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习题练习:Grade 9 Test on Mechanics 20241217



 作者: evachen发布日期: 2023-12-22 12:56   总分: 44分  得分: _____________

答题人: 匿名未登录  开始时间: 23年12月17日 19:00 截止时间: 当天 20:00  切换到: 整卷模式

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1#
 
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  A new car manufacturer advertises that their car can go "from zero to sixty in 8b;khbm (tl3y 6 s". Thb mt6h (ylkb;3is is a description of

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2#
 
单选题 ( 1.0 分) 切至整卷模式 eid: 4095  对错数 0:0  难度: *****  
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  Suppose that a car traveling to the Easd8yc7 w*o-xj nrnk8zr h.j njkwp;900t (+x direction) begins to slow down as it approaches a traffic light. Make a statement cp*rwd0 80n - 9kjrhwz8jk;njyc. x 7nooncerning its acceleration.

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3#
 
单选题 ( 1.0 分) 切至整卷模式 eid: 4096  对错数 0:0  难度: *****  
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  If the velocity of an object is zero, does it mean that the acceleratioh,)l ax .6cj(xe9lgp.0jl- ms wiyt; gn is zero? Support yojlj6my9 tx;e,wgi-h. (sc0. g )apxl lur answer with an example.

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4#
 
单选题 ( 1.0 分) 切至整卷模式 eid: 4097  对错数 0:0  难度: *****  
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  Objects A and B both start at rest. They both anvp)cm wc-l-3-e;uy eccelerate at the same rate. However, object A accelerates for twice the time as objecyn -)p-3wml-c;e cu evt B. What is the final speed of object A compared to that of object B?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 eid: 4098  对错数 0:0  难度: *****  
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  Suppose a ball is thrown straight up. Make a statement about the vel93tva9. ejbxqocity and the acceleration when the ball reaches the high bt9ev jqx3.a9est point.

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6#
 
单选题 ( 1.0 分) 切至整卷模式 eid: 4099  对错数 0:0  难度: *****  
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  Ball A is dropped from the top of a building. One sep) qg(erof j*2cond later, ball B is dropped from the sa2p*) qogef(r jme building. As time progresses, the difference in their speeds

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7#
 
单选题 ( 1.0 分) 切至整卷模式 eid: 4100  对错数 0:0  难度: *****  
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  A cart starts from rest and accelerates a kmda 9u8:wqttu2+nza2 db1 ;jt $4.0 \; m/s^2$ for 5.0 s, then maintain that velocity for 10 s, and then decelerates at the rate of $2.0 \; m/s^2$ for 4.0 s. What is the final speed of the car?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 eid: 4101  对错数 0:0  难度: *****  
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  A cart with an initial velocity ofei,7-or -vj ,vddb iro.:* lij 5.0 m/s experiences a constant acceleration ofe*,, dj. -ir obvlo:r jidv-i7 $2.0 \; m/s^2$. What is the cart's displacement during the first 6.0 s of its motion?

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9#
 
单选题 ( 1.0 分) 切至整卷模式 eid: 4102  对错数 0:0  难度: *****  
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  An object is thrown upwe+ ffquzu7r9n7.cz0pfae 5,r ard with a speed of 15 m/s on the surface of planet X where the acceleration due to graf9zu+rq cf0n7pr. f z75 uea,evity is $2.5 \; m/s^2$. How long does it take for the object to return to where it is thrown?

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10#
 
填空题 ( 3.0 分) 切至整卷模式 eid: 4103  对错数 0:0  难度: *****  
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  A ball is thrown straight c6re;rvsr5i7 up with a speed of 30 m/s. (only fill in numerical value i;rv5s 6er c7irn the blanks)
(a.) How long does it take the ball to reach the maximum height?    $s$
(b.) What is the maximum height reached by the ball?    $m$
(c.) What is its speed after 4.2 s?    $m/s$

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11#
 
单选题 ( 1.0 分) 切至整卷模式 eid: 4104  对错数 0:0  难度: *****  
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  In Fig. 2-1, what is the veloci 8 kcvwoa+ 9 gxjs(up:u(yn*o1ty at t = 5.5 s?


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12#
 
单选题 ( 1.0 分) 切至整卷模式 eid: 4105  对错数 0:0  难度: *****  
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  In Fig. 2-2, what is the acce 58 1k:fskxf 08( ez1r6ilo t+yccl *sdjksz4zleration at 1.0 s?


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13#
 
单选题 ( 1.0 分) 切至整卷模式 eid: 4106  对错数 0:0  难度: *****  
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  When you sit on a chair, the resultant for kuow0/*g moh1ce on you is

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14#
 
单选题 ( 1.0 分) 切至整卷模式 eid: 4107  对错数 0:0  难度: *****  
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  In the absence of an 5fko rxwbf:qoo 8.0q8 external force, a moving object will

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15#
 
单选题 ( 1.0 分) 切至整卷模式 eid: 4108  对错数 0:0  难度: *****  
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  When the rocket engines on the starship NO-PAIN-NO-GAIN are suddenly turned o; gz( :qahcbo7ff, while (;qhzbcag 7o:traveling in empty space, the starship will

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16#
 
单选题 ( 1.0 分) 切至整卷模式 eid: 4109  对错数 0:0  难度: *****  
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  A net force F acts on a mass m and produces an accelerap 9v/ryf/2inpk2s-s etion a. What acceleration results if 2p fe-//s 29pknisy rva net force 2F acts on mass 4m?

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17#
 
单选题 ( 1.0 分) 切至整卷模式 eid: 4110  对错数 0:0  难度: *****  
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  A 20-ton truck colli/qwy od83m9un des with a 1500-lb car and causes a lot of damage to the car. Since a lot of damu9dmqoy8 /w3 nage is done on the car

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18#
 
单选题 ( 1.0 分) 切至整卷模式 eid: 4111  对错数 0:0  难度: *****  
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  An object of mass m sits on a flat table. T; myh8 ay44bbohe Earth pulls on this object with force mg, w a8h ymoy;4bb4hich we will call the action force. What is the reaction force?

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19#
 
单选题 ( 1.0 分) 切至整卷模式 eid: 4112  对错数 0:0  难度: *****  
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  A brick and a feather fall to the earth at their respective termina - p lymic0m6zj8nhi99l velocities. Which objeczp 9 8mnhci6y lm9-ji0t experiences the greater force of air friction?

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20#
 
单选题 ( 1.0 分) 切至整卷模式 eid: 4113  对错数 0:0  难度: *****  
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  An object of mass m is han( zbj) ke33oosging by a string from the ceiling of an elevator. The elevator is moving u3b3ejo z kso()pward, but slowing down. What is the tension in the string?

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21#
 
单选题 ( 1.0 分) 切至整卷模式 eid: 4114  对错数 0:0  难度: *****  
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  A packing crate slides down g3zp1ln * y7zu*vduh ,5bc )fman inclined ramp at constant velocity. Thus we can deducen*z37cd,5y u vp1 gh*fubz m)l that

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22#
 
单选题 ( 1.0 分) 切至整卷模式 eid: 4115  对错数 0:0  难度: *****  
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  A person of weight 480 N s1rxq;0w il is2nvx5:ctands on a scale in an elevator. What will the scale be reading whenx2l1q0wi xcr s;:vin 5 the elevator is accelerating downward at $4.00 \; m/s^2$?

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23#
 
单选题 ( 1.0 分) 切至整卷模式 eid: 4116  对错数 0:0  难度: *****  
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  In the Atwood machine shown in Fig. 4su 0:e oefch1n9(+,h5wghya i -1, if M = 0.60 kg and m = 0.40 kg, what is the magnitude of the acceleration of the system? (eew9gi o+ sf5:c 0h(nh,1hayuIgnore friction and the mass of the pulley.)


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24#
 
单选题 ( 1.0 分) 切至整卷模式 eid: 4117  对错数 0:0  难度: *****  
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  A student pulls a box of books on a smooth horizon*h4 9qxlb +wme rv(vvlus3rz51n dj93tal floor with a force of 100 N in a directu4jl3 9e+n5sqhd3rv*vb( x 9v zwl1 rmion of $37^{\circ}$ above the horizontal. If the mass of the box and the books is 40.0 kg, what is the acceleration of the box?

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25#
 
单选题 ( 1.0 分) 切至整卷模式 eid: 4118  对错数 0:0  难度: *****  
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  A traffic light of weight 100 N is supported by two ropes as sho.5f8o7i n9xielfas l0sk7jf h / :a(down in Fig. 4-2. What are the tensione8: a9s (nf5o7sfkx.hl0 7ol/diajfi s in the ropes?


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26#
 
单选题 ( 1.0 分) 切至整卷模式 eid: 4119  对错数 0:0  难度: *****  
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  Two boxes of masses m and 2m are iney;:uveq1m0r1gt ql: y kx,(i contact with each other on a frictionless surface. (See Fig. 4-3.) What is the acceleration of the m ( ;x :qeyqevty01r,1:luigkmore massive box?


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27#
 
单选题 ( 1.0 分) 切至整卷模式 eid: 4120  对错数 0:0  难度: *****  
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  A horizontal force of 5.0 N accelerates a 4.0-kg mass, frowmth( sv j a71x;j(; kg6e8pgbm rest, at a rate of $0.50 \; m/s^2$ in the positive direction. What friction force acts on the mass?

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28#
 
单选题 ( 1.0 分) 切至整卷模式 eid: 4121  对错数 0:0  难度: *****  
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  An object is on a frictionless inclined plane. Th2bik9e wx6 r7fe plane is inclined at an angle of e2ri9 6k wf7xb$30^{\circ}$ with the horizontal. What is the object's acceleration?

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29#
 
单选题 ( 1.0 分) 切至整卷模式 eid: 4123  对错数 0:0  难度: *****  
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  If you push twice as hard agaig gd/t4 yy 0mt:4:uiq8 wn;jtsnst a stationary brick wall, the amount of work yo t4:mt08g4 dy ni;wg :uy/qtjsu do

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30#
 
单选题 ( 1.0 分) 切至整卷模式 eid: 4124  对错数 0:0  难度: *****  
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  If you walk 5.0 m horizontally forward at a constant velocity du28)rsdv l 6qld66e44boy5vx p4f(y- qjwwlcarrying a 10-N object, the amouno4p)2uvw66dfqd rx44 v( 5eb-6d8ylq sjllw yt of work you do is

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31#
 
单选题 ( 1.0 分) 切至整卷模式 eid: 4125  对错数 0:0  难度: *****  
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  You throw a ball straight up. C v-heu;q/) ii18ljsh yzoo ;e5ompare the sign of the work done by gravity while the ball goes up with the sign of the il zo;ohsyu5eeq81;-h/ ) v jiwork done by gravity while it goes down.

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32#
 
单选题 ( 1.0 分) 切至整卷模式 eid: 4126  对错数 0:0  难度: *****  
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  A truck weighs twice as much as a car, and is mok2zhvcn506 zyving at twice the speed of the car. Which statement is true about the truck's kinetic energy compaz5kh0c2vyz 6n red to that of the car?

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33#
 
单选题 ( 1.0 分) 切至整卷模式 eid: 4127  对错数 0:0  难度: *****  
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  A 4.0-kg mass is moving with speed 2.0 m/s. A 1.0-kg mass zlu )fs4(rn,3 jfkd.v is moving with speed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Which object travels the greater distance beforezr3 kv4( . fu)j,ldsfn stopping?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 eid: 4128  对错数 0:0  难度: *****  
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  Is it possible for a system to have negative potential enk9rc -xz9; ez2njh t7 q8wz(ooergy?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 eid: 4129  对错数 0:0  难度: *****  
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  An acorn falls from a tree. Compare its kinetic enerks )wr/v))(yom nuqd+gy K, to its potential energy U) w kr(+msqun)vo/dy).

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36#
 
单选题 ( 1.0 分) 切至整卷模式 eid: 4130  对错数 0:0  难度: *****  
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  Compared to yesterday, you did 3 times the work in one-third the3pt8s: wbv x(o time. To do so, your power output must have b vts3 :(pwb8oxeen

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37#
 
单选题 ( 1.0 分) 切至整卷模式 eid: 4131  对错数 0:0  难度: *****  
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  If it takes 50 m to stop a car initially moving at 25 my p0+uly* yrg d/.;8udwsq kt1/s, what distance is required to stop a car moving at 50 m/s under the y u.8lkypq0+u*d/1gw styr d; same condition?

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38#
 
单选题 ( 1.0 分) 切至整卷模式 eid: 4132  对错数 0:0  难度: *****  
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  A skier, of mass 40 kg, pushes off the top of a hill s9j )) xqxi9 r39ztkewwith an initial speed of 4.0 m/s. Neglecting friction, how fast will srq9ei z 3kwx9sxt 9j))he be moving after dropping 10 m in elevation?

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39#
 
单选题 ( 1.0 分) 切至整卷模式 eid: 4133  对错数 0:0  难度: *****  
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  A toy rocket, weighing 10 N, blasts straight up from groun(uejud/n y8l+ x z-lv *9o xy;qe+ho(dd level with a kinetic energy of 40 J. At the exact top of i (jyhv8y+ (xdduz /+* e-ox; e9olulnqts trajectory, its total mechanical energy is 140 J. To what vertical height does it rise?

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40#
 
单选题 ( 1.0 分) 切至整卷模式 eid: 4134  对错数 0:0  难度: *****  
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  A roller coaster starts from rest op8wo lw3fa5c-u 9l4rat a point 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the next slope, which is wrw9o85flc- au3p ol430 m above the bottom of the dip?


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41#
 
单选题 ( 1.0 分) 切至整卷模式 eid: 4135  对错数 0:0  难度: *****  
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  A roller coaster starts at a point 30 m above the bottom of a dip withzbm 6p-pp9pitpzc1y 5k a z+9. a speed of 25 m/s (See Fig. 6-2). Neglect friction, what will be the speed of t apzti 5pcb. p 9p6+pzk1my9-zhe roller coaster at the top of the next slope, which is 45 m above the bottom of the dip?


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42#
 
单选题 ( 1.0 分) 切至整卷模式 eid: 4136  对错数 0:0  难度: *****  
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  A 10-N force is needed to move an objecg/ ,f ete,s-i:t-in tnt with a constant velocity of 5.0 m/s. What power must be delivered to the object itnt tei :,e/-,fgns-by the force?

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