Fluids flow and exert forces on objects.

The force acting on a beam was measured under the same operating conditions and a sample of 5 data points was collected. this process was repeated by 3 observers. the pooled standard deviations of these 3 data sets was 1.21. determine the true mean force using all pooled data (with a 95% probability). the result should look like this: true mean = mean +/- margin of error

If the chemical properties of a substance remain unchanged and appearance or shape of a substance changes it is called a ?

The radius of an atom is closest in size to a