A hollow cylindrical copper pipe is 1.70 m long and has an outside diameter of 3.60 cm and an inside diameter of 2.10 cm. For related problem-solving tips and strategies, you may want to view a Video Tutor Solution of The weight of a roomful of air.

A vertical, frictionless piston-cylinder device contains a gas at 600 kPa absolute. The atmospheric pressure outside is 100 kPa absolute. The piston has a diameter of 50 mm. a) Determine the mass of the piston. b) If the mass of the piston is now halved ---- what would be the gauge pressure of the gas?

Bacteria have a density that is about the same as water. Their average velocity is 10^-3 m/s. A bacterium with a radius of 1 um should have a diffusion coefficient of about 2.2x10^-13 m^2/s. (a) Find the random-walk step size (b) How long does it take for an average walk to reach 1 mm in seconds and days? Note that we are considering the diffusion away from the starting point and are calculating the distance through three dimensions. Show your work

Your dorm has an amateur hour every Friday night. Since you have a tremendous lung capacity, you challenge everyone to a lung capacity competition which is conducted by blowing air through one straw which in turn pulls water up through another straw, as shown in the figure. The straws are identical and have a diameter of 0.58 cm, you are able to exhale 1.4 liters of air through the horizontal straw in as little as 2 seconds, and the density of air is 1.29 kg/m³. Determine the following. (a) speed of the air as it travels through the horizontal straw m/s (b) height to which water rises in the vertical straw cm