p201f01-exam03

# p201f01-exam03 - Seat Physics P201 D Baxter/R Heinz EXAM#3...

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1. A ventilation fan with a moment of inertia of 0.034 kg-m 2 has a net torque of 0.11 N-m applied to it. What angular acceleration does it experience? a. 5.3 rad/sec 2 b. 4.0 rad/sec 2 c. 3.2 rad/sec 2 d. 1.9 rad/sec 2 e. 0.45 rad/sec 2 2. A merry-go-round has a moment of inertia of 500 kgm 2 and a diameter of 4 meters. It rotates while empty at 1/3 revolution per second. When a parent of mass 125 kg jumps lightly on the rim (without causing any torque) the merry-go- round changes speed. How many revolutions per second does it make after the parent jumps on? a. 5 b. 4 c. 2 d. 1/3 e. 1/6 3. Consider two steel rods, A and B. B has three times the area and twice the length of A. The ratio of the Young’s modulus for A divided by the Young’s modulus for B will be: a. 5.0 b. 3.0 c. 2.0 d. 1.0 e. 0.5

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4. A uniform rod AB is 3 m long and weighs 4 N. It is suspended by strings AC and BD as shown. A block P weighing 24 N is attached at E, 3/4 m from A. The
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p201f01-exam03 - Seat Physics P201 D Baxter/R Heinz EXAM#3...

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