Guys please I need your help with this one. A copper refining cell of resistance 0.00072 ohms has an electrochemical equivalent of 0.000000329 kg per Coulumb. calculate the potential difference that would provide a constant current for 60 seconds so as to deposit 0.48kg of copper.

Water is siphoned from a large tank and discharges into the atmosphere through a 50-mm diameter tube. the end of the tube is b = 2.6 m below the tank bottom which is a = 6.7 m deep, and viscous effects are negligible. determine the maximum height h over which the water can be siphoned without cavitation occurring. atmospheric pressure is 101.4 kpa, and the water vapor pressure is 1.79 kpa (absolute). report your answer in meters to two decimal places.