Aboy on a skateboard is pushed down the sidewalk by a friend. the skateboard rolls for a while but eventually comes to a stop. what force is causing the skateboard to stop rolling?

You notice a very one-dimensional-thinking snail crawling along one rail of a railroad track. naturally, you remove it to a safer place. but before you do, you observe it as it moves from position xi = -92.9 cm to position xf = -64.9 cm along the rail, as measured from a point where one rail abuts the next. what is the snail\'s displacement δx in centimeters?

Which best represents the law of conservation of mass ?

The necleus of an atom is made up of what subatomic particles?