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  • Where does the effort go?

    Let's say I weigh 200lb and I'm laying flat on my stomach on the ground and somebody picks me up. I then reach down and pick up a 50lb weight. Now I'm doing the work to lift 50lbs and somebody is doing the work to lift 250lbs. 50 + 250 = 300lb but there is only 250lb being suspended. Is 300lb of effort being exerted to only lift 250lb off the ground?

    3 AnswersPhysics8 years ago
  • How fast is the speed of gravity?

    If the sun instantaneously disappeared it would take about 8.5 minutes until the last light reached Earth. How long after the sun disappeared would the Earth leave its orbit and fly out into space? Instantly? or 8.5 minutes?

    1 AnswerPhysics8 years ago