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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 t1 di45/b qal vemit/7that their car can go "from zero to sixty in 8 s". This is a description dvt/4ibiq1a7te m/ 5lof

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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 bp2s/xl1ycw1(+x direction) begins to slow down as it approaches cybs 1p/lwx12 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 object is zero, does it mean that the 1 iu,vczh,i:i0fxl-v6 ekj7 facceleration is zero? Support your answer with an ex z0,v-ex ujkh icf71viil:f,6ample.

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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.o( z)2g wzqmptax8, t accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the final speed of object A compared to that of omax)z,zp t(2 wq8.gto bject 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 thdbvfe4mv q.zejmx03x+ b, c)+ymm:p 7rown straight up. Make a statement about the velocity and the acceleration when the ball reaches the hig 4me+7vx,v)xz:+ .pqjyf 3b mcbd em0mhest 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 build9epj3 xhg4(m q0wv *tgei1na. ing. One second later, ball B is dropped from the same building. As time progresses, the difference in their spe4 qgt0jaghm9( 1e.* n3weixp veds

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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 accelera+sfy.. av oi.lc n ey8-2cimj6tes 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 expjt fi+totiu 2 r2h9b77eriences a constant acceleration of9t 7btu ofj+hi722irt $2.0 \; m/s^2$. 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 upward with a speed of 15 m/s on the surface of plao enom*c)a4sg4;gb/ onet X where the accelerat bm4 gseo*) ;/ocgn4oaion 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 speedmk30v3 0qkh:o t ksc8(h ddua) of 30 m/s. (only fill in numerical value(vhkt03u h cmdqk)ks803 o:da 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 velocity a5 kd(/urq z:z,xm.dkh t 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 t yq.q+p2q*pj- gq1 sp 7qqq-xhhe 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, the resulpnw+ /y6lrm:5 2vkvf /acni .itant 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 e-an4rie hn(m )xternal 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-Ppmx+ib*38 . rk y430ulw-yt tzx8zld tAIN-NO-GAIN are suddenly turned off, while traveling in empty space, the starwx.l*i8z4t t3x+y yzk-lupd3rm8t b0ship 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 acceleration iao(3v -f8ki :o zny0x la5rk.a. What acceleration results if a net force 2F acts on mass 4m3 rok:-va xi50 zi(yn kol.af8?

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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 with a 1500-lb car and caust21,j mteg m9,qvcjao e( grd(;5sg.ces a lot of damage to the car. Sincr.q;m c,,vd9coj( aes t2(jm gt 5e1gge 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. The Earth pulls on this *cazo: eq5h;,wz/gjedj* fi5object with force mg, which w5; :j e a,zfq/oec* zj*iwd5hge 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 respectlarr , it 3loier5y479ive terminal velocities. Which object experiences the greater force of air fa4ryt r 5 7liorli9,e3riction?

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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 string from the ceiling of an elevator. T3(j ei2epv iz*6*cadmup*3s qhe elevator is moving2dc a(us3*m**izij3qee6 vpp upward, 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 an inclined ramp at constant velocity. Thus welq4rrd0k 0p*(s+rsjrb 4 tlj* d3l:uf can deduce tj*r:0lk *b r4plrdlfq4 j(3dr0tus+s hat

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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 standsm80b8 h d*4 t.tmzn cknwk,f6m on a scale in an elevator. What will the scale be reading when the elevator ishw.z6,kk mtmdfbmc8 0 *n8 4tn 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. 4-x+f6e0-f iua.ojtoog* m(h ;y1, if M = 0.60 kg and m = 0.40 kg, what is the magnitude of ta y0 (jmogi+f *xft-h 6e.o;ouhe acceleration of 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 of 1( p,ccb;ev*zj70j m af00 N in a direction 0* bzpcc(7fa jm,jv;eof $37^{\circ}$ 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 weigh, qt ;r j,vk rtv9gn+yb6.ryu4t 100 N is supported by two ropes as shown in Fig. 4-2. What are the te yr.b6t9r,,rjvqy+4g k t; nuvnsions 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 witheqiffpl +j6ma43i2 z 6 each other on a frictionless surface. (See Fig. 4-3.) What is the acceleration ofpa3 mz jei2 f46fi6+ql the more 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 4zmsp ) 92ycbljt y/vcs4.ss4(.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 fri hqh( 96s 04r1++xuu6ch fuusgx4 emfyctionless inclined plane. The plane is inclined at an angl+4x9usfe01 c4( yr+mx uu g hf6hhqsu6e of $30^{\circ}$ 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 a ;x*oimivvn 4p,/:gibrick wall, the amount of work you d:i v px;*gavii4/,m noo

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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 forwar/qy d-k5s g;sed at a constant velocity carrying a 10-N object, the amount ofq; yes/kd-5sg 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. Compare2+ knfioegg-d 5.aucq2;emk n 5lw76a the sign of the work done by gravity while the ball goes up with t5 n7ka6qg eiland;wu2g 2 .oe -cf+5mkhe sign of the work 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 moving at twice the slli jw/6x,8zhx: abue9*f 9pwpeed of the car. Which statement is true about the truck' w e*w:ip9l ubax/6h,z8lf9jxs kinetic energy compared 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 sye4ws7:dk ozov d* :tr0hrc .,f mo);m/s. A 1.0-kg mass 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 d rr4d m7;zyo :hdt ,sew.oskc*0ov)f:istance 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 ne bn p)5h. /cgsqyq-u ky*+mu4jgative 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 energy K ubi 3set6r64s, to its potential energs t4e6ub3ri6s y 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 times the work in one-third the time. To d0frk)+ ie *ifyo so, you freik+)i*0yfr power output must have been

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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 iv+wwxzez / upsgn:+va n b/fhb3*2(( a car initially moving at 25 m/s, what distance is required to stop a car moving at :v /zbp(+2+a3g x(uhb/nvew ifsnw*z50 m/s under the 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 with an initial speed of 7g nr-a3xrfa cjn 5- cfrj;)h74.0 m/s. Neglecting friction, how fast will she be moving after dropping 10 m in elevati5a;)n7crjr73gxjnf - -racf hon?

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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 gro, r yuv/n/qzz*und level with a kinetic energy of 40 J. At the exact top of its traject/ zr,nv/y* qzuory, 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 at a point 45 .79m;y wo1 mupk 8wfamw6bm (tm 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 (m8y 7mukwfm.6 m91wp bt;w oais 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 abo0zq- b4fa: tdcve the bottom of a dip with a speed of 25 m/s (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at thet0d f-z b4qac: 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 object with a constane fqbcj fu*.ib6o;kt/ 3fk meb:02et(t velocity of 5.0 m/s. What power must be delivered to the object by the forkeu2c;e b*.6fo 3tmt e/ibfb(kj:0 f qce?

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