The sled in the diagram is pulled forward at constant speed, 10.0 m along a horizontal surface. Some species of spider are able to live underwater by carrying an air supply with them in the form of a bubble of air. However, it is observed to rise 3.0 times as high in a capillary tube as pure water in a capillary tube of the same diameter. The pressure gradient in each small vessel is the same as that in the large one. Cannot be determined from this information.
Water flows as an ideal fluid through the tube as shown.
The diameter of the upper portion of the tube is twice that of the lower portion of the tube. The gauge pressure in the upper portion is 600 Pa while that in the lower portion is zero. You are investigating pulsatile flow in a blood vessel of a small animal with a heart beat of 3.0 s -1 . The radius of the blood vessel is 0.10 cm and there is a flow of 0.40 cm 3 with each beat of the heart. The flow diagram is shown to the right.