What kind of energy transformation happens when a boy uses energy from a sandwich to run a race

The y form of iron is known as: a) ferrite b) cementite c) perlite d) austenite

The force on a cutting tool are 2600n vertically downward and 2100 horizontal. determine the resultant force acting on the tool and the angle at which it acts.

Thermal stresses are developed in a metal when its a) initial temperature is changed b) final temperature is changed c) density is changed d) thermal deformation is prevented e) expansion is prevented f) contraction is prevented