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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: 游客未登录  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#
 
单选题 ( 1.0 分) 切至整卷模式 eid: 4094  对错数 0:0  难度: *****  
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  A new car manufacturer advertises thatbxeq62 /c ) 4gdpdjz;z their car can go "from zero to sixty in 8 s". This is a descriptionxdq;d2jzb)6pzec /g 4 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 East (+x direction) f,2-rn rp rbkory0p t8qk9d ;:begins to slow down as it approabr ,89fprpkr;2yq n: ko-0rdtches a traffic light. Make a statement concerning 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 o ljm)r c9d35(yg0vbwzbject is zero, does it mean that the acceleration is zero? ywjg l9b(r z)mc350dvSupport your 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. Theysc36iova.m/e1am hp1 ) +imu/zw.lrs both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the final speed oeosa6/m vm)ua sii r1 wz13hml+.p./c f 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 thro 61w.b2its aeh ee/zi3d6 hw5xwn straight up. Make a statement about the velocity and the acceleration when thiwi ./ be6eahtwzh126d exs5 3e ball reaches the highest 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 ug3uapj++.nq building. One second later, ball B is dropped from the same building. As time progresses, the difference i3g++qu.npua j n 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 accelerateo,bs8n/b*hp* dq qpn,be+ (i hs at $4.0 \; m/s^2$ 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 of 5.0 m/s experiences a constant acceleration x/z 8w,fb w1izow,z8zwi 1/fb xf $2.0 \; m/s^2$. 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 upwa6kk ppuw x3 m1bg*fq 8bfw271ard with a speed of 15 m/s on the surface of planet X where the acceleration*a8ppbw7m13u1w qgf6fk 2b kx due to gravity 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 up with a speed of 30 m/s. (only fill in numerical vakb * frwer)5e0lbr5e f*ek)wr 0ue in 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 vel1 m(5rf:tn heq)y7lnpocity 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 j(jm)yjrqu :0 the acceleration 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 qkgcu 6c+ee79, the resultant force 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 external fz6lc*lqugo8hop: 32(ua :8c gm qg8ryorce, 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 starshipuemab +:s1 rho525sen NO-PAIN-NO-GAIN are suddenly turned off, while traveling in empty space, the smab n2+ossr:55 1 eheutarship 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 a6n 7ny +katk3 1zgt -*z lq6,hilp8npznd produces an acceleration a. What acceleration results if a net force 2F acts,8zg z17ait6y 3 kqktpl* -nnpzhl+n6 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 collides with3oc9f;bf6zmd9t (e poyzs8-5 4ohn-k )s rfdd a 1500-lb car and causes a lot of damage to the car. Sincz -ton ok)msohc9y4 p98f 6efr f35 z;-(bdddse a lot of damage 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+hcr 0u- ag4go,tww /kew dq+2he Earth pulls on this object with force mg, wk r/c o2,wwhdg-+q4a +u0wtge hich 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 ati.97zub)asm8abmw rel 8(h s.r.dl1 m their respective terminal velocities. Whira.z w hsd.mm8bm i7b1s) r8.l(e9aulch object 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 hanging by a sf;07 qhzb dj*zasp5 ;ot-m8iwtring from the ceiling of an elevator. The elevator is moving upward, but slowing down.a -o zd5pf7;jhqmi;wbs8z 0 t* 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 an inclined ramp at constant velocnpmnk hteu+k75 j9.s5f.+wd atq ::u mity. Thus we can deduc t:k 9anu t..s5+efnd 7+ukj pqmw5h:me 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 stands on a scale in an elevator. W drm.v6paq, .fhat will the scale be reading when the elevator is accelerating down m..fpdrav6q ,ward 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. 4-1, if M = 0.60 kg and m = 0.40 kg, what in5 1dt*4qj/qqfe iue0s the magnitude of the acceleration of1nd uqqi5et4je*f /q 0 the system? (Ignore 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 horizontal floor with a force ofqmh,ng r n,()z 100 N in a directzn ( ),qnrmgh,ion 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 supmld4qk :0-r.ytn wo3c ported by two ropes as shown in Fig. 4-2. What are the tensioko3y0l w.mcr:q d4-nt ns 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 in contact with each other on a fricp0:nkc, lic.t s*1jwmtionless surface. (See Fig. 4-3.) What is the acceleration of the more mas,:kj1c*wm cilpst.0n sive 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 accele ijgs5 xkgregscw*ad 9c882 dn5.4pdj ca4.(krates a 4.0-kg mass, from 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. The plaxs2rx-yj8aa6t q2 . cine is inclined at an angle oasxx rjt 8.ya-ci622qf $30^{\circ}$ 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 against a stationary brick wall, the amount of work y q c0m7pp d*77j zxkpo8/fm;cho j o7p7zxd*07ph8mqk /m cpc;fu 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 carrying izy;s0qtz98 e tp qv37a 10-N object, the amou7ty 9p;iqz0tz3 sq8vent 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. t2k4 n igcap90hw);vr Compare the sign of the work done by gravity while the ball goes up with the sign of the work done by gravt agc)ir92;p4wkhn0 vity 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 isg,0,dl;mrlj 4l: ux0l pxf j*w moving at twice the speed of the car. Which statement is true about the truck's kinetic energy compared to that of th:ll,x * x,p4j0l;wgldrfmj u0e 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-k werr.7)3zs fmg mass is moving with speed 4.0 m/s. Both objects encounter the same constant braking fo r7me.szf3)wrrce, and are brought to rest. Which object travels the greater distance before 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 neovpvt.vn * o:za yzj,a) f+j+8gative potential energy?

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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 eso/+w;ea6 ra ve-1h:tild r5h nergy K, to its potential energae 1;twhvlds/+5e: i-hr ra6oy U.

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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 p4se5n p g,nr;k3.gf wtimes the work in one-third the time. To do so, your power output must have beef;,rk4e.wpgpg s3 n5 nn

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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 rf yt-k5c ,f(gmp2y(*vy:r lgat 25 m/s, what distance is required to stop a car moving at 50 m/s under thev(fkry5 y*g,2l : trc (gmf-yp 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 hilhit 6fgo,p,r:3 9suvil with an initial speed of 4.0 m/s. Neglecting friction, how fast will she be moving after drpr ,it3:96ihoguvfs ,opping 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 f q3c7limq,e(b+btspg 96ui m)rom ground level with a kinetic energy of 40 J. At the exact top of its trajectory, its total mechanic6imit,s b+7bg q9lump e()c3qal 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 at a point 45 m above the bottom o ckvfya 7:rl93f a dip (See Fig. 6-2). Neglect f3aklv7y frc9:riction, what will be the speed of the roller coaster at the top of the next slope, which is 30 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 with a spe:rp .d/hk 8sgjed of 25 m/s (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the next slope, which i8kh d:p j./rgss 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 object with a constant velocity of 5.0 m/s. vn,t b,h) pg53zxqtki:-qu -:q-wwni What power must be delivered)n guxk -pwqb-vz - :5tnqithw,q,3i: to the object by the force?

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