Hi everyone .There is a question for you .
1. why is the density of ice is less than water ??
ans;- due to the cage like structure of ice , molecules are not closely packed and vacant spaces are left . as ice melts,these molecules come closer and hence the density increases. as ice being less denser ,it floats over the surface of water .

2. Why density of water is max at 4 * C ??
ans;- as the ice melts , molecules comes together and hence density increases upto 4*C .After that the kinetic energy of the molecules increases so they start moving away from each other and again density starts decreasing .

Hi everyone . There is a question for you all 
2. On a 200 km track , a train travels the first 50 km at a uniform speed of 40 km/h. how fast the train must travel the next 150 km so as to maintain the average speed of 60 km/h for the whole journey.

Hi everyone . This is a question for you :)

1. Dev sharma a student while going to school in a bus , observes the average speed of the bus to be 20km/h. on the return of the trip of the same way he observes its speed to be 30km/h. find the average speed of the bus in the entire journey . 

MY INTRO

hai everyone i am varun . if you know me then it is good but if not then you have done a mistake . so,what its never too late now you will know me . i am an AAKASHIAN boy. it means that i goes to aakash institute . and never challenge me . enjoy friends i will post the assingments and you can take print out and you can do it .

SAY'YO BRO'

1. hai everyone 
2. i am varun .
3. do u know me .
4. thanks for coming.