A system comprising two blocks is shown, one of which is on an inclined plane. The pulley is of negligible mass and is frictionless. The system starts from rest at position 1 and accelerates. Measurements taken when the blocks reach position 2 indicate that 1) the kinetic energy of block A has changed by 330 J;
2) the potential energy of block A has changed by 588 J;
3) the kinetic energy of block B has changed by 110 J; and
4) the potential energy of block B has changed by 98 J.The amount of mechanical energy that has been converted to heat because of friction is
A) 12 J
B) 50 J
C) 258 J
D) 478 J
E) 710 J

Question

A system comprising two blocks is shown, one of which is on an inclined plane. The pulley is of negligible mass and is frictionless. The system starts from rest at position 1 and accelerates. Measurements taken when the blocks reach position 2 indicate that 1) the kinetic energy of block A has changed by 330 J;
2) the potential energy of block A has changed by 588 J;
3) the kinetic energy of block B has changed by 110 J; and
4) the potential energy of block B has changed by 98 J.The amount of mechanical energy that has been converted to heat because of friction is
A) 12 J 
B) 50 J 
C) 258 J 
D) 478 J 
E) 710 J

Quizplus · Accepted Answer

The Answer of  A system comprising two blocks is shown, one of which is on an inclined plane. The pulley is of negligible mass and is frictionless. The system starts from rest at position 1 and accelerates. Measurements taken when the blocks reach position 2 indicate that 1) the kinetic energy of block A has changed by 330 J;
2) the potential energy of block A has changed by 588 J;
3) the kinetic energy of block B has changed by 110 J; and
4) the potential energy of block B has changed by 98 J.The amount of mechanical energy that has been converted to heat because of friction is
A) 12 J 
B) 50 J 
C) 258 J 
D) 478 J 
E) 710 J

A System Comprising Two Blocks Is Shown, One of Which