A1 kg object is moving horizontally at 10 m/s when it hits and bounces off of the lower end of a bar hanging vertically at rest. assume kinetic energy is conserved. the bar has a length l of 1.2 m and a mass m of 3 kg and is pivoted about the upper end. immediately after the collision, the object moves with speed v at an angle  relative to its original direction. the bar swings freely and reaches a maximum angle of 90° with respect to the vertical. the moment of inertia of the bar about the pivot is ibar = ml²/3.

when insulating materials rub against each other, they may become electrically charged . electrons , which are negatively charged, may be 'rubbed off' one material and on to the other. the material that gains electrons becomes negatively charged. the material that loses electrons is left with a positive charge.

the amount of current in the coil

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.

this could be newton#'s law of cooling. the cooling curve is exponential