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# fequiz5 - lwg 1 The rotor of a stem turbine is rotating at...

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Unformatted text preview: lwg 1 . The rotor of a stem turbine is rotating at 7200 rev/min when the steam supply is suddenly cut off. The rotor docelerates at; a constant rate and comes to rest after 5 min. What was the angular deceleration of the rotor? (A) 0.40 rad/s2 (B) 2.5m 82 I 5.8 rad,s D) ‘16 rod 3 2 . A flywheel rotates at 7200 rev / min when the power is suddenly cut off. The ﬂywheel decelerates at a. com stant rate of 2.1 rad/s2 and comes to rest 6 min later. How many revolutions does the ﬂywheel make before coming to rest? (A 18000rev 2200011: 4 (C) 72000 rev (D) 390000 rev J. A Spring has a constant 01 50 51/11]. The spnng IS hung vertically, and a mass is attached to its end. The spring end displaces 30 cm from its equilibrium position. The same mass is removed from the ﬁrst spring and attached to the end of a second (different) spring, and the displacement is 25 cm. What is the spring constant. of the second spring? (B) .56 N/m (C) 60 N/m (0) 63 N/m 4 . A czmnonball of mass 10 kg is ﬁred from a cannon of mass 250 kg. The initial velocity of the Cannonball is 1000 km/h. All of the cannon’s recoil is absorbed by a spring with a spring constant of 520 N/cm. What is the maximum recoil distance of the cannon? (A) 0.35m (B 5' m (D 0.92m 5 . A car with a mass of 1530 kg tows a trailer (mass of 200 kg) at 100 km / 11. What is the total momentum of the car—trailer combination? (A 4600 *0. B 22000N-s (C) 37000 N-s (D) 48000 N-s 6 . A car is puiling a trailer at 100 km/h. A 5 kg cat; riding on the roof of the car jumps from the car to the trailer. What is the change in the cat’s momentum? A - N-s (loss) ON-s' (C) 25- NS (gain) (D) 1300 N-S (gain) 7. A 2 kg mass swings in a vertical plane at {he end of a 2 m cord. When 9 a 30°, the magnitude of the tangential velocity of the 111335 is 1 m/s. What is the tension in the cord at this position? (A) 18.0N (B 19. V (D) 29.4 N ‘8. A 2 kg mass swings in the horizontal plane of a circle of radius 1.5 m and is heid by a taut cord. The tension in the cord is 100 N. What is the angular momentum of the mass? (B) 26.0 N-m-s (C) 113 N-m-s (D) 1% N-m-j 9. A 1 kg uniform rod 1 m long is suspended from the ceiling by a. frictionless hinge. The rod is free to pivot. What is the product of inertia of the rod about the pivot point? (A) 0 lag-1112 (B 0.045 _, D) 0.33 km? .mQ 10. A hockey puck traveling at. 30 km/h hits a massive wall at an angle of 306 from the wall. What. are its ﬁnal velocity and deﬂeclzjon angle if the coefficient of restitution is 0.63? (A 9.5 km h at 30“ ' 19 r (C) 28 km/h at- 20° W 229° ...
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## This note was uploaded on 03/29/2011 for the course MET 120 taught by Professor Khajah during the Spring '11 term at Old Dominion.

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fequiz5 - lwg 1 The rotor of a stem turbine is rotating at...

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