Which statement best describes why a machine is useful? a machine does a greater amount of work than the amount of work that is done on it. a machine does a smaller amount of work than the amount of work that is done on it. a machine can decrease both the input force and the input distance needed to do a given amount of work. a machine can decrease either the input force or the input distance needed to do a given amount of work.

The correct answer is A machine can decrease either the input force or the input distance needed to do a given amount of work. Hope this helps! :)

Machine is simply a device that makes our work easier and this can be done by either decreasing the input force or the input distance.

Explanation:

As we know that, Work = Force × distance. So, force and displacement (distance) are inversely proportional to each other.

Work Input = Input force × Input distance

Work Output = Output force × Output distance

Here the Output Work is not greater than the Input Work, but to make the task easier we increase or decrease input force, input distance, output force, and the output distance.

the duration of a photographic flash is related to an rc time constant, which is 0.100 μs for a certain camera.

as we probably am aware that our atmosphere or air have various levels, each level has different gasses, and each gas has another porousness. at the point when the light originates from lower porousness to higher penetrability, it alters its course. with the goal that implies that when the light originates from the moon to the earth, it alters it's course a lot more occasions. it essentially implies that the state of the light piece of the moon is changed on the earth.

not copied too! hope this !

joke:

h o h o hope you have a merry christmas!