Discuss the following:
Tension, work done and increase in internal energy
Q: A sledge loaded with bricks has a total mass of 18.0 kg and is pulled at constant speed by a rope. The rope is inclined at 20.0° above the horizontal, and the sledge moves a distance of 20.0 m on a horizontal surface. The coefficient of kinetic friction between the sledge and surface is 0.550.
(a) What is the tension in the rope?
(b) How much work is done on the sledge by the rope?
(c) What is the increase in internal energy in the sledge and the surface due to friction?