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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#
 
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 1 1npuoh lqe+;"from zero to sixty in 8 s". This is a e;1opqunhl+1 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 thkadq-4jm v 4:me East (+x direction) begins to slow down as it approaches a traf4 4mkq-ajm:vd 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, do kgf2o2ny3i k*q -.9f yomw+d)ewxn m5es it mean that the acceleration is zero? Support your answer with an)g k9qyf.x -diwm5w *3y mnn2+fooek2 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 start at rest. They both accel9j n)1nrqs( zcerate at the same rate. However, object A accelerates for twice the time as object B. What irq1jc szn 9n)(s 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 s6 +mukzw(6a hdtatement about the velocity and the acceleration when the ball zm(kwa6 h6 d+ureaches 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 a building. One second later, 94omxy(p: cavzy( n2ar0aa+a ball B is dropped from the same bu(pamn4 yrcz2xa+0: yav(a ao9ilding. 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 ret qc7v4/ blba60;uz4uef-unzst and 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 ex q1,p ec.t-edfperiences a constant acceleration of c1fdep-eqt ., $2.0 \; m/s^2$. 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 pw vz2 ;b4 l.w s60:ezvnmnbh0glanet X where the acceleration due wzv v06:4gl .wn2ez;m0b bs nhto 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 numer)tm .s 9a(qmru6ds 5nqical value in the dm 5u 9) (6aqmn.sstqrblanks)
(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 thew(qrt u*f q7v4*jo q2+fizd* e 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 acceleration at 1.0 i e+7hpd6gwg .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 chair4jh34yrxwdldrp*) 2 i , the resultant 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 movingz661rj)zeten./n b 5ht (ke xx 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-PAIzy:xy3 n); fngN-NO-GAIN are suddenly turned off, while traveling in emp) gzx:nf yny3;ty 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 produ3mk n n +ncay,2/dhyk9ces an acceleration a. What acceleration resul23 n /,d+ykkcnmy9 hnats 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 150xpdftq.-wf j/gl:k3 3vgt+, q0-lb car and causes a lot of damage to the car. Since a lot of damage is done on tqxl . kg3v djgf+f-tpw3/,:qt he 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 p*q( ++vwb9e xwicj g-gulls on this object with force mg, which we wi9+(vbxi*c g- qwgjw+ell 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 tow g+rnmtn.. 7r.am7o* jrauuqv,k/5g the earth at their respective terminal velocities. Which object rrgjrut.,..7 7uw5 + aqan/ mgnm*kovexperiences 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 string from they dn ;v h3(ke2jt: 8aeuqk914rn4wde a ceiling of an elevator. The elevator is moving upward,k kedeav3nj9r t8(1d4h ;w nu:q42ea y 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. g*:zgnlcf( k/Thus we can dedunc ( *glzfkg/:ce 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. Whath.vhtv4t d8*q will the scale be reading when th 4*8qdtv.hhtv e elevator 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 = 0.60 kg and m = 0.40 kg, what j (5,oklevswj0/ *h nzis the magnitude of the accelera 0hnskj,5 (l/z*ewojvtion 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 xzgd*e:r 75xwoz;/t u99ntef force of 100 N in a directi9z/ex5 :7rtxt9e* f;zo gundw on 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 3l ghj;t l/5/bxm.d wqN is supported by two ropes as shown in Fig. 4-2. What are the tensions in the lg j/x35bq w/dl;h t.mropes?


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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 on a friqly 3whf-yq 94ctionless surface. (See Fig. 4-3.) What is the acceleratl4hy9-y 3fq qwion 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, fnozjq9.g xa)nvz v1k- 0h69wat 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 p.ilrsob xr:/b9lw 0l) lane is inclined at an angle ofl:9lb) swor.ix b/rl 0 $30^{\circ}$ 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 work yo;e nt1 5xqg8iau dxga5iet q1n8;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 u/mtj:8 yhe8bbg/q x7at a constant velocity carrying a 10-N object, the amount of work you doqtb/u8 m7xh:/e j8ybg 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 txbs7*f +ii93h) awbvihe work done by gravity while the ball goes up with t bv9i*hw+i f 3)7basixhe 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 )rl;oarn 1-jezn/eh5 as much as a car, and is moving at twice the speed of the car. Which statement is true about the truck's kinetic energjr oerh ;)-ezl a1n5/ny 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 mlou*mo .j(j h;s+:ys sv7. tyfass is moving with speed 4.0 m/s. Both objects encounter the s.l.m*7+ujfjs:;y( htsv o o ysame 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 symu(hla hd9+7k+lz9n vgm 7m 5nstem to have negative 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 ener1 rd*t rcybsaq;+h .+ogy K, to its potential energryaob+; +q1d*trs.h cy 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 do so, isv* zwiz(xb7h d5(+u your power output m5w b((id+ zuh vx7is*zust 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, wha04y,rpki lqt2k0 bou)xt *dq-t distance is required to stop a car moving at 50 m/s under tp0o y,q)u4xtt0k l2r kib*dq -he 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 pyt +i8dr8 7za4.0 m/s. Neglecting friction, how fast will she be mov8 ztyip rad+78ing 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 frob b(l djavl+x4 7o:mumea0* o:m ground level with a kinetic energy of 40 J. At the exact top of its trajectory, its total mechanicalo* mbbxl: 4 (e:+ajamodlu0v7 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 above thi :;8tc xy2iwikaqs7c( qoqcr 5a;64xe bottom of a dip (See Fig. 6-2). Neglect friction, what will be4ait ci o 75qr 6:;c;8(xqcwy2 qxksia 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 bot1uirxt o4 tyjz*)y+q ./(jy wytom of a dip with a speed of 25 m/s (See Fig. 6-2). Neglttz4oy)+ u.*qryy(jyx1i wj / ect 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 cons;jh;a/1s,6 o ehpwde2gu3 jyxtant velocity of 5.0 m/s. What power must be aodhy he 3,uw /;ex26psj1gj;delivered to the object by the force?

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