Newton's law of gravitation is , where is the force between two objects, and are the masses of the two objects, is the universal gravitational constant, and is the distance between the two objects. by knowing information about the size of the earth and making a few measurements, this formula can allow you to determine the mass of the earth. solve this equation for .

Ascientist wants to use a model to present the results of his detailed scientific investigation. why would a model be useful? a )because the model makes the concepts easier to understand b) because the model is easy to put together and to use c) because the model prevents other scientists from asking questions d) because the model requires the audience to pay full attention to it i don't know what to choose because between a and d a is much more likely than d because it only wants to get the attention of the audience. i'm confuse.