Two metallic rod of the same material but of different length are heated. smaller rod has
circular area of cross-section but larger rod has rectangular cross-section. will their linear expansivity be the
same or different? give justification of your answer.

What are similarities and differences between refraction, reflection, diffraction and absorption?

Select all of the following that are equal to an impulse of 20 unitsa) force= 5, time= 5.5b) force= 25, time= 0.8c) force= 0.1, time= 200d) force= 10, time= 2(its b, c, and d)(also in order to find answer they have to add to get the unit)ex= 25x.8=20 or .1x200=20

Chemical energy is a form of energy. a. heat b. kinetic c. potential d. electromagnetic