Which is denser, ice at 0 degrees c or water at 4 degrees c

a. the water
b. the ice
c. they both have the same density

Water at 4 degree celsius will have higher density.

Option A

Explanation:

Density is related to the ratio of mass and volume. When the water is cooled or heated, it expands. When it is cooled below 4 degrees, due to thermal expansion, the hydrogen bonds will be stronger and the water expands. When it expands there is an increase in the volume which makes the density to reduce.Hence in crystal formation, the density of water will reduce.

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.

f is prop to m1xm2 double m1 double force