a tank is half full of oil that has a density of 900 kg/m3. find the work w (in j) required to pump the oil out of the spout. (use 9.8 m/s2 for g. round your answer to the nearest whole number.)

Which of the following is an example of an opposing signal? no examplthates given.   i would say, that traffic lights in a city at major intersections direct the flow of traffic in opposite directions so would be an example.also, stop signs on either side of the same street would be an example. at a train crossing, the light for allowing car traffic in opposite directions or not would be another example.