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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 sibwl074 .vyd 8ikwh k)mxty in 8 s". This is a desc 0 )7kyv hd.ikbw8m4lwription 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 Eastd75;qf/ y bvif+o hhh2 (+x direction) begins to slow down as it approaches a traffic light. Make a sqi+f/hfyvbo d25 ;7hhtatement 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 accel4a8ldyje6hh957v o vleration is zero? Support your an aldlhve94jv h6 y58o7swer with an example.

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4#
 
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  Objects A and B both start at rest. They both accelerate at n8+fc -odv l,mthe 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 o,fn+ mod lv8c-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 thrown straight up. Ml,o( /tszg1xvbh6k80/dfx ioake a statement about the velocity and the accelerakbxstv 8/d01gx 6hf zl,io( /otion when the 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 thehoctbww8 u o w*x66e)t2t xvfzd36u01 rr5 :wf top of a building. One second later, ball B is dropped from the same building. As time progresses, the difference rc6w6 uho0w 3tb *z1tdfv6fwot8 re wu:x2x 5)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 anknc6 t6zzeo.q 2xe2+ id accelerates 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 experien )ohwa- y9rrl9ces a constant acceleration ol-hoa rr)9 yw9f $2.0 \; m/s^2$. 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 -06gv3d otc1 dl,zjhgof 15 m/s on the surface of planet X whereg3lo6, h-vg1dcdj t0 z the acceleration 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 numeri-l7e 20wi-8 kmm;9iazxnhd/vr1 ngpw cal value in the blanks) n;h 9 gxdw-27mi/0mw prive k-18lanz
(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 then -rmx. 83cjyah1woyeh 9- /qy velocity 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 acceleratiz kvg44 r(t-b/xmi(vgon 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 resultan,jwo9g gftw-) wm8eg1t 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 force, a moving ob2ve-6eyse g;eject 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 ond+ f yn5+d faczpt/k+6 the starship NO-PAIN-NO-GAIN are suddenly turned off, while traveling in empty space, the starshipp6 /ff+ydk +ncdz5+ta 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 prybp74r, r;; hy+ribjfoduces an acceleration a. What acceleration results if a net force 2F acbf+;h y rj7i rry,p4b;ts 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 with a 1500-lb car and causes a lot of damage to the ca+5d,rue7w.yt(vz jtird dtim-+f42 nr. Sinv ydn7m5ft 42tw(ie -dti uj .+zrd+,rce 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 object wi )k(u;b ultml0th forb(lu kt0u ml);ce mg, which 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 th3lgn+lg nsp q/4 *8bhee earth at their respective terminal velocities. Which object experiences nbl g*gnq8l 4s3+phe/ 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 sta;m9nqw73h ir :*ejre ring from the ceiling of an elevator. The elevator is moving upward, but slowing down. Wha;:aw eiqm9jr*n73 reh t 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 slidesgu5gpdl.6+ )7fn+ rjx 9xloq. ess dd+ down an inclined ramp at constant velocity. Thus we can deduce5 d+lgfd+s u)q sn6r7xp..x jgedo9 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 st0 2vogt 3o4kwrkg9h;kands on a scale in an elevator. What will the scale be reading when the elevator is ag;2wk o04gk3 9r vthkoccelerating 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 in2mqu+,by5w t ,r3k3 1gbs9fhyn5s jiu Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, what is the magnitude of the acceleration of the system? (Ignor 91 t,bsjmuhky2u wsbf3 +55iqn,gry 3e 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 ox;+27gvu( zom7fy; m69sw b hxvhqjs4f books on a smooth horizontal floor with a force of 100 N in h(;y7xm6;jhvsw7zx+ mbuq g2o sf4 9 va direction 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 1i*y7ab1 p4n.xw)nhdll,s b 5g00 N is supported by two ropes as shown in Fig. 4-2. What are the tensions in the rope51 s4n.xw,bn7 bid l)*yhgalps?


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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 q 4z1+uqtik:.nd m2 xxon a frictionless surface. (See Fig. 4-3.) What is the acc nkqtmd:4xz+ 12iq.ux eleration of 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 4.0-kg mass, from rest, at w-+5 g3wzqowd(6efj ka 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 planewipqkh8 gb)qmp11g + / is inclined at an angle qk8w+m b1hgi gpqp/) 1of $30^{\circ}$ 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;jfm9ta o.1mb a stationary brick wall, the amount of work you dmt9jabm1;of . o

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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 constaer+43/ cppjpqv4 (n jmvi3eo,nt velocity carrying a 10-N object, the amount of work yoopv ,ppri (3m ejqev+jn3c/44u 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. Compare the sign ok / 9kpmo5sn4sf the work done by gravity while the ball goes up with the sign of the 45/no kssk9mp 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 speed of th4mxa xnghx )f dh11i7,e car. Whi1 fi71xa,dxgh mx4 )nhch statement is true about the truck's 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 m/s. A 1.0-kg mass is movil 77ec )vwx,92 fsylojem2ba1 ng with speed 4.0 m/s. Both objects enclbl1 yvjs279fwo7a2ee, )xcmounter the same constant braking force, 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 negative potent ,z-zlp,j pud:5s kio5ial 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 x 7m(f6dmqt,p K, to its potential energy U,m md t(xfp7q6.

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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 do so,v 97y;ww dvxs(dp9.qh +k k)it your power outp+yt i(kw 7vdw99;v ) xkq.sdhput 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 a car initially mof-btb;h 4h g8w7/he;cex t(ze ving at 25 m/s, what distance is required to stop a car moving at 50 m/s under h ehfx(-t;w4 t7bz/ ;begech8 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 w/te4zn a2dth/ k* y;0si 4fvdkith an initial speed of 4.0 m/s. Neglecting friction, how fast will she be moving after dropping 10 m i t4/4y/hsdk0 f*2a viz ntde;kn 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 st3w ij k ckkg/o*ul312xraight up from ground level with a kinetic energy of 40 J. At the exact top of 33lx1 i jucg/kk2*kowits 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 at a point 45 m abovh -)+ 5l0 ko/etzhy;:gdwhhide 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 30 m above the bottom of the dip? +e5 d/h dkto-y) 0hhwgl;zi:h


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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 po so;::fshy1 azint 30 m above 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 the top of the next slope, which is 45 m abosa1 y:h;:szo fve 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 obje +d3)nfn/ fxyfct with a constant velocity of 5.0 m/s. What power must b/3 +d f)fynnfxe delivered to the object by the force?

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