Consider a ball standing in the bed of a pickup truck, which is coated with ice. You can consider the force of friction between the ball and the truck to be zero. The truck is initially at rest, and then accelerates to the right, moving along a flat road. As seen from a stationary observer (watching the truck move to the right), the ball: 1) moves to the right at the same rate as the truck, so it doesn't slide moves to the right, but not as quickly as the truck is moving to the right, causing it to slide towards the back of the truck moves to the left, as the truck moves to the right, causing the ball to slide towards the back of the truck.
2) does not move left or right, but the back of the truck moves towards the ball.

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.

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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.

im sorry i dont know

energy stored in the capacitor= 9.72 x 10⁻⁴ j

explanation:

the energy stored in the capacitor is given by

e= 1/2 c v²

e= energy stored

c= capacitance= 1.5 µc= 1.5 x 10⁻⁶f

v= potential difference=36 v

so energy stored= e= 1/2 (1.5 x 10⁻⁶) (36)²

energy stored= 9.72 x 10⁻⁴j

answer is slate

hope this