Draw a labelled diagram to show water cycle in nature.

In which class would you place any organism which has:

Skeletons are made of both bones and cartilage and are cold-blooded.

Starting from a stationary position, Anil paddles his bicycle to attain a velocity of $10 \mathrm{m} {\mathrm{s}}^{-1}$ in the $25 \mathrm{s}$. Then he applies brakes such that he again comes to rest after next $50 \mathrm{s}$. Calculate the acceleration of the bicycle in both cases. Also, find the total distance covered by Anil.

Calculate the number of atoms in 

(i) 52u of He

Calculate the number of atoms in 

(i) 52 g of He