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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#
 
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  A new car manufacturer advertises 4*x ocms4)w f;zin4jfiz: ,yqthat their car can go "from zero to sixty in 8 s". This is a description o,y icifmzo nq4);z sxfj*:44wf

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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 (6t/dtd*)uy *diu*cvk, db*pg+x direction) begins to slow down as it approay/*t*u*kd d d , bitcpu)v6*gdches 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 hx7;(ox,pqn;l w 7c twthat the acceleration is zero? Support your answer with an e77;hl(pxq;xoc t,wnw xample.

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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 accelerate at the same rate. Howrx 5k)v5d thrhz)2;qfever, object A accelerates for twice the time as object B. What is t;f )dhk zh)5vrt52qrxhe 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 statev/wys vy4 qjylbx0gs2 +7c00 nment about the velocity and the acceleration when the baljny c b s0/0y x0+y2wsvqv47gll 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 totkxk 3no*c,(m9,ptg o p of a building. One second later, ball B is dropped from the sammtt*g,, p kxcn oko3(9e 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 ans,3 hw1q5uyc(+ zdsp1*/dowuh/r:zmkjb zg -d 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 5b1 b em6qa ugz1g1bfogaa/33velocity of 5.0 m/s experiences a constant acceleration of a6gg1ze15bou3/m13b baqgfa$2.0 \; m/s^2$. 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 o5 znh:nsxyoki9 - ce28f planet X where the acceleration due to gravityoyk 5si c2 9nn:h8zxe- 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 u;oa9a f3 kg l3lz1yv)ip with a speed of 30 m/s. (only fill in numerical value in the blanks) v9aia k);1yl3ofzl g3
(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 at tc.v b/aym m6o4 = 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 acceleration at 1.0 s?4+9 opr rsdag2


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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 force ouo2q 2f jb c0ck09e;(8eoadbv(5s rkcn 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 exterlj15:m ngys2 b m*q2mbnal 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 enginesz(rbj 5rv.:(/x-iu.rx8nsj o fcys s2 on the starship NO-PAIN-NO-GAIN are suddenly turned off, while traveling in empty space, the starship wils. bx.-r/ nxvs5j(jr cfr(:ui8so yz2l

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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 a. What acc jyvp6wb0g:e1eleration results if a nep1 wv6gyje0:b t 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 collidnqqwqgn- 8t+.es with a 1500-lb car and causes a lot of damage to the car. nt-+q. qgq8wn Since 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 E 4*;hkcghg )dcarth pulls on this object with force m) c*cg4hdhg;k g, 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 the earth at their respective tp x*kxm bejn 9l ,s4cqu6t:b/x:x; dk9erminal velocities. Whichjk;x 9bx/ ud:b,s ce4*lm kq:px n69xt 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 stris0+l/7os*k7z 3iq )c bn o7u3djmmee mng from the ceiling of an elevator. The ele3)nj7kb m0d+ /oe7 si os3zel7cmmu*qvator is moving 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 cox6tdv.s lr4 c7nstant velocity. Thus we can d rx.dsl v6ct47educe 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 scalew u/8dyg7r d4dck3 h3-fphx)t in an elevator. What will the scale be reading when the elevator is7 prfd3-h u)ydxh4w3t8/ kgdc 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. 4-1, if M = 0.0aa-jsw. lk:)u+:+ pwlljd .r l thw5t60 kg and m = 0.40 kg, what is the magnitude of the acceleration of the system? (Ignore friction and the maw 0 :t+5wsluh).l:ldpjat -la k+.wjrss 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 horizontz3akj a3gz;3hd/k 0 lyal floor with a force of 100 N in a direction dj0 hz/g3;a y3z3kkla 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 suutnfu7tx:ahmdc5*(4 41* s 8sphu ughpported by two ropes as shown in Fig. 4-2. What are the tensimg 4hpxd *1fhcsn8 u4:*u 7t(th5uasuons 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 othex5p /y5 m9sdujr on a frictionless surface. (See Fig. 4-3.) What is the acceleration of the more massive boxd5jy x/um5p9s ?


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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 me iom.nuvb 5+-ass, 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 frictionlessbtockds5 rlux v-f5272y+1 vl inclined plane. The plane is inclined at an angle of s vk5lvrcl5y7bf x21u+d- t2o$30^{\circ}$ 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 ha*a ,lom ogdzm,;, vv(jf- pg5lrd against a stationary brick wall, the amount of work you ov5,j, m gof-*v,a( p;llmz gddo

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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 d.snc6s ky-* twhe/qb)tex5; a 10-N object, the q ts6/*xcdh5ky)t;ewn -bse. amount 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 straukp1 1onuatij ()sn4hsfa21+ ight up. Compare the sign of the work done by gravity while the ball goes up with the sign of the work done by gravity while it goes do)js1u(1k 4u a1fp i+ans2nh town.

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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, andyzq8 yhxfxadx2)aitv79. yd **. w5oy is moving at twice the speed of the car. Which statement is true about the truc .9*x*8ddy ixhqy)xy5z fa2o7wvt. ayk'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 movin zzk3q(:ql ,v t8zjgz-g with speed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Which objectz8tkz, 3zvl:j-qqzg( 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 jwj.32p5sh/* 9p+cf cgas gzwpotential 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, to its potentia14kiyw .ywa)3vv l7nwvly , q5l energy yyw4)v yqv73nkl 51,. iawv lwU.

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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 31 :k;gnof*ytj times the work in one-third the time. To do so, your power output mug:fo t ky1;jn*st 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 moving at 25 m/s, ;izly,8 03w*xy ,g 8mpd fchqxwhat distance is required to stop a car moving at 50 m/s under the same condition?zpcf l,8* g 3hmdqw0,;8yiyxx

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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 ozlw8t . (z9tp 4m7thlsjym ).sf a hill with an initial speed of 4.0 m/s. Neglectings8. mhlpjw74 t( zm.)t9ltsyz friction, how fast will she 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 ground level with a kineti, cx8./vknvfnqr *u c-lud12hc energy of 40 J. At the exact top of its trajectory, its-81,c .*hx l uvk/unqvr2fndc 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 jhdh1,0ibo fnd6wy.545 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 30 m above the bottom of b 5 6f.j1wo0dd,hhyinthe 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 speed ix, /9o)riznk of 25 m/s (See Fig. 6-2). Neglect ioxn)r zi9k/, friction, what will be the speed of the 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 object with a constant velocity of 5.0 m/s. Wno-x*ri1 / ntp t-iorp n/1n*xhat power must be delivered to the object by the force?

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