30. a student correctly determined the
density of two rocks. if the volumes of
the two rocks are equal, the rock with
the greater density has a
a. rounder shape
b. smoother surface
c. greater mass
d. smaller size

C

Explanation: Density= mass/volume

if dividing by same volume, need to increase mass in order to increase density.

same as 4=8/2 vs 8=16/2

increase numerator= increase in answer

the most reliable source of information.is wikipedia

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.