1) Airplane travelers sometimes note that their cosmetics bottles, toothpaste tube, and other containers have leaked through a flight (when flown in cargo hold- checked baggage) what may cause this?
2) When blood pressure is measured, why should the blood pressure cuff be held at the level of the heart?
3) A submerged can of "cola" will sink, however a can of “diet cola" will float. Describe.
4) A barge filled high with sand approaches a low bridge over the river and cannot quite pass under it. must sand be added to , or removed from the barge?
5) Long steam pipes that are fixed at the end often have a section in the shape of a U. WHY?