Final Exam Solutions

The magnitude of the force acting on the particle is

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Unformatted text preview: value of M must be known to answer this question. [V] Consider a solid disc, a ring, and a solid sphere each of radius R and mass M roll down from rest without slipping from the same height on an incline. Which one will reach the bottom of the incline first? [a] the ring [b] the disc KErot. and largest KEtr) [c] the sphere. (Has the lowest I and hence smallest [VI] The potential energy function U(x) as a function of distance, x for a particle is as shown. The magnitude of the force acting on the particle is the largest when the particle is C at: [a] A [b] B (highest slope, dU/dx) B [c] C U(x) A X(m) Prob. 2 (20pts)Two crates of masses m = 50.0kg and M = 150.0kg connected by a rope are being pulled up an incline by a force F parallel to the incline as shown in the diagram. The rope connecting the crates will break if the tension T in it exceeds 625.0N. The coefficient of kinetic friction between the crates and the incline surface is µ = 0.25. (Note: use g = 10m/s2) F M m g 37o [a] (10 pts). Draw free ­body force diagrams for each of the two masses. T N2 N1 F M m T Ff 500si n37 37o Ff ’ 50 0cos37 500.0N 37o 1 5 0 0co s3 7 1 5 0 0.0 N [b] (4 pts). Write down equations ΣF = ma for each of the two mass...
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This note was uploaded on 07/13/2013 for the course PHYS 101 taught by Professor Goldberg during the Summer '08 term at Drexel.

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