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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 that their car can go "from zero to sixty in pdwo;w:rh nvw0d kf 69 1um2b.8 s". This is a descriptiodwk:p1bv ru2w 9hm; dwo0nf.6 n 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 E,o3bzz3 w u1fpdi+j)bast (+x direction) begins to slow down as it approaches a traffic light. Make a statement )b f,pzi3dbo u z3+j1wconcerning 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, does62, ltac.4,dyd ynqcl it mean that the acceleration is zero? Support your answer with an example2cq6 ltdln 4,d, cay.y.

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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 accelef:cc7m ah 2fb,4g r jar29q7us-jdyv 0rate at the same rate. However, object A,f27 uc r4ahmbv -g2cda0jr79 qyfj:s accelerates for twice the time as object B. What 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 statemenzly k(ctsg.2n 5 ,s+bqt about the velocity and the acceleration wbl,+q2zs( gynck5 .s then 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 the top of alc g*s f;t 6tbx.bh(-l building. One second later, ball B is dropped frg.6ctlfbb xt ls;h*-( om the same 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 and accelerate95 c .mkssd2kk-ij apy a5dh ,6qe2umq;pc42ts 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 accel3jh dgpj us)/;eration o3jg;)djup sh/f $2.0 \; m/s^2$. 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 witw1e*y5r4j (2e crucinh a speed of 15 m/s on the surface of planet X where the accele541n cr*we2j (yuice rration 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 val ,-wosfgr 8+rs7di)qe ue in the blan)g+w q8f7 rr,des-o siks)
(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:n:is9yxol eg 8jtp8t1w/4 qvz,8qc 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 the acceleration at 1.0 s? k iuzx )+. 3nh zf.wk*ikrt./tyw)8rt


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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 rh-f508o.nrx( el g+ngbpn mt1esultant 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 object wilyydpon q3zfw c(ky- jw20z;,0 l

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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 enginw294b2k mqarues on the starship NO-PAIN-NO-GAIN are suddenly turned off, while tra2q2m bwa k4u9rveling 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 mass m and produces an accele:lm2epa3 y: n0dogym(ration a. What acceleration resuy m ey0( da3pog2mln::lts if a net 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 collides with a 1yu owv a.gfss 0m5x s3p+4k).3v.pqcj500-lb car and causes a lot of damage to the car. Since a lot ofv0aocf suqp+.y3 5.x svw)4s 3jp.kgm 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 Eart vf15q16 asknah pulls on this object with force mg, which we will call the action force. What is the reacq vf56a1 1sanktion 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 theiijqd +, +q.v,zqb jzn1r respective terminal velocities. Which object experiences the qq1zv b,j +zq,ij.n+dgreater 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 string from the ceiling of an elevator. T hf:tvu7fv2 + nexpg29rp/) bshe elevator is moving upward, but slowing down. What is the tension9hep)n2:7fv subx2v tpr+/gf 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 inclined9 r9x a76 /qxzs 91yjjajv9xzq ramp at constant velocity. Thus we can dedaxq9jq9 y1zv69ar 7jj /sz 9xxuce 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. What wmzv207y *9 ope t6zs(-sr b tagjh8/hqill the scale be reading when the elevatorgo6yqt7 sp9 h(msvarh0-tj ze2z*8b/ 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,x xrm(y8d o4vha) tje9;2h ;eg if M = 0.60 kg and m = 0.40 kg, what is the magnitude of the acceleration of the system? (Ignore frir8mhxodet;(v92 )jaxeg y4; hction 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 sm 8 fn*cdyx4dr+tvov *7ooth horizontal floor with a force of 100 n4*t +rdxc7yf*dv ov 8N in 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 weight 100 N is supported by two ropes as shown i y02omryf2a* kn Fig. 4-2. What are the tensions in th*y 2kmyr0foa2e 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 w)m*g go6l a (2lxw+n;jaxe)zsith each other on a frictionless surface. (See n a)xog s(2)x+ * e;jgamzlw6lFig. 4-3.) What is the acceleration 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 az;b 9*d)wrfuk.st7 2m tv m5t5.0 N accelerates 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. Thod,)z35b ppui z5r.x. zhb)xk e plane is inclined at an angle)kuox b35p.x ,)5zirzh.b pdz 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 statij* azmt(aug k 8v+full. h 5e6q/ztr;n*t31uronary brick wall, the amount of work yot*e gu8f1;zahz /5mlt + jqnt(3r6uv*.akulru 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 horizontaricr-/9nw v3zaih xt2z0n8 /jlly forward at a constant velocity carrying a 10-N object, 0z/zcn / 3n axjrhvi2t8-w9rithe 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 strai4h gtc2 +k1pqn01tl:t wbrgpl(h yk67ght 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 4(rq16k tlkblpgph1t :t g c0wnh7 2+ygoes 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 is4 f27h(0q:lisez;isw b6 zx)h jmdzv8 moving at twice the speed of the car. Which statement is true about the truck's kinetic energy compa i7z)eizd 0;hs6 wmhqfj(2l s b:8xz4vred 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 mov/x seug6 38blxing with speed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Which object travels the greater dista3s6/xuxe8glb nce 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 potm1 xl;s8an5 snj5 z( *koxtt,rential 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, 8,ic; z4hd8b 8s y zlc7wn( b7-rcutvuto its potential energy48lvr,u-zu8nhy c zi8c(7tdb 7bwcs; 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 6n:z/hv*ax w.w mw2vw7j,wn h one-third the time. To do so, your power owmv: h /xnw72nh vzj* w,w.6awutput 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 25 m/s, what distance iq4z daycqk8qd6 :g; ,is required to stop a car moving at 50c yqq4z:6d 8g,qaki;d 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 6tsau6 egg ++woff the top of a hill with an initial speed of 4.0 m/s. Neglecting friction, how fast will she be moving after dropping 1tue6gg+a+6 w s0 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 u 44 gnv(ul+jwa25 qjtxp from ground level with a kinetic energy on2v4u+ xwt(5la4jq jg f 40 J. At the exact top of its 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 7mt21lqd*0 ts. p bxmhpoint 45 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 xsh.tb 1*7pm2mtdlq0 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 2hnjc pkyzh:h7fzu), j/k;:x at a point 30 m above the bottom of a dip with a speed of 25 m/s (See Fig. 6-2). Neglect friction, what wilj,:k2 ck puhzhx)j/; nh:7fyzl 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/b1u (fj:zl1z0,llqw c lc4kx4s. What power must be debkcll1c:jlwqz4 l0 fx , 1u4z(livered to the object by the force?

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