A lid is put on a box that is 15.0 cm long, 13.0 cm wide, and 8.00 cm tall, and the box is then evacuated until its inner pressure is 0.881 × 105 Pa. Atmospheric pressure is 1.013 × 105 Pa. How much force is required to lift the lid in Seattle , on a day when the atmospheric pressure is 67.5 kPa (2/3 the value at sea level)?

What is the pressure inside the drop of mercury of radius 3.00 mm at room temperature? Surface tension of mercury at that temperature (20°C) is 4.65 x 10 N m. The atmospheric pressure is 1.01 x 10° Pa. Also give the excess pressure inside the drop.

At a given instant, the blood pressure in the heart is 1.4 x 10^4 Pa. If an artery in the brain is 0.49m above the heart, what is the pressure in the artery? Ignore any pressure changes due to blood flow.

During a very severe storm, wind blows past a window surface (parallel to the window surface) at speed 15 m/s.  Assuming the air inside the window is still, find the pressure difference between the air inside and outside the window.  Is the pressure higher inside or outside the window?  Assume the density of air is 1.2 kg/m3.

An automobile weighing 1.19 x 104 N has weight equally distributed over its wheels. The weight of the car causes each tire to be slightly flattened on the bottom so that there is a surface area in contact with the road. The gauge pressure of the air in the tire is 1.90 x 105 Pa (27.55 lb/in2). Find the area of contact, assuming that the only forces on the section of tire in contact with the road are the air pressure and the normal force exerted by the surface of the road. (The answer is not 0.06263 m2)

Part A -  A cube of volume 3.0 ×10-3 m3 (3.0 L) is placed on a scale in air. The scale reads 267 N. What is the material?     Answers: Copper, ρ = 8.9 × 103 kg/m3   Aluminum, ρ = 2.7 × 103 kg/m3   Gold, ρ = 19 × 103 kg/m3   Lead, ρ = 11 × 103 kg/m3   Part B - An aluminum block of volume 200 × 10-6 m3 is held by a string at rest in oil as shown. ρAL = 2700 kg/m3, ρoil = 900 kg/m3, and g = 10 m/s2.  Now the same block is placed in water, still completely submerged. Water is more dense than oil. The net force on the block will  ______.       Answers: decrease   increase   stay the same   Part C -  Now the same block is placed in water, still completely submerged. Water is more dense than oil. The buoyant force on the block will  ______.       Answers: stay the same   decrease   increase   Part D -  Now the same block is placed in water, still…