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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 that their car can go "from zero to sixty ifx1myb:a3-pq:nt qf+ v4fkz+n 8 s". Thpt4yq:vfab +k+q :xn - z13mffis 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 East (+x dihe6:4(*s , r)v7xutya qikjcwrection) begins to slow down as it approaches a trafuec,k*hr7xyv t6w iaj:q)s (4 fic 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 skv,eany.f: 7gp2m o 9mean that the acceleration is zero? Support your answer with aemg:yv op2. k nf,s7a9n 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 ,wey+ine*8f astart at rest. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. Wha w+ e*ne,iya8ft 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 velocity ayg5b; gc*2 1 ejvvxwz7nd the acceleration when the ball reaches the highest ; vjgevy2*w 7 bxzgc15point.

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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 frommrv/+ 56b coiz the top of a building. One second later, ball B is dropped from the same building. As ti5 +zmvro 6/ibcme 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 i . expyj+ad1.z+ +z egm)jy9cand 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 experiences a constant accelerat +wn+1i bs9llxion of 1ls+lw +x9nbi $2.0 \; m/s^2$. 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 o93 2a2syx ymn r;nd1xrf 15 m/s on the surface of planet X where the acceleration due to gravity is dyx2 3rnns9; y1rax 2m$2.5 \; m/s^2$. 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 va *hc ejm*c n5:zi6hsz9g-dph :lue inm5hen pg*-c 9*zh :shcz ji:d6 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 at7j/o dqvh b7;s 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 accelera( fvu (fc.f 23nyfcg4 on/nki*tion 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 force on -bp;t-3s7ueclen 7nngx .5(ftj k;m y 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 movingin icc( b1vptxu.);f7 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 suddeqx* e92 favi,ynly turned off, while travey2efxiv* ,a9 qling 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 massl7dx*s++( ac dt jn.nz m and produces an acceleration a. What acceleration results if a net force 2F (+t nzdnc.7d *xj+lsaacts 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 causesfrh -kg3xv m0/ a lot of damage to the car. Since a 0mgk3 -hr /vfxlot 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 with (d zsfn3f; cu21qwln1wi64o hbks .;b force mg, which we wilbuow;6l bdi; s34hn2k cn q1wz.f1(sfl 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 feathe0lrv1xlc0gt gx* f.( sr fall to the earth at their respective terminal velocities. Which object experiences the greater force of air frictio0 sv(c0*r t x1.lgfxlgn?

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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 elevaprn;,*n bda6-c sm( rotor. The elevatornpr* (,r6nomas-; c bd 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 incline /crxgkfk ,t/6d ramp at constant velocity. Thus we can dedur/gc kk/xt,6fce 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 a80pz)o/ vzuoqn6n.s scale in an elevator. What will the scale be reading when the elez n6vq)/ p.s0nz a8uoovator 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. 4-1, if M = 0.60qj)j7p/3d nf y kg and m = 0.40 kg, what is the magnitude of the acceleration of the sys7npj) q/yjd 3ftem? (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 ktilp i7qlv67))xws + 100 N inwx)i7v kp ts7li+q6 l) a 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 wf rtrs f5p-g7,;fgk6fbna b8dwi2.y) eight 100 N is supported by two ropes as shown in Fig. 4-2. Wdgff5.k ,yr;n)tawr 2fs8ip7b6- fgbhat are the tensions 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:mfb.ebdv b ** other on a frictionless surface. (See Fig. 4-3.) What is the acceleration of the m:mb*b. dvb*f eore 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 t8k0xr vw f- n(s,d0wducu 4p,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 plane is inclined at a3qzy4*kcq ;tzevej 2 )n anglejze 2yt) qqzec *4v;k3 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 brick wall, the amount of workmnb)dziv)m. r ;lac7 ulr; 52p you r b nlcpm5z;du) 7i )rml;.2vado

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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 velrd9 ;-ak7aqqek0 a10uu4,j4 x(mm mmf;wgd gp ocity carrying a 10-N object, the amop g9-rw1mum(a 4k ,agufm;kxqed0a0qd;m7 j 4unt 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. Compare the sign of 01x.q e cw5 uf jx6ua;*bt3muethe work done by gravity while the ball goes up*jt 0fu.x5uq3uac1 ewb ex 6m; with the 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 movinx :12ius71+ rhpjxh6ovo g 3aag at twice the speed of the car. Which statemen +1o7gosx61jxuhr3vhap:2i at 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 +c -dhenpo ,q2m/p:fo moving with speed 4.0 m/s. Both objects encounter the same constant braking force, and are be :/mp-o+f, hqpo ndc2rought 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 negzoz-1 x2 mvey1ative 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. Compar 9+lsg*jzr2s te its kinetic energy K, to its potential ener *r2lj9sz +tgsgy 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 tir5d5tvf2 *pdi9 nok ,f/m5asp mes the work in one-third the time. To do so, your power out 2*fofp,pvid5 nsa/5k9 m5 rdtput 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 moving at t9nqm9 u-b ia0* 80cknn +mhqj25 m/s, what distance is required to stop a car moving at 50-c90k qn u j89qn*i+mb0 htanm 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 kq8 6h6lopj o3wg, pushes off the top of a hill with an initial speed of 4.0 m/s. Neglecting friction, how fast will she b3o6 6ljo hqwp8e 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 fronj k. d(cz98xqon1ce9m ground level with a kinetic energy of 40 J. At the exact top of its trajectory, its total mechanical energy is 140 J. To what vertical h cckj9o e1nq(9z.dx 8neight 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 poin tclzr7k7ql yyl+- y6/t 45 m above the bottom of a dip (See Fig. 6t7lcl /kzl6 y+qry-7y-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?


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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 o mbgsv18v6 )xff 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 8 6mf vgbx)1sv45 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 neede ; ) s9uc:ake;)8ptb7dvd lgppd to move an object with a constant velocity of 5.0 m/s. What power mk) dp89;uvpb;)d ge:ap 7t clsust be delivered to the object by the force?

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