Answer Happy

thig Cred d m₂ JAK h www.ignoree break Part A (Dynamics) m₁ A barrel with building bricks (mass m₂) is initially held in place by a rope attached to a wall. Mr. Paddy Murphy (mass m₁), confident in his powers and forgetting basic physical principles, thinks he can hold the barrel and has just untied the rope (see picture). Since m₂>m₁, the assembly will begin to move. The barrel moves down through distance h, Mr. Murphy moves up through distance h, and the frictionless pulley (mass M, radius r, solid cylinder) spins (no slipping). m₁=65kg m₂=130kg M=60kg r=0.5m h=45m

Part B (Energy) You will now find the speed with which Mr. Murphy's head hits the pulley, but this time you will use conservation of energy instead of dynamics. The figure shows a 'before; (case A) and 'after' (case B) picture for the problem. Before A AF3 WAFO Уга-я M₂ N₂A=0 №₂B "I J₁B=h M₁ J₁A=0 V₁A=0 та У28=0 a. Use the figure above and conservation of energy to find the speed with which Mr. Murphy's head will hit the pulley. Are you getting the same answer as in part A (using dynamics)? No explanation necessary for this page: b. How would Mr. Murphy's speed right before hitting the top be affected if the pulley's mass M were bigger? 1. it would be the same 2. It would be greater 3. It would be smaller c. How would Mr. Murphy's speed right before hitting the top be affected if the pulley's mass were concentrated on the rim (same radius)? 1. it would be the same 2. It would be greater 3. It would be smaller d. Which is correct for the tensions T₁ (Mr. Murphy's side) and T₂ (barrel side) during the motion? 1. T₁>T₂ 2. T₁<T₂ 3. T₁=T₂ 4. Need more info. M m, D