A force called the effort force is applied at one point on the lever in order to move an object, known as the resistance force, located at some other point on the lever
The Mr is the mass numbers of each element added up so…. Fe = 56, O=16, H=1 … now add these up with the number of each element -> there’s 1 Fe, and 3 Os and 3 Hs as they are in brackets with a 3 outside-> (56+16+16+16+1+1+1=107) … your answer is 107
The only logical answer is A
The material needed to stop a beta particle is c. thin pieces of wood.
