Some electrons are added to a lead sphere with a mass of 14.5g. Its net charge becomes 3.8nC. How many electrons were added to the sphere?
Fresh water travels through a pipe of varying width from point A to point B. At point A the velocity of the water is 5.1m/s, at point B the velocity of the water is 13.0m/s. What is the difference in pressure between point A and B?