniform for we know pressure= height of vertical column*density* acceleration due to gravity, why density is assumed to be 1g/cm^3 I am worried i am loosing my net question allowed limit,,,,,,by discussing questions again,, tell me pls what is this limit is or give me the no. of shikha ma'am Would you pls answer my second question in this querry???pls