A lid is put on a box that is 14 centimeter long, 18 centimeter wide, and 8.0 centimeter tall and the box is then evacuated until its inner pressure is 4.6 x 104 Pa.
(a) Find how much force is required to lift the lid at sea level?
(b) Find how much force is required to lift the lid in Denver on a day when the atmospheric pressure is 67.5 kPa (2/3 the value at sea level)?