a copper cable has a resistance of 30 at a temperature of 50°c. determine it's resistance at 0°c. take the temperature coefficient of resistance of copper at 0°c as 0.0043/°c​

28. evolution

29. environment, survive, offspring  

explanation:

1/0.14nm = 10^10/1.4 a lot

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.