When a ceiling fan is switched off,its angular velocity falls to half while it makes $36$ rotations. How many more rotations will it make before coming to rest? (Assume uniform angular retardation)

Nitrobenzene on reduction with zinc and $NH_4Cl$ gives

In land plants,the guard cells differ from other epidermal cells in having:

$A$ fire hydrant delivers water of density $\rho$ at a volume rate $L$. The water travels vertically upward through the hydrant and then makes a $90^o$ turn to emerge horizontally at speed $V$. The pipe and nozzle have a uniform cross-section throughout. The force exerted by the water on the corner of the hydrant is

If $A$ and $B$ are any two events,then $P(A \cup B) = $