Conifers differ from grasses in the

Two blocks of masses $1 ~kg$ and $2 ~kg$ are connected by a metal wire going over a smooth pulley as shown in the figure. The breaking stress of the metal is $2 \times 10^9 ~N/m^2$. What should be the minimum radius of the wire used if it is not to break? Take $g = 10 ~m/s^2$.

Which one of the following characteristics of the transition metals is associated with their catalytic activity?

The proposition $(p$ $\Rightarrow \;\sim p) \wedge (\sim p$ $\Rightarrow p)$ is a

Which structure acts as the pacemaker of the heart?

Which of the following metals releases hydrogen gas upon reaction with cold dilute $HNO_3$?