Which of the following cannot be determined from the spectrum of a star? the chemicals in the atmosphere of the star
the motion of the star
the temperature of the atmosphere of the star
the chemicals in the core of the star

All can be determined

Explanation:

The spectrum of star is a graphical representation which the properties of star are observed. From the options above, the spectrum of star can be determined from all of the above. For motion, it can determine the rotational and transnational motion.

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.