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Unformatted text preview: 4% WM” 1. A solid sphere and a hollow sphere are released from rest at the same height and at the same time on an inclined plane. They roll without slipping to the bottom and arrive
at exactly the same time. We can conclude that a) they have the same mass
b they have the same radius
hey have the same mass AND radius
they have the same moment of inertia
ﬁ’this is impossible 2. A ﬂatbed truck is carrying a 90.0kg crate along a level road. The coefﬁcient of static
<9 friction between the crate and the bed is 0.250. What is the maximum acceleration that
the truck can have if the crate is to stay in place? 2.45 W52 b) 5.00 mlsz c) 19.5 mis2 . d) 49.1 W32 e) 122 rats2
('9 '3. Pulling out of a dive, the pilot of an airplane gu'  the bottom of the dive, the sped of the airplane i
  ‘ ' l' he ilot'saaren ' lane into a vertical circle. At
What is the ._ut...... r=_  ius @ ies @228 m b) 735 m c) 1490 m d) 1740 m e) 2240 m   ' t is not to excee on that surface. If the light is reﬂected rather than absorbed, the force will be a) greater Pless c) equal either way
0 d) insufﬁcient information to kn e) none of these 5. A pulley hgsraaéeiﬁalgngular speed [email protected] and a constant an ,
acceleration 3.41 rad! . Through what angle does the pulley tur n 5.26 s ’ "‘7 M £61 4. Light carries momentum, so when a beam impinges on a surface, it will exert a force a) 19.3 rad b) 42.6 rad c) 82.7 rad @113 rad e) 160 rad 6. The kinetic energy of a particle of mass m, as shown in the picture below right, is 5.0
 J at point A. lts kinetic energy at points B, C, D, E, and its turning points are  a) None of these
b) 2.0 J, 6.0 J, 5.0 J, 10.0 J, A and E
c) 8.0 J, 4.0 J, 5.0 J, 0 J, not shown
13.0 J, 9.0 J, 10.0 J, 5.0 J, A and E
e) 13.0 J, 9.0 J, 10.0 J, 5.0 J, not shown 1.0111 2.0111 3.0m 4.0m 5.0m WSmemm.n 7. An object of mass 2 kg )is held at thetop of a triangular wedge as shown in the
ﬁgure, and then rele . The r lice Ie for potential energy is at the base of the
riangle. Neglect friction and u g = 10 W82. What is the amount of work done by the gravitational force as the object es to t ottom of the wedge? a)60J b)10.l ch d)40J @SOJ @ 8. A ball is tied to a string and twirled in a horizontal circle above the person’s head. If
the string were to break, the ball would a) Drop straight to the ground.
b) Continue moving in a circular path until air resistance causes it to stop. Spiral inward toward the center of the circle.
Fly off in a straight line tangent to the circle and then move in a parabolic trajectory. 9. A 220—kg object is lifted at a constant speed through a height of 42 m by a crane. If
Q9 the crane takes a total time of 1.8 seconds to lift this object, what is the average power
required? Use 9 = 10 W52. 1 kW b) 25 kW I c) 75 kW d) 100 kW e) 150 kW 10. The ratio of the Wm the initial kineti y of an object is one half. If the initial velocity of the object is 10 mls. what is the ﬁnal velocity? a) 8.0 mis b) 7.1 mls mls d) 50.0 mis e) 0.14 W5 1 1. Swimmers at a water park have a choice of two frictionless water slides (see
Figure). Although both slides drop over the same height, h, slide 1 is straight while slide
2 is curved, dropping quickly at ﬁrst and then leveling out. How does the speed v1 of a
swimmer reaching the end of slide 1 compare with V2, the speed of a svvimmer reaching
the end of slide 2? .\
I 3) V1 3‘ V2 V1 < V2 {Q/WH = V2
d) No simple relationship exists between v1 and v2.
A 31.11%; '1
MM, .4—« {If
5/9’77 'H l
in l
L 12. A SOD—kg cannon ﬁres a 4.0kg projectile with a velocity of 500 mfs relative to the
ground. What is the recoil speed of the cannon? '7'“
a) 1.0 mls b) 2.0 mls ® 4.0 mls d) 6.0 mls e) 8.0 mls 13. A SODkg cannon ﬁres a 4.0—kg projectile with a velocity of 500 mls relative to the
ground. What is the recoil speed of the cannon? [A] 1.0 mils [B] 2.0 rats ['0 4.0 mrs [D] 6.0 ms [E] 3.0 mls 14. A car with tires whose radius is 35 cm is traveling along a highway at 29.8 mls.
What is the angular speed of the tires? ' [A] 90 radi's 85 radis {C} 80 radfs [D] 75 radfs [E] 70 radls the crane takes a total time of 1.8 seconds to lift this object, what is the average power 15. A 220kg object is lifted at a constant speed through a height of 42 m by a crane. If
0 required? Use 9 = 10 misz. [A 1 kW [B] 25 kW [C] 75 kW [D] 100 kW [E] 150 kW fag __I\
An object of mass m = 20 k ' on a rough inclined plane wit height . length 8/;
m. and which makes a i" ith the horizontal.  s .ject is ed t we“
and it stops on a rough ho ' u . surface, at a distance . rom the bottom of the inclined(plane_, a : a e ﬁgure. The coefﬁcient of kine Ic friction on t e inclined
plane eggs/an . lKE * w ;\gg +M‘?
4
J. :1 it
QINW 4 ginNV
t/ j J
Va xxx Lb% per Mk 0"8
ﬁc—lohls ﬁg“ 30 A. What is the kinetic energy of the object at the botto of the inclin Ki 5ﬁringm F5 “a 2? 1M0» B. What is the speed of the object at the bottom of the inclined plane? .‘I weF‘A; 17. A crate of massgtzykg sits on t  : o of a loading dock. (Use 9 = 10 mfsz)
a. If the ramp is inclin at an angle uw Ind the normal force acting on the crate.
b. If we assume that the surface of the : ‘ a is smooth (no friction), ﬁnd the force that a
worker would need to apply parallel to the surface of the ramp (x'—axis) in order to push
the crate up the ramp at constant velocity.
c. if the worker applies a force parallel to the 'srﬁgd the magnitude of the force
needed to accelerate the crate up the ramp 1.5 mis .  5% =4
0
c 1,? l: e: E Banks [$17 _ News? v? *' ""‘“ ° ...
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 Fall '08
 Ashkenkai
 Physics

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