abhijit

1 g alloy of Cu and Zn reacted with excess of H2SO4 gives 60 ml of H2 at STP. What is the % of Zn in the alloy?

a spring balance is tied to a massless inextenxible string a small object of mass 60kg is attached to the hook of the spring balance. this system is now whirled about a vertical axis so that object performs ucm with centripetal acceleration/21m/s^2.thespr...

i think it is c

suppose A=2 B=7 so we can conclude that A*B=2*7=14 A+B=2+7=9 I think there are many numbers which can complete this condition.