List the contributions of marie curie​

Marie Sklodowska Curie (1867–1934) was the first person ever to receive two Nobel Prizes: the first in 1903 in physics, shared with Pierre Curie (her husband) and Henri Becquerel for the discovery of the phenomenon of radioactivity, and the second in 1911 in chemistry for the discovery of the radioactive elements ...

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.

grav force prop 1/r squared 2r all squared is 4rsquared 1/4rsquared quartered