Q. An airtight box has a removable lid of area 2.0 10-2m2 and negligible weight. The box is taken up a mountain where the air pressure outside the box is 0.75 x10^5Pa. The inside of the box is completely evacuated. What is the magnitude of force necessary to pull the lid off the box?
Q. An interstellar spacecraft races by the Earth at a velocity of 1.85×108 m/s, as measured by observers on the Earth. The spacecraft's galley cook places a pot of Minute rice on the stove for exactly 60.0 s, according to his watch. How long would pot have been on the stove according to the earthbound observers?