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 that their car can go "from zero zq yjvrq.h18 xbx7p0 (u zx6y9to sixty in 8 s". T196.yzr xzbhjxvq 0( y8pq7uxhis 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 theend6mtm*.0u ka87e af East (+x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its accelerata7faetk0um .mned6* 8 ion.

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 acce7o as*s4 *2: ps.ygmlr4py sxkleration is zero? Support your a**.r4ylsp go7sxy k:ms2s4panswer 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 accelhoa bk4i ih0s5g7y, jjq(bqgw*mk7 /* erate at the same rate. However, object A accelerates for twice the time as object B. What is the final speed of object A compared to that of objomig/i, b g4jhah7sk7*0*(jq ky q wb5ect 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 thrown straight up. Make a statement abom7cdclu1 s 1z-ut the velocity and the acce1c1 s-ldm7uc zleration 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 the top of a building. One second later, balx tl-b/u51+nmc8dhs u l B is dropped from the same building. As time t1dmnu h8-bc/+u5lxs 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 ryhn/0 g+1fdcr est 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?

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/s experiences a constanie(c y az(;.nnt acceleration on;y.ziaec (n(f $2.0 \; m/s^2$. 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 surface of plapg6 x)t x4n5qw)ibvt 7net X where the acce)v4tbpxngxi )wt 57q6leration 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. (one .ztj w7q ndvi*w.f45ly fill in numerical value in the blanks) * 47dj.qw5zf itnwv.e
(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 = 5.0+rvv )yfn bg)hji f0q52cmv85 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 acceleration at ;yd+ipvaq;d21.0 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 resultant force on you il7gov5f ntp5cog8bqcp r b(2, ),gn.o s

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 objecwp xr29.iuzi8 ; dmrr-t will

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 areab2qi 72mbczkmf4 .s9 suddenly turned off, while traveling in empty spafb9 7ac4 s2z2b.miq mkce, the starship will

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 acceleration a. Whm/on u5ta.yuu/ vq)-di0ys8 ( 2 nyrcmat acceleration results if a net force 2F0 cn/m- 8yyqa)t 52im no vusrud(/y.u acts on mass 4m?

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 collides4mkgtqny) ) e9 with a 1500-lb car and causes a lot of damage to the car. )m4yte9kq)n g Since a lot of damage is done 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*-k8q92hmu av w4zo/b z/zwsqosd 7u7. The Earth pulls on this object with force mg, which wubksm q/zao7zwd 89o2w -7 4*/zsvquhe will call 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 feathe5hfinq: q;37ocna p:r r fall to the earth at their respective terminal velocities. Which object experiencephq:cr nn3ao7 f:5;qi s 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 hanging by a string from tfn. ve:n(0 x y9stazpc1; lu4vhe ceiling of an elevator. The elevator is moving upward, but slowing down. What is t zn lspy vn4a;fvut(9ec0:1x. he 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 veloc h5grac x-.2.la,jgaq ity. Thus we can deducr -hc xlq.2,5.agjagae 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 o30n(p0gngawo9m 0* hbz1io8z (as bkin a scale in an elevator. What will the scale be reading when the elevator is accelerating downwa0 *sizab k1bga93h o(wz8 i0 nno0(gpmrd 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, if M = 0.60 kg andpq9 vczaw5mj7f8n 09+ eesr7p m = 0.40 kg, what is the magnitude of the acceleration of the system? (Ignore friction and the masrwzvp js9q 5789ne +pe f0ac7ms 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 floor with a force ofa8 vqmmpls7vo2n3.j) 100 N in 2 pam.mq) 7lo3 vjnsv8a 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?

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 7:s bwtt/j0bxis supported by two ropes as shown in Fig. 4-2. What are tht7t:s wj0bx b/e tensions in the ropes?

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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 in5mwditn z)x t )nkyu( e8+gb nu05wt00 contact with each other on a frictionless surface. (See Fig. 4-3.) Whkxu5ntzw 5tynm80)0+wn)g d(ie ub0 t at is the acceleration of the more massive 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 a7k 9gp9bi)nu0 q* pcxy-lmbk.ccelerates 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?

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 frictionlesqdp.li-xosdjyr drv-i)/ 2p8w 3- ju/s inclined plane. The plane is inclined at an angl)l3 -i/ pj ddr28swjq-/ry dup-.iovxe of $30^{\circ}$ 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 as hard against a statio30v1eck ommp 9*z,w ebnary brick wall, the amount of work you domb,z9ev1 *ew p30o kmc

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 car fq:4ulu3 bc7trying a 10-N object, t4uuq7b cftl:3 he amount of work you 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. Como h1oc6o;r qp)pare the sign of the work done by gravity while the ball goes up with thehqr;6oo o1p)c sign of the 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 w0p 7xf6+o9 jgx -a,m ecu)uryas much as a car, and is moving at twice the speed of the car. Which statement is true about thj ,- wf9oxygmx r06pu)au7+ec e truck's kinetic energy 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 with s,cba;q0j:. mn1uyvcw-i c(v x peed 2.0 m/s. A 1.0-kg mass is moving with speed 4.0 m/s. Bothy cm ; :-xvnqwj0ub( 1c.c,vai objects encounter the same constant braking force, and are brought to rest. Which object travels the greater distance before stopping?

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 ,m,5oqo pnwq:6 6yr zwsystem to have 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 potential rwbbj4. ):rdo energy j.)do4bb r: wrU.

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 times the work in on -x qga e.w6i(3bnvs)je-third the time. To do so, your power output mueqnxj- ivwab(6)g3 s.st 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/sy rq/r/a0 1amxw s):av, what distance is required to stop a car moving at s/wmra:ra0ax/q vy)1 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 hy p(,uz;vl zrqo:z(9 till with an initial speed of 4.0 m/s. Neglecting friction, how fast will she be moving after dropping 10 m oz(q,:(9ylp rt vuz z;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 10 N, blasts strayj/h r q1f-:bcight up from ground level with a kinetic energy of 40 J. At the exact to:f y/q hbjc-1rp of 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 starts from rest at a point 45 m above the bottom of a dip (Sxz 3hb ,bc*,free Fig. 6-2). Neglect friction, what will be the speed of the roller coab,3 bcfhx, rz*ster at the top of the 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 at a poin .qpt0sgd5e2s yr xn;ocfpqq :)6c5-o t 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 next slope, which is 45 m s qs-:) cpyg;fcetpqx 2o6rqn5.0 5do 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 vemct mfgg*w4u02yb h3 /locity of 5.0 m/s. What power must be delive03/fgm*c2b gmuh4 ytwred to the object by the force?

A. $0.50 \; W$

B. $1.0 \; W$

C. $50 \; W$

D. $100 \; W$

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