Student measured the length of a metal piece and found it to be 23.1 cm. The actual length of the piece of metal is 22.0 cm. Answer the following questions:
a) Calculate the error in the length of metal.
b) Calculate the percentage error in the length.

The famous scientist galileo galilei did several experiments with sloping planes, which he rolled metal balls down so that he could study motion. by changing the slope, he could study how the speed at which the ball rolled was affected. what was the independent variable in galileo's experiment? a. the speed of the ball b. the slope of the plane c. whether the ball moved d. what the ball was made of