Question-

Energy-Interaction Model 

can an energy system contain a certain amount of heat? Describe.

Question-

A triangular block is wedged between a wall and the ground. On top rests a square block attached to the wall by a rope. On top of the square block lies a trapezoidal block. The square block has mass m while both the triangular and trapezoidal block have mass 2m. Friction is present only between the surface of the square and trapezoidal block.

(a) Treating each block as a point particle, draw a free-body-diagram for all three blocks. Scale each force vector relative to each other. 

(b) Identify all Newton's third law force pairs. 

(c) Find an expression, in terms of the wedge angle θ, for the coefficient of friction that would just barely keep the trapezoidal block from sliding.

(d) Find an expression for the tension in the cable as a function of θ and m. 

(e) what is the normal force of the ground on the triangular block? (f) What is the normal force of the wall acting on the triangular block?