Which of the following statements does not describe the structure of an atom? a. an atom has a small, dense center called the nucleus. b. inside the nucleus of an atom are protons and electrons. c. protons are positively charged sub-atomic particles. d. electrons are negatively charged sub-atomic particles.

Avertical clean glass piezometer tube has an inside diameter of d = 1 mm and is used to measure pressure in a horizontal pipe carrying water as shown. due to pressure in the pipe, the water at 20c rises into the tube to a height h. if the water pressure in the pipe is p = 500 pa gauge, estimate the height h: (a) without considering surface tension (b) with surface tension (capillary) effects. the contact angle  can be assumed at 30 deg