Donald's living room is home to a wireless internet router, a television, an FM radio, and the family's cell phones. Donald knows all of those devices use the same type of waves to communicate, and that waves can cause interference with other waves. How do all of the devices still work while
in the same room?
A Each type of device uses waves of different amplitudes, so there is no interference
B Only the router receives its signals over the air, so there is no interference.
C Each type of device uses waves of different frequencies, so there is no interference.
D Only the television receives its signals over the air, so there is no interference.

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.

blue light is scattered in different directions by the tiny molecules of air. blue is scattered more than other colours because it has a shorter distance to travel which results in smaller waves. this is why we see a blue sky most of the time.