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Unformatted text preview: 1. A ladder which weights 800 N is leaning against a wall. The length of the ladder is
5.0 m, and the center of mass of the ladder is at its center. The base of the ladder
is‘3.0 m from the wall. Assuming that the wall—ladder Contact is frictionless, what is
magnitude of the force of the wall on the ladder? (Note: the ladder is stationary, since there is friction at the ladder—ﬂoor contact.) D , FT N E Tﬂg— (A) (vi—I6 // f d g 7.745
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ch _ constant torque 'r = 2.0 N In is applied continuously for 10 3. What is the magintude of the angular velocity of the disk at the end of the 10 s? W
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around is spinning with angular velocity we and a child of mass m is standing at the
rim a distance R from the center (i.e., from the axis of rotation). When the child moves
to the center, the angular velocity of the merrygo—around is: Us safe, cm 54am mﬂonf 0F Awe own? WWW/7”": (a) we ,1. n A. U.
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of contact of the top with the ﬂoor, causes the angular momentum of the top to change. The direction of this torque is:: E3 H . BL, b Eprﬂjﬂdﬂ/OF (a) parallel to the angular momentum 7%; C R a, {)5 7LoDuo'i"
..—L I (b) parallel to the angular velocity vector """ —t q A
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is susPended from the ceiling. A rope passes over it with a 20.0 kg block attached to
one end and a 10.0 kg block attached to the other. The rope does not slip on the pulley.
When the speed of the heavier block is 2.0 m/s, what is the total kinetic energy of the
pulley and blocks? (Hint: The radius of the pulley is not speciﬁed because it is not
needed. For the pulley, K = éIwz; both I and w depend on the radius R of the pulley in suchaway that it cancels out.) I 3’ imgz' A”); (b ;§'£ 5° Idlgﬂimgl) L
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Approximately what will be the acceleration of a massive body dropped near the surface . 7 , r_
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Earth) WSINﬁ gwsgamrrw/Im‘ Ext/54577! cwkzr; Lg (Mayan):
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9. At the same instant that a 1.0 kg ball is dropped from 40 m above Earth, a second ball
with a mass of 2.0 kg is thrown straight upward from Earth’s surface with an initial speed of 10 m/s. They move along nearby lines and may pass each other Without colliding. At
the end of 1.0 s, the height above Earth’s surface of the center of mass of the twoball system is about (in your calculations use 9 = 10 111/52): (3352111 7746’ Cam ﬁszmﬂ I5 taxman/£7 KW” :Jég‘lm‘t;
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elastically with a wall and bounces back with the same speed. If the collision with the
wall lasted for 0.04 s, the magnitude of the average force exerted on the ball in this collision is: ...._E'__._> T) :m‘j‘ 65 :—/ (a) m 6‘73; " ‘ 53*:th HAWK) :+/ Fiipzﬂp’tép' : (—0!) :35 :fonf
(d)100N 53" + "’7 "’9’ (e) 12ON A person of mass m == 100 kg is standing on a cart with mass M = 400 kg which
initially moves with speed 10 m/s on a straight track. At some moment, the person
starts running with speed 5.0 m/s with respect to the cart’s ﬂoor towards the back of
the cart (i.e., in the direction opposite to the original motion). What is approximately
the speed of the cart now? (Hint: remember that the person’s speed is measured with
respect to the cart after he starts running.) urn/S «Ann/«5 ém’feﬂm‘rw “5 MdMWT'V’”,
(b) 9.0 m/s Mg: #4:er (Pf. I (C) 70m/S CENWR~0F~WJS "Lamar170’?“ I" 6’Z/Wg7 : (d) :0 111/8 50 E; 1‘ (Mtyl e‘mlva :[t/dolCéb) Z/JM “Viv €153,610 e 0 s ' 3 0 1:. ya () 111/ so raga :Qgpv, #11 ﬁlm” : igloo) vqff‘o
4(09'449V 5‘, v: £70 :75// A block of mass M = 50 kg rests at the end of a rigid uniform bar of length L and mass
M = 50 kg. If the bar is supported at the point L/4 from the block, What force I3 is
needed to hold the bar horizontal if it is applied at the other end of the bar? (Hint: the
mass of the uniform bar should not be ignored. Take g = 10 m/sz.) (a) 0 N [E] if:
(b) 10N 4 (c) 20 N riff/W 1E
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(e) 40N 3 M1
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k m 64 N/m, has amplitude A = 1.0 In. Its maximum speed is about: (a) lZm/S Kw) : A COS 0.2+) mob \JC—f) ~— g; mm $349+)
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This note was uploaded on 12/02/2009 for the course PHY 317k taught by Professor Kopp during the Spring '07 term at University of Texas at Austin.
 Spring '07
 KOPP
 Physics

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