Grade 9 Test on Mechanics 20241217 - 无忧得胜-网上国际课程 (5edu.win)

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 + f.qpd;huo1my (d8 qfnepl(ofy5/0d that their car can go "from zero to sixty in 8 s"fppd ;l(myuq5oh( /o+nfed18.yd 0f q . This is a description of

A. average speed.

B. instantaneous speed.

C. average acceleration.

D. instantaneous acceleration.

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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 (+xk7kv0+cy9sn+o,2ir/ g gh vaifih;i0 direction) begins to slow down as it approaches a traffic light. Make a statr0i sfhagvh+,k+2 7ii n0/i9k; y gcvoement concerning its acceleration.

A. The car is decelerating, and its acceleration is positive.

B. The car is decelerating, and its acceleration is negative.

C. The acceleration is zero.

D. A statement cannot be made using the information given.

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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 acc: 6 kx)cp5+ k,nsz g)5tylmwkxeleration is zero? Support yt knxw6:xzc ly) gk 5sm,k+p)5our answer with an example.

A. no, and an example would be an object starting from rest

B. no, and an example would be an object coming to a stop

C. yes, because of the way in which velocity is defined

D. yes, because of the way in which acceleration is defined

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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/o nz;dwvx;fl b(6t,wr y4h4d at the same rate. However, object A accelerates for twice the time a 6;/xby;r4 n(dzwt4,owh vflds object B. What is the final speed of object A compared to that of object B?

A. the same speed

B. twice as fast

C. three times as fast

D. four times as fast

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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 throt7oxk0t90yt ls(a:4ki iiu ly3 wtrm39cc o3 )wn straight up. Make a statement about the velocity and the3cikwi:k4moolt 9ix 7)t ul3tryy(03c 09sat acceleration when the ball reaches the highest point.

A. Both its velocity and its acceleration are zero.

B. Its velocity is zero and its acceleration is not zero.

C. Its velocity is not zero and its acceleration is zero.

D. Neither its velocity nor its acceleration is zero.

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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 rvk: ma m5e)q7gj*0bxthe top of a building. One second later, ball B is dropped from the same building. Aa m 50gxeb v)7mrjqk:*s time progresses, the difference in their speeds

A. increases.

B. remains constant.

C. decreases.

D. cannot be determined from the information given.

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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 s.hc*a6s v/ ftand 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?

A. 20 m/s

B. 16 m/s

C. 12 m/s

D. 10 m/s

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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/x**hb: c-aa),xka hhqs experiences a constant acceleration o* *:h- x,xbacqk hha)af $2.0 \; m/s^2$. What is the cart's displacement during the first 6.0 s of its motion?

A. $10 \; m$

B. $55 \; m$

C. $66 \; m$

D. $80 \; m$

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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 surfac1qz9a9 9rczoj q 8fuiy 4(zdq0e of planet X where the accelqicr(j0q 18q9zzuao9 dfz9 4yeration due to gravity is $2.5 \; m/s^2$. How long does it take for the object to return to where it is thrown?

A. $6.0 \; s$

B. $8.0 \; s$

C. $10 \; s$

D. $12 \; s$

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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 f- l7y 0 *xwosiv(idw6wp3r(nfill in numerical value0 l-s(i wp6dfi rx(wvn3y*ow7 in 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 at t r48 q4o4us9ds ;2dh uvzd2 yav= 5.5 s?

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A. 0

B. 10 m/s

C. 20 m/s

D. -40 m/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/ y ; l93/ir/ pg8zxqjqcmfeu+pw+es6 acceleration at 1.0 s?

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A. 0

B. $2.0 \; m/s^2$

C. $-2.5 \; m/s^2$

D. $10 \; m/s^2$

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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 resu pda0 y7/z*kdx ve53ufltant force on you is

A. zero.

B. up.

C. down.

D. depending on your weight.

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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 wijdz -9tu,hd*nll

A. stop immediately.

B. slow down and eventually come to a stop.

C. go faster and faster.

D. move with constant velocity.

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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 sudr*zp, q1 f0twwdenly turned off, while traveling in empty space, the starship wilr1f t z0wq*p,wl

A. stop immediately.

B. slowly slow down, and then stop.

C. go faster and faster.

D. move with constant speed.

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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 accelera2fk y9b*y(px ttion a. What acceleration results if a net force 2F acts on mass t*2(yfky p9x b4m?

A. $a/2$

B. $8 \; a$

C. $4 \; a$

D. $2 \; a$

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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 collidn w j39e(qwn r 8we)(swy-x5qies with a 1500-lb car and causes a lot of damage to the car. Since a lot of damage is donsnn5w8iwxy3e )(9w qje(-wq re on the car

A. the force on the truck is greater then the force on the car.

B. the force on the truck is equal to the force on the car.

C. the force on the truck is smaller than the force on the car.

D. the truck did not slow down during the collision.

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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 Earrt5ak4e 8s3+pk1yx z pth pulls on this object with force mg, which we will 1x4kz 3kpyatr8sp +e5call the action force. What is the reaction force?

A. The table pushing up on the object with force mg.

B. The object pushing down on the table with force mg.

C. The table pushing down on the floor with force mg.

D. The object pulling upward on the Earth with force mg.

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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 respect8ha49llk3nl-hv x (bcive terminal velocities. Which object exb -9hn4l hc(3k v8alxlperiences the greater force of air friction?

A. the feather

B. the brick

C. Neither, both experience the same amount of air friction.

D. It cannot be determined because there is not enough information given.

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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 hang6;eb ar x*gr,puz 5s+king by a string from the ceiling of an elevator. The elevatorz gs*kxr5 u+6rpea, ;b is moving upward, but slowing down. What is the tension in the string?

A. less than mg

B. exactly mg

C. greater than mg

D. zero

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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 velocitycf + -pbp, (wvi2by93wnb rd.tyuue .:9 vtfu). Thus we can ded +bvd vf9)-u.2b,w( wufet3:cprt yn9p .uyb iuce that

A. a frictional force is acting on it.

B. a net downward force is acting on it.

C. it may be accelerating.

D. it is not acted on by appreciable gravitational force.

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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 elevatm *;4a ttmaq(7v nne*e7y acr1or. What will the scale be reading when the caat*74yn *eqm 1aevn( t m7;relevator is accelerating downward at $4.00 \; m/s^2$?

A. $196 \; N$

B. $284 \; N$

C. $676 \; N$

D. $480 \; N$

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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(4 kacatrjd5 1, if M = 0.60 kg and m = 0.40 kg, what is the magnitude of the acceleration of jrd4at a(1k5cthe system? (Ignore friction and the mass of the pulley.)

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A. $5.3 \; m/s^2$

B. $3.9 \; m/s^2$

C. $2.0 \; m/s^2$

D. $0.98 \; m/s^2$

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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 kwli*y1l vq)1rm4:t g floor with a force of 100 N in a directi*w:gkr i 4)ym1l 1lvtqon 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?

A. $1.5 \; m/s^2$

B. $1.9 \; m/s^2$

C. $2.0 \; m/s^2$

D. $3.3 \; m/s^2$

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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 in Fig. 4h+mgi 33bddhu h 3f6)n-2. What are the tensions in the ropes)d3uih gn 3+fm6h h3bd?

本题所包含的其它图片:

A. $50 \; N$

B. $63 \; N$

C. $66 \; N$

D. $83 \; N$

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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 frictionles: fw i+f0 o4 llnvj68a: (ie;ohr;jkl ieyn.2fs surface. (See Fig. 4-3.) What is the acceleration of the more massifrei f v il(:a8nfn:ojoi.ew+; h4klljy2 6;0ve box?

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A. $F/m$

B. $F/(2m)$

C. $F/(3m)$

D. $F/(4m)$

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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 resta;igskv5f l-4 ta,c,j, at a rate of $0.50 \; m/s^2$ in the positive direction. What friction force acts on the mass?

A. $2.0 \; N$

B. $3.0 \; N$

C. $4.0 \; N$

D. $5.0 \; N$

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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 i(uhfupj c o2( k+w5/gvnclined at an angle ofpuw(ghu/c 52jv (+kfo $30^{\circ}$ with the horizontal. What is the object's acceleration?

A. $0.50 \; g$

B. $0.56 \; g$

C. $0.87 \; g$

D. $1.0 \; g$

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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 asb-i:qnni4tf :76 tgij hard against a stationary brick wall, the amount of work you df46 it7inb :gjqi:nt -o

A. doubles.

B. is cut in half.

C. remains constant but non-zero.

D. remains constant at zero.

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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 )r 45lito- um- ijoci6a 10-N object, the amount of work yo 5t oir-cil4-mi )ou6ju do is

A. more than 50 J.

B. equal to 50 J.

C. less than 50 J, but more than 0 J.

D. zero.

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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 the work done by bimd p,//bc x 7,vct7tgravity while the ball goes up with the sign of the m tb7 c7vc,bp//t ixd,work done by gravity while it goes down.

A. Work is + on the way up and + on the way down.

B. Work is + on the way up and - on the way down.

C. Work is - on the way up and + on the way down.

D. Work is - on the way up and - on the way 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.xwmil;o b)o8 the car. Which statement is true about the truck's kinetic ener.w)mboi x;8 olgy compared to that of the car?

A. All that can be said is that the truck has more kinetic energy.

B. The truck has twice the kinetic energy of the car.

C. The truck has 4 times the kinetic energy of the car.

D. The truck has 8 times the kinetic energy 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 wkkpk+f +2m)jwith speed 2.0 m/s. A 1.0-kg mass is moving with speed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Which object travels the greater distance before kk+) wp2jk +fmstopping?

A. the 4.0-kg mass

B. the 1.0-kg mass

C. Both travel the same distance.

D. cannot be determined from the information given

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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*;+phzk9 5 rxuklh:e o negative potential energy?

A. Yes, as long as the total energy is positive.

B. Yes, since the choice of the zero of potential energy is arbitrary.

C. No, because the kinetic energy of a system must equal its potential energy.

D. No, because this would have no physical meaning.

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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 pokn0mzgx z2 rb503/syq tential energy k5r0m 03qxy z2sz gb/nU.

A. K increases and U decreases.

B. K decreases and U decreases.

C. K increases and U increases.

D. K decreases and U increases.

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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 timesd -:ylk ;io je)* z4h4csjdh8l the work in one-third the time. To do so, your 4 ;:dk8s4hyl ch )o-elzj *jidpower output must have been

A. the same as yesterday's power output.

B. one-third of yesterday's power output.

C. 3 times yesterday's power output.

D. 9 times yesterday's power output.

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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 distancr4 xs: er9o ,zl+wmmg(uu8as 9e is required to stol98s wsg zr,m: rmx+u (4oea9up a car moving at 50 m/s under the same condition?

A. $50 \; m$

B. $100 \; m$

C. $200 \; m$

D. $400 \; m$

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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 witf8xi5va oqq2 33qznz9 h an initial speed of 4.0 m/s. Neglecting friction, how f832 qzq 3zqf xovai9n5ast will she be moving after dropping 10 m in elevation?

A. 7.3 m/s

B. 15 m/s

C. 49 m/s

D. 196 m/s

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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 1h cm v (xp-8 d49q4fgaf 0uwwd/.hx3nm0 N, blasts straight up from ground level with a kinetic energy of 40 J. At the exact top ofgm f/8.x mvw9xhndh3fa44 d p(cq w-u0 its trajectory, its total mechanical energy is 140 J. To what vertical height does it rise?

A. $1.0 \; m$

B. $10 \; m$

C. $14 \; m$

D. $24 \; m$

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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 startsyxns50ueq 1+sq1 oq+ m from rest at a point 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 s+ sq51nuqy+mx0q o1ethe next slope, which is 30 m above the bottom of the dip?

本题所包含的其它图片:

A. 14 m/s

B. 17 m/s

C. 24 m/s

D. 30 m/s

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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 atbi zax i/72dln 2bhoo:);t/rw a point 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 nextdh:; rait/ )zb l7w/ni2o 2oxb slope, which is 45 m above the bottom of the dip?

本题所包含的其它图片:

A. 14 m/s

B. 16 m/s

C. 18 m/s

D. 20 m/s

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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 o0ohe+ie:n 79eq3w nu yf 5.0 m/s. What poyqw+o h:nie037u ee 9nwer must be delivered to the object by the force?

A. $0.50 \; W$

B. $1.0 \; W$

C. $50 \; W$

D. $100 \; W$

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