If the resistance of a conductor is 95 ohms at 23 degrees C and 115 ohms at 71 degrees C, what is its temperature coefficient of resistivity

226 Per/ deg c

Explanation:

We know that

Here

R1 =  Resistance at the room temperature = 95 ohms

Rt= Resistance of the final temperature = 115 ohms

T1 = Temperature coefficient  

Putting these value in the previous equation we get

T1=226 per Deg C

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.

see earlier answer