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(PHYS011)[2010](f)quiz~2906^_10530.pdf
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Name: ________________ ID: _________________
PHYS 011, Quiz 1
Estimated time: 1:30 C 1:55 pm Sept. 24, 2010
1. (4 points) Two blocks, m1 and m2, are connected via a cord of negligible mass on inclined planes with angle 1 and 2 respectively, see the figure. The pulley is frictionless and has negligible mass.
a. What is the tension in the cord if the inclined planes are frictionless?
b. If m2 is sliding downward, what is the tension in the cord if the inclined planes have a friction coefficient ?
2. (6 points) An object of mass m1 is tied to an object of mass m2 with String 1. The combination is swung in a vertical circular path on String 2 (in the gravitational field). During the motion, the two strings are collinear at all times as shown in the figure. At the top of its motion, m2 is traveling at v.
a.
What is the tension of String 1 at this instant?
b.
What is the tension in String 2 at this instant?
c.
If the combination is rotated faster and faster, and a string is broken at the top, which string is broken? (A) string 1 (B) string 2 (C) depending on v, m1 and m2.