A student in an experiment has set up standing wave patterns in a vibrating string, as shown in the figure. The frequency of the wave is produced by a frequency generator and is constant. The student then decreases the tension in the string until the next allowed standing wave pattern forms. What statement is true about the new standing wave compared to the current one?

Explanation:

The frequency of the wave in the stretched string is directly proportional to the square root of tension in the string. As the tension decreases, so the frequency of the wave in the string decreases.

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.

conduction, convection, radiation