Phys211Final Exam Sample 1

# Phys211Final Exam Sample 1 - P211 Spring 2004 Form A 1 A 2...

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P211 Spring 2004 Form A 1. A 2 kg block A traveling with a speed of 5 m/s as shown collides with a stationary 4 kg block B. After the collision, A is observed to travel at right angles with respect to the initial direction with a speed of 2.5 m/s. What is the magnitude of the impulse given to B by A ( in kg m/s)? A. 4.0 B. 11.2 C. 16.3 D. 25 E. 0 2. A 2.0 g coin is placed on a flat, horizontal turntable. The turntable is observed to make three revolutions in 3.0 s. The coin is observed to slide off the turntable when it is more than 8.0 cm from the center of the turntable. What is the coefficient of static friction between the coin and the turntable? A. 2.90 B. 1.32 C. 0.899 D. 0.322 E. 6.45 x 10 -4 Page 1

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P211 Spring 2004 Form A 3. A flying saucer deep in interstellar space, free of external forces, rotates about its symmetry axis with angular velocity ω . The aliens inside the saucer rearrange the furniture to make room for a Christmas tree they have just procured from Elvis. As a result, the angular velocity of the saucer decreases to ω /2. If originally the rotational kinetic energy of the saucer was K, after the rearrangement its new rotational kinetic energy is: A. K/4 B. K/2 C. K D. 2K E. 4K 4. A disk of radius r and mass M has a moment of inertia given by I = 1/2 Mr 2 for rotations about an axis through the center of the disk as shown. If a second disk of twice the mass and half the radius is added as shown in the figure, the new moment of inertia of the combined disks is: R/2 R A. 3/4 Mr 2 B. 7/8 Mr 2 C. Mr 2 D. 5/4 Mr 2 E. 3/2 Mr 2 Page 2
P211 Spring 2004 Form A 5. Find the net torque on the wheel shown below about the axle through O if a=10 cm and b=25 cm? (A clockwise rotation is negative) a b O 12 N 9 N 10 N A. 1.2 Nm

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Phys211Final Exam Sample 1 - P211 Spring 2004 Form A 1 A 2...

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