You wad up a piece of paper and throw it into the wastebasket. how far will
your piece of paper travel if you throw it with a velocity of 4.3 m/s at an angle
of 65°? (assume no air resistance and that the paper lands at the same
height you threw it from.)

solution,

in this question we have given,

power of motor=150watts

time=8s,

force=15n

we know that,

power=

therefore,

it's called electromagnetic radiation.

radio waves are used in thing like cells phone and radios. they are transmitted to our radio which then use them to make vibrations in our speaker and produce the sound waves we hear.

you can use a symmetry argument to determine the net electric field at the center of the square.

each one of the square's corners is equidistant from the center. you can then argue that the contribution to the field at the center from each charge is equal in magnitude.

you can also argue that, for any charge placed on the square, its contribution to the field can be matched with and canceled out by the contribution from the charge on the opposite corner (e.g. the contributions from the top-left and bottom-right charges will cancel out).