Messages posted by akshay_4691

is i^i a real number?

what is its value?

guys, i think i've got the answer.........but i'd like to get it verified.................

answer i've got:e^( -pi/2)(euler form)

it's a permanent house,,,,,,never dissolved..............

fairly good.........

i too think the answer is 142 mole...........

1 mole of potassium dichromate contains 2 moles of potassium, 2 moles of chromium and 7 moles of oxygen(mono)........

no of electrons in 1 mole of potassium=19 mole

so, no.of electrons in 2 mole=38 mole

similarly, one mole of chromium has 24 moles of electrons

so in two moles we have=48 moles

now, in the same manner, we find the number of electrons in 7 mole oxygen,..........we get 56 moles...........

Total=38+48+56=142 moles...................

i have the diagram,attached................

well, vectors A and B are perpendicular to each other.......the resultant of vectors A and -B is the relative velocity vector.......now, A and -B are also perpendicular to each other so,they make 45 angle with horizontal as well as vertical...........therefore, the tan=mod(-B)/mod(A)=80/60=4/3

where, theta is angle made by the resultant with A...........so, the angle made with A is approx.53..............now, as the angle made by A with vertical is 45, angle made by resultant with vertical=53-45=8

............which, i suppose, is the right answer...............correct me if i'm wrong,..

QUESTION 1

no. of ways of selecting n objects from n identical objects is always 1........now, no . of ways of selecting atleast one object from n identical objects is n....therefore, total no of selections is n+1(including the empty selection)...........now, total no of selections is.......(10+1).(9+1).(7+1)=11.10.8=880.......subtracting the empty selection, we have 880-1=879........which should be the answer...........correct me if i'm wrong