A film company is filming a documentary. The video camera runs out of batteries. The camera draws 0.25 Amps of current, and has an overall resistance of 72 Ohms. What voltage supply does this camera need - will your last 6 pack of 9V batteries do the job?

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