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 theom:-sm /0w 4/8n lvefca ok 6h4j9whxa4a4ajkir car can go "from zero to sixty in 8 s". This is a desc9awhxk 4oaejk8fcl4j sna4:/mv0o-mwah46 / ription 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 travel80jz vpe -k5e2 ue9dyring to the East (+x direction) begins to slow down as it approaches a traffic light. Make a state0p 8e yjuk-re z9v25dement 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 acceleratin1a5legl 5o y2on is zero? Support your ans aoy5e2l1nl g5wer 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 s+c0p4:l.nfjr0zkn)t e+ et+jn yr k ;itart at rest. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. Whfrntney0+ . +kc;+j pi:nktzjerl0 4)at 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 thrown straight up. Make a statement about the velocity an)p64o, jc/lfeii z n:sa oprp6e1um,5 d the acceleration when the ball reaches the highest poi6izan lo e:j)icpf,ppso 6e/5m,ru 41nt.

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 topo rjbf,;gr +hlr;y,0exu;x7eurk*p. of a building. One second later, ball B is dropped from *xr k yh.;j eerl rrubg+;u;,fp,o70x the same building. As 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 and accems )jjj16xwic0bx ngw(td..j,gi( xkv x7**qlerates 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 constant acceleration o3/ ccwrpjnhmuzm09 gz4w f;o 9 d8w6p9f99/nw9cwfhm; 3 0gmu6 wopzz8p4 jrdc $2.0 \; m/s^2$. 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 ix 8 km43huslcd js2d-+*ovk:a speed of 15 m/s on the surface of planet X where the accelerati+dcvsk4ml8-:i 23jk dohxus* on 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 strai2ft+3lpk-dy s1fq x jnu00qh 9ght up with a speed of 30 m/s. (only fill in numerical value i-ky9u qdfjnp0q h120tf xl s+3n 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 = 5.5g s.nn g,qt e*t 5s.zle:m/ge) 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 acceler)vo zq7t- fb)sation 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 resultant x0nlbsfq 8b(3 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 wilff ,7sgaw1gk9 l

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 suddenvgo1:n 33pwktwhh6a6 il3 v4 qly turned off, whil4ot:q3phh1vgl 3iaw6 3nv6 w ke traveling in empty space, 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 accele/ gnnup.* c 7sb6rpz*iration a. What acceleration results if a net force 2F 6bu cpingn/ rs z.7p**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 collides with a 1500-lb car and causes a lot of damage t5;egij bak2 t23 i:f6-tyjlfto the car. Since a lot of damage is done on t tf2iji 5fkt-tjgl6;:y2be3a he 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 Earth pulls on this object with mu )b,irj+isj:fb4 3h force mg, which we wilr )3,js4i+fibu:hj mbl 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 feather fall to the earth at their respective 8ng7 q ;mp-xidterminal velocities. Which object experiences the grea7 pdx m-8gqn;iter 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 the wr8u:5* z;7sehqj15bhorvh l: a jz9eceiling of an elevator. The elevator is moving upward, but slowing down. j:9 e5shhbh ejqvouwrzla*87;5rz :1 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 veloc4m flcp5rx/ l/ity. Thus we can deduce thatlc/mpfr 4x l/5

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 elevatorpwcd 4ob-gy0ra 0d6cw*jsl( c v/9m 4w. What will the scale be reading when the elevdmo yc0jg*dal 9 4bw0rwv/sc6(-p4cwator 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, if M = 0.60 kg andpkxsf:p7f7qy.t *t:z x 1b)ih m = 0.40 kg, what is the magnitude of the acceleration of the system? (Ignore frictionf1*7f :q7xztt p.pbksyxh: ) i 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 horizoq, gnu6 fx)2s06 mhoegntal floor with a force of 100 N in a dixm6eso2n g,h0uq g6f)rection 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 Figlk /uec4 ;zh 2kbibdpgi7u5 6g 1wj5p+eh9aj0. 4-2. What are 7 u hbwa0p6ehj;eg4kjl b9p z1d/5iiku2 g5c +the tensions in the ropes?

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 an 0o.u8pq,jn c zif-qf;d 2m are in contact with each other on a frictionless surface. (See Fig. 4-3.) What is the acceleration of the more massive box zif-,j 0u.focn;p8q q?

本题所包含的其它图片:

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 5.0g s2.rhy5uw e6v*/ yav 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?

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 po k-m:gpl.qt4m + vg: 9f4gzvinclined at an angle of: -lt9+o.zgv:gmgp v fkqpm44 $30^{\circ}$ 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 assgr* * vw9 e0jafkea-h25 fl)pt** xqp hard against a stationary brick wall, the amount of work you -p g)5j9*kq*2lasexp vfewfhra** 0tdo

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 a 1z5;tzel 0 m*gd0-N object, the amount of wor5le dtz0;mgz*k 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. Compare theia93,2 mtx8jn8vy xn u sign of the work done by gravity while the ball go9yjn iax8u8t,x3m2n ves up with the 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 as much as 9l l+/xdcy3+ ;yojf/ m wmuxl2a car, and is moving at twice the speed of the car. Which statement is true about the truck's kinetic energy compared to that of the calm yyf2xj9u;+lw l xcmo3d//+r?

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 speed 2.0 m/s.; hji)k /*vhez 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 stoppi ; )h*hijzk/veng?

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 nebo:wf rvx0xvu*5c k +9bt 0om44qqw a;gative 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,zgo3adr- lq +ryz:)a o7/ylq1/ds3r c to its potential energy 1/ +srq ag/oly drca)3lz 3ydqzr-:7oU.

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 y;cco5a-lufcs:waqn.6* y v; times the work in one-third the time. To do so, your power output must 6.cc so;5- uawf*yvyna;l:c q 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 m 57:vvff as6)g5nkx kaoving at 25 m/s, what distance is required to stop a car moving at 50 )n6 :vffkga v57 xk5sam/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 offfjeg9*wigchz6ofiuz)792 w- 9k0 o c f the top of a hill with an initial speed of 4.0 m/s. Neglecting frictiw ef9 2z*cuh906 -i w)i z79ojgfcfogkon, how fast 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 10 fhs6/ho2 ob-u m- lvb5N, blasts straight up from ground level with a kinetic energy of 40 J. At the exact top of its trajectory,ol- /uvmhfbbs - 2h5o6 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 (S)bbvz2 brv;-k o.mr1wyhr 14hee Fig. 6-2). Neglect friction, what will be the speed of the m4r1wov)yrrh b2-b zbhvk.1;roller coaster 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 point 30 mn )4z n:au*sevya8 zu; above the bottom of a dip with a speed of 25 m/s (See Fig. 6-2). Neglect friction, what will aau:v)* 4 z;ey uszn8nbe the speed of the roller coaster at the top of the next 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 of 5ty )j u()pxi tb/2et8r.0 m/s. What power must be delivered to the object bytetx i)tr 8b(p2 /uyj) the force?

A. $0.50 \; W$

B. $1.0 \; W$

C. $50 \; W$

D. $100 \; W$

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