what does einstein’s theory of relatively, which posits that movement in space and time is relative to the person measuring them, mean? check all that apply.
1.each person’s perception is one’s own truth.
2.reality is unique to each individual.
3.space and time are constructs that do not exist.
4.each person perceives space and time differently.
5.what people perceive is not necessarily accurate or true.

The theory of special relativity explains how space and time are linked to objects that move at a constant speed in a straight line.

The correct answers are: 1, 2, 4 and 5.

"Einstein concluded that simultaneity is relative; (4) events that are simultaneous for one observer may not be for another." (1) "This led to the counter intuitive idea that time flows differently according to the state of movement, and the conclusion that distance is also relative."

Another strange conclusion of Einstein's work comes from the understanding that time moves in relation to the observer (2, 5).

they could find out our specific needs.

question - in 1827, john walker, a druggist in a small english town, tipped a splint with sulphur, chlorate of potash, and sulphid of antimony, and rubbed it on sandpaper, and it burst into flame. the druggist had discovered the first friction-chemical match, the kind we use to-day. it is called friction-chemical because it is made by mixing certain chemicals together and rubbing them. although walker's match did not require the bottle of acid, nevertheless it was not a good one. it could be lighted only by hard rubbing, and it sputtered and threw fire in all directions. in a few years, however, phosphorus was substituted on the tip for antimony, and the change worked wonders. the match could now be lighted with very little rubbing, and it was no longer necessary to have sandpaper upon which to rub it. it would ignite when rubbed on any dry surface, and there was no longer any sputtering. this was the phosphorus match, the match with which we are so familiar. according the paragraph what was the benefit of the new phosphorus match? it burst into flame when rubbed on sandpaper. it was made by mixing chemicals. it could be ignited on any dry surface. it threw fire in all directions.

answer - matches required natural chemicals