Which is the most important center for lymph formation?

The active mass of $64 \ g$ of $HI$ in a $2 \ L$ flask is:

Thermite is a mixture of $X$ parts of ferric oxide and $Y$ parts of aluminium powder. What are $X$ and $Y$ respectively?

$\int_0^2 \frac{2x-2}{2x-x^2} dx$ is equal to

One end of a string of length $l$ is connected to a particle of mass $m$ and the other to a small peg on a smooth horizontal table. If the particle moves in a circle with speed $v$ and $T$ is the tension in the string,then the net force on the particle (directed towards the centre) is