A 1.2-kg mass is projected down a rough circular track (radius = 2.0 m)as shown.The speed of the mass at point A is 3.2 m/s,and at point B,it is 6.0 m/s.What is the change in mechanical energy done on the system between A and B by the force of friction?
A)-8.9 J
B)-7.3 J
C)-8.1 J
D)-6.6 J
E)-24 J

Question

A 1.2-kg mass is projected down a rough circular track (radius = 2.0 m)as shown.The speed of the mass at point A is 3.2 m/s,and at point B,it is 6.0 m/s.What is the change in mechanical energy done on the system between A and B by the force of friction? 
A)-8.9 J 
B)-7.3 J 
C)-8.1 J 
D)-6.6 J 
E)-24 J

Quizplus · Accepted Answer

The Answer of A 1.2-kg mass is projected down a rough circular track (radius = 2.0 m)as shown.The speed of the mass at point A is 3.2 m/s,and at point B,it is 6.0 m/s.What is the change in mechanical energy done on the system between A and B by the force of friction? 
A)-8.9 J 
B)-7.3 J 
C)-8.1 J 
D)-6.6 J 
E)-24 J

A 12-Kg Mass Is Projected Down a Rough Circular Track (Radius