Find the how much mechanical energy was converted to internal ...

[anjilletteb]

Find the how much mechanical energy was converted to internal energy in the system box-surface-Earth when a box moves in a complete circle of radius on a uniform horizontal floor.
 
  The coefficient of kinetic friction between the floor and the box is 0.25, and the box weighs A) 190 J
  B) 0 J
  C) 1800 J
  D) 370 J

Question 2

A 60.0-kg man stands at one end of a 20.0-kg uniform 10.0-m long board. How far from the man is the center of mass of the man-board system?
 
  A) 1.25 m
  B) 2.50 m
  C) 5.00 m
  D) 7.50 m
  E) 9.00 m

[amynguyen1221]

Answer to Question 1

A

Answer to Question 2

A

[anjilletteb]

Thanks for the timely response, appreciate it

[ryhom]

Wow, this really help