An electron in a magnetic field moves along a circle with a radius of 40.4 m with a speed that follows: v(t) = v0 e^-bt
where b = 0.73 s^-1 and v0= 445 m/s.
What is the angular acceleration at t= 3s?

this means that the temperature of both substances will be equal

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.