How is density of sand calculated by using water?Describe in brief.
A glass doesnot immerse in water when dipped straight downwards. Why?
What is effort arm?
plz answer it..

Density of sand calculated by using water given below.

A glass doesnot immerse in water when dipped straight downwards is explained in the following way

Explanation:

in this image, you can see solar radiation going through ocean water.

no image, but probably absorption

the box does not move because you need to use a force greater than 300 n. you are only using 50 n. it needs to at least be 301 n for the box to move because then it is an unbalanced force and it will move the way that the greater force is pushing it. if you use only 300 n it will be a balanced force and will not move because the force you are exerting on the   box is the same as its force.

hope this !

im sorry if i went too in depth, i am going to include a link to a video on khan academy that will explain this.   hope that you like the video and that it explains more in detail to you.

that is the link.