Please download the file https://anaraven.bitbucket.io/eval/2018/cmb1/grav/answers.Rmd. Write your student number in the correct place at the beginning of the answer file. When you finish, send the answers.Rmd file to andres.aravena+cmb@istanbul.edu.tr. Be sure to use the correct email address and send only one file.

# 1 Rubber bands

Coils and rubber bands are elastic materials. If you apply a force to them, they expand. If there is no force, they have a natural size. We want to investigate what is the relation between the expansion of the elastic material and the force applied to them?

Today we will measure the relationship between the weight of the load and the rubber band’s length with an experiment like this:

## 1.1 Measure the rubber band length for different numbers of coins (or marbles). Write the values in a text file called rubber-band.txt.

After you finish, repeat the experiment one or more times. There should be three columns: n_coins (or n_marbles), length, and repetition. Send this file to andres.aravena+cmb@istanbul.edu.tr.

# 3 Homework

These exercises will take more time. Do them at home and send me the answer in a separate file (on Rmarkdown format).