How many 190W lightbulbs can you use in a 180-V circuit without tripping a 8-A circuit breaker? (The bulbs are connected in parallel, which means that the potential difference across each lightbulb is 180V. Also
calculate the resistance of the 190W lightbulb.
(a) No. of 190-W lightbulbs we can use without tripping a 8-A circuit breaker=
(b) Resistance of 190W lightbulb in ohm =​

Suppose that a cylindrical tank 6 meters high with a radius of 2 meters is filled to the rim with water. the tank is buried so that the top of the tank is 1 meter below ground level. the space above the tank is not filled with water. calculate how much work needs to be done by a pump to pump the water out of the tank up to ground level. (the water weighs 9,800 newtons per cubic meter.)