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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 22000Ns
(C) 37000 Ns
(D) 48000 Ns 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  Ns (loss)
ONs' (C) 25 NS (gain)
(D) 1300 NS (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 Nms
(C) 113 Nms
(D) 1% Nmj 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 lag1112
(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.
 Spring '11
 Khajah

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