This information refers to the general prevalence and incidence of these diseases, not to how likely they are to be the actual cause of Muscle rigidity. Of the 73 causes of Muscle rigidity that we have listed, we have the following prevalence/incidence information:
the mass of the Earth. Solve for the mass of the Earth: m1 = aR 2/G = _____ kg Questions 1. Why is it a good idea to take many measurements and average the results? 2. Compare your value for the mass of the Earth to the true value of 6 x 1024 kg. That is, calculate the percentage difference: 3. How does your value for the acceleration compare to the actual value of 9.8 m/s2? With this answer in mind, how does your measurement for the acceleration of an object affect your derived value for the mass of the Earth? 4.
Mass is simply how much stuff there is in the object. Weight depends on the strength of the gravitational field the object is in. Lets say you have a brick with a mass of 60 kilograms. On Earth it would weigh 60 kilograms. On the moon, with one sixth the gravity it would weigh only 10 kilograms. But its mass is still the same at 60 kg. Its unfortunate that the units of mass and weight are the same (for metric countries). But it does simplify things when referring to masses in Earth's gravity (mass and weight are the same value on Earth).