# Question: Name the two types of external forces

Name the two types of external forces recognized in mechanics and give an example of each.

## Answer to relevant Questions

A huge boulder is inadvertently cast high into the air during an open pit mine blast. Using the definition of mass center and Newton’s second law of motion, show that the center of mass of the boulder travels the same path ...Let be a continuous real-valued function on the unit circle {x € R2 : |x| =1} such that f (0, 1) = g(1, 0) = 0 and g(- x )= - g(x). Define f: R2→R by F (x) = {|x| . g (x/|x| x ≠0, 0 x = 0. (a) If x € ...Find f1 for the following (where g: R → R is continuous): (a) f (x, y) = g (b) f(x, y) = g (c) f(x,y,z)=f (x,y) = xxxxx = (log (x))(aretan (aretan(sin(eos(xy)) – log (x + y ))))),Let f be defined as in Problem 2-4. Show that Dxf (0, 0) exists for all , but if g ≠ 0, , then Dx + yf (0,0) =Dxf (00 Dx + y f (0, 0) = Dx f (0 , 0) + Dyf (0, 0) Is not true for all x and all y.Post your question