Why does the nose of some people start bleeding when an aeroplane climbs up suddenly?

Why does nose start bleeding on high mountains?

Why does the colour of copper sulphate solution change when an iron nail is dipped in it?

Why does the horse rider fall forward when a horse at full gallop stops suddenly ?

Why does the horse rider falls forward when a horse at full gallop stops suddenly?

Why does the horse rider falls falls forward when a horse at full gallop stops suddenly ?

Why does an athlete run some distance, before taking a long jump?

Why does a piece of ice when touched with hand, appear cool? Explain

Why does the pH of an acidic buffer remian constant even when a few drops of a strong acid are added to it?

A pilot does not fall down when his aeroplane loops the loop. Why ?

Why does the skin of your finger shrink when you wash clothes for a long time?