I'm really struggling with these can i get some

1. a rubber rod can be charged negatively when it is rubbed with wool. what happens to the charge of the wool?

2. what is electrical power in terms of current and potential difference?

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.