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Crowbar of 5 metre is used to lift an object of 800 metre if the effort arm is 200cm calculate the force applied

Because light travels in a straight line and casts a shadow, isaac newton hypothesized that light is

Automobile fuel efficiency is often measured in miles that the car can be driven per gallon of fuel (mpg). heavier cars tend to have lower fuel efficiencies (lower mpg ratings). which variable (weight or fuel efficiency) is most naturally considered the explanatory (predictor) variable in this context?