Question

4. If you had a ruler and some string, how would you determine the radius of a ball? Part I: Experimental measurements 5. Using a ruler, measure and record the length, width, and height of your object in centimeters. Make three measurements of each (use the same object), measuring at a different point along the object. Do not forget the experimental uncertainty. Hint: for uncertainty, what is the smallest division on your ruler? 1 2 3 Units Exp. Uncert. Length Width Height

Instructions:

For this lab, you need a metric ruler or a metric measuring tape. If you don’t have either, you can print one from the internet, or download a ruler app on your phone. You also need something relatively small and rectangular(something that is easy to find at home). Some ideas: large rectangular eraser, box, book, a loaf of bread, a Tupperware container, a binder, etc. If the object is not exactly rectangular, estimated average dimensions.

Answer 1

4) Placing string on the circumference of ball and then measuring the string by the ruler, and then dividing the value by 2π, one will get the radius.