39 - A,C
42 - A,B
44 - D
32 - 1.60
PLEASE HIT LIKE IN CASE YOU TRY, THANKYOU.
Let P,Q be (2,0) and (-2,0) and consider a line ax+by=1 and write eqns. for distance (note that they are on same side, so their signed distances(without mod) can be directly added)
so these type of question are always solved like this.
hey brother but the question is further concerned about a fixed circle and i am uanble to comment on circle, plz help.
the equation you get is also the distance of the line from a fixed point.
thankyou brother, i got it
for Q no. 32, during electrolysis of NaCl, reaction at cathode is 2H2O + 2e — H2 + 2OH-
pH=12 means [OH-] = .01 M, volume is 80 ml, so OH- = 0.8 mmol. According to reaction, 1 mole e- i.e. 1 F charge produces 1 mol of OH-, so 0.8 mmol OH- requires charge = 0.8 milli farad. use Q=It to find time(x=8 sec). For CuSO4, reaction at anode is 2H2O — O2 + 4H+ + 4e. No. of moles of O2 at STP = 0.28/22.4 = 0.0125. Acc. to rxn., for 1 mol O2, charge required is 4 F. So for 0.0125 mol O2, charge required will be 0.0125x4=0.05 F. Again use Q=It. t will be 5 sec(y).
So x/y = 8/5 =1.6. hope this is the correct method
Put values cancel terms from num and deno then multiply and divide by x²-1 ans solve it…
ok brother ill try
Means area of BCD