A car jack with a mechanical advantage of 6 needs to produceand output force of 600 N to raise a car. what inout force is required

The answer for #3 is c but i don't know why

What can be found in the ionosphere

If we compare and contrast electromagnetic waves with sound waves, all but one statement is true. that is a) sound waves require a medium to travel while electromagnetic waves do not. b) electromagnetic waves can travel through the vacuum of space while sound waves cannot. c) electromagnetic waves must have a medium in which to travel, but sound waves can travel anywhere. eliminate d) sound waves must bounce off of matter in order to travel while electromagnetic waves do not require matter to be present.