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习题练习：Physics Bowl by Topic 3: Kinematics - part II Uniformly Accelerated Motion
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 作者: admin    总分: 46分  得分: _____________

答题人: 游客未登录  开始时间: 24年04月05日 22:23  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  94.01: Starting from rest, object 1 falls freely for 4.0 seconds, and ob7)tqr;,skwxdaa a x+:wl 7 3qsject 2 falls freely for 8.0 seconds. Compared to object 1:sl adr+ 7wa;qx)t3ks7x aq, w, object 2 falls:

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  94.02: A car starts from rest and ug5gqk/e(8lwd7v o f4gniformly accelerates to a final speed of 20.0 m/s in a time of 15.0 s. How far does the car travel during thifkd7g 5wl(q e 4v/o8ggs time?

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  94.03: A ball is thrown off a high cliff with no horizontal velocity.0(pyk t zb0 1zf9hg,jb It lands 6.0 s later with a velocity of 40kt0 h zbz9y0gf1b(jp, m/s. What was the initial velocity of the ball?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  95.27: A rocket near the surface of the earth is accelerating vertically upw g:xmv29 wtr-h.0juul ard at wj.u90:h utg2v-rl xm$10\;m/s^2$. The rocket releases an instrument package. Immediately after release the acceleration of the instrument package is:

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  95.13: A freely falling body is found to be mg ui w:7bul/o7 ao,pg/oving downwards at 27 m/s at one instant. If it continues to fall, one sec,g 7ao/o/iub gu w:l7pond later the object would be moving with a downward velocity closest to:

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  95.39: A car starts xqqg4 55 a ruz4te;79j* xqvbzfrom rest and accelerates at $0.80\;m/s^2$ for 10 s. It then continues at constant velocity. Twenty seconds (20 s) after it began to move, the car has:

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  96.17: A ball which isexwtid kbbvjo*m); l n-)94-)d( osac dropped from the top of a building strikes the ground with a speed of 30 m/s. Assume air resistance can be ignored. The height of ivald )nb ;bom) ()od4 9w ksxt*-ej-cthe building is approximately:

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  97.09: At a certain time, an object in free fall has velocity 4.0 m/s in the uvpky;sny 0si,e)w t rdx3 6brj,m ;*.p(*zdqtpward direction. What is the approximate velocity of the object one secvb.0 te,) xz*y rrtk,p d;s *yq3m;pw6nsj id(ond later?

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  98.14: How long must hv sx5pfsa )w703a u6ha $2.5\;m/s^2$ acceleration act to change the velocity of a 2.0 kg object by 3.0 m/s?

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  98.15: A freely falling object i)jhm.d7k h61x+ (hhj4hhtzk:q1ytmb s found to be moving downward at 18 m/s. If it continues to fal4 hh1kmkj hqb :t6dyh7h+tx )(.z1hjml, two seconds later the object would be moving with a speed of

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  17.02: A small object is released from rest ane63yk(0udl mfvt9w t6 h u07nod falls freely for 4.00 s until reaching the grou9u0u7t 3y l(h eo0dwnf6m 6kvtnd. What was the height above the ground from which the object was released?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  11.06: A ball of mass =0.1qj/nm)4*p nadsklsx, ,sy 5 f100 kg is launched straight upward so that it rises to a maximum height of 12.0 m above the launch point. Ig yxaq s* lk jmd)sp,/,n14f5nsnore air resistance. When the ball reaches its maximum height, which one of the following choices best represents the magnitude of the net force acting on the ball?
D 10.0 N
E 12.0 N

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  11.07: A ball of mass =0.10 y2xut4hzyv3p8u 8r,n0 kg is launched straight upward so that it rises to a maximum height of 12.0 m abo48ut zp hr2xuy3,v8yn ve the launch point. Ignore air resistance. Approximately how much time does it take the ball to reach the maximum height from its launch?

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  98.31: An object sliding down an inclined plane i.)kx a/ ui1ixan/ue/has speed 0.40 m/s two seconds after it begins to slide. Approximately how )kiaa///i. ueixux1 n far does it travel in three seconds?

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  98.40: Coin I is thrown upward from the top of a 100-m towe x *63ddcvza asoh2x)b e-6v2b)0gyhlr with a speed of 15 m/s. Coin II is dropped (zero initial speed) from the top of the tower 2.0 s later. xy-)x6o *haza2b )l3gdv2vse0 6 cbdh Assume g is $10 \; m/s^2$. How far below the top of the tower does coin I pass coin II?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  02.04: If a ball is thrown directly upwards ws -xkrqs733, jw5ilnpqv:p: j ith twice the initial speed of another,n:-3rwp j skvxis,q5:qpj l73 how much higher will it be at its apex?

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17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  02.30: A box falls to the ground from aw4fc 4cbo -;6gu6v lbo delivery truck traveling at 30 m/s. After hitting the road, it slides 45 meters to rest. How long does it take the box to comccw o-g4lv6;o4u f bb6e to rest?

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18#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  03.29: An object is thrown upward.zp,k.cofa5 u;pe6d flx g2 ufdzx(33 s with a velocity of 30 m/s near the surface of the earth. After two seconds what would be the directi 352cu .p ( e6flzu.x;gzxodfkdpa,f3on of the displacement, velocity and acceleration?
displacement velocity acceleration

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  04.10: Three stones of differen1 e cg( 0kne;rf9dsk 1jj)4ewot mass (1m, 2m& 3m) are thrown vertically upward with different velocities (1v, 2v& 3v respectively). The diagram indicates the mass and velocity of each stone. Rank from high to low jw14;d(er s k e f09)cn1jgoekthe maximum height of each stone. Assume air resistance is negligible.


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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  10.25: Two point objects are launched strai yf v ;u5s708usqzryq lz*cu(h94x)f sght upward with identical linear momentum. Object 1 has mass M and reaches a maximum height H above the launch point. If object 2 has mass 2M, what is its maximum attainedz)uu9 ssl5 z4yy xvc *;u0sr8f7qqfh( height above the launch point in terms of H ?


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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  04.28: A rubber ball bounces on the ground as shown. After eachtr8jm * p* f-w;2m76ghhavvfn bounce, the ball reaches one-half the height of the bounce before it. If the time the ball was in the air between the first and second bounce was 1 second, what would be the time betwpg t*aj8m6mnw;*- vf7f vrh2 heen the second and third bounce?

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  16.21: At 1.94 s after launc:k iew ofml2*fj fp 5qeam):(7h, a projectile in free fall achieved its minimum speed during flight. If th7klp f(5f i*m fjwqe)a:2e:omat minimum speed was 15.0 m/s, what was the projectile’s initial angle of launch from the horizontal?

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  05.02: A pebble is dropped from a high vertical cliff. The collision of ,8sh(.d2n n/vfpyprb 6 to+ ntthe pebble with the ground below is seen 1.50 seconds after the pebble is dropped. With what speed did the pebble hit the ground? Ignfv,pbnr n/hs8y+tp26 n.tdo(ore air resistance.

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  06.03: Three students were arguing about the height of a parking garage. u(1kt1x4j p gzOne student suggested that to determine the height of the garage, they simply had to drop tennis balls from the top and time the fall of the tennis balls. If the time for the ball to fall was 1.4 seczxg1 j4( 1utkponds, approximately how tall is the parking garage?

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  05.07: A snail is moving along a straight line. Its ineqp t. +vufquf9qwwv) /i97w-b/ dw3q itial position is x0 = -5 meters and it is moving away from -/3w+fq/v 7 .ewfwpqqqd9u9vuw)b tithe origin and slowing down. In this coordinate system, the signs of the initial position, initial velocity and acceleration, respectively, are

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  04.38: A small point-like obje:htqkn50ez o* ct is pulled downwards by gravity (down the plane of the page) but is constrained to exactly follow each of the frictionless pathways shown. Rank these three paths from shortest to longest in terms of the amount of time (T) necessary for the object to be released from rest at point A and travel to point B. Assume that in changingkt*h:oe0z5nq direction that there is no loss of energy and that it takes negligible time.


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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  06.13: A rock is dropped from the top of a tall tower. Half a second l9.ca;o j v s/8fj.ig*tpwd5plater another rock, twice as massive as the first, ispf/ ;9wv5.osajc t 8.d lijg*p dropped. Ignoring air resistance,

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  06.18: A cart is initially moving at 0.5 m/s 8m wd61 nrwtkb1rt*twu 7b/ c+along a track. The cart comes to rest after travb*1 mtukrw7 wbt nw1tc6+ 8dr/eling 1 m. The experiment is repeated on the same track, but now the cart is initially moving at 1 m/s. How far does the cart travel before coming to rest?

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  07.11: A cart is initially moving at 0.5 m/s along a track. Th)6o6 2xmgp 2 w(fao2fbuqn.2rfs e8dae cart comes to rest after traveling 1 m. The experiment is repeated on the same track, but now the cart is initialasmdp fw(.o6g26r 8u2 22fqnaf ob)exly moving at 1 m/s. How far does the cart travel before coming to rest?

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  08.03: A dog starts from rest and runs in a, n.6yq5kz,ee oyzip - straight line with a constant accelerationyz,e -5kqein6y ,z o.p of 2$.5\;m/s^2$. How much time does it take for the dog to run a distance of $10\;m$?

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  10.29: A ball initially at rest falls without air resistance from a height h ac0mm4 vhy* r(vbcnd5+bove the ground. If the ball falls the first distance 0.5h in arv*h04vy(d + c mmb5nc time t, how much time is required to fall the remaining distance of 0.5h?

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  10.38: Two objects both move and uniformly accel,,* 80v o a;g4v-p punaccsgpoerate to the right. At time t=0,the objects are at the same initial position. Object 1 has initial speed twice that of Object 2; Object 1 has one-half the acceleration of Object 2. After some tim cgpvppaun,0;as*c v4 o-g,8oe T, the velocity of the two objects is the same. What is the ratio of the distance traveled in this time T by Object 2 to that traveled by Object 1?

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  12.26: An object is thrown horizontal nnj( 3 ax,:q/qxkul3lly with speed 10.0 m/s from a height H above the ground. The object reaches the ground with a speed of 20.0 m/s. Wqn u /33jak,xxql:( lnhich one of the following choices best represents the time of the object’s flight to the ground? Ignore air resistance.

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  13.10: An object is thrown straight upward. The object remains in fh dga5:f1m,ybzgdh.n4uicju.ca .b /z +/e*yree fall until it returns to its initial launch point. Which one of the following graphs could represent the velocituycni1.hyzhb/gj, * eb u:.d5 fcd. /a4m +azgy of the object as a function of time during its flight?


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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  14.03: An object is dropped into free fall. Through how many meters does th* ds *;3kdzaqnun 14lle object fall during the firs* nsnlq*4;a 3u lkd1dzt 3.00 seconds of flight?

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  15.02: A box uniformly slidejbp;3vf.jl d*ayho:-ha1+: qln - ayrs 7.50 m to rest across a flat surface in a time of :j-hpd*ynv l-ar1 la;+ h:fjoa3b.yq12.0 s. What was the initial speed of the box when it started its slide?

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  14.07: Starting from rest, a car gltiik2+4vn w )t9r9 :wugm)xcmh4a6t uniformly accelerates to a speed of 7.60 m/s in a timem x49 4tirw2)6k g mnwtgcu+ivlah:9) of 3.00 s. Through what distance does the cart move in this time?

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  14.16: A toy car initially moves c-o/rdur/1mu to the right at 60.0 cm/s. Five seconds later, the car is moving at 40.0 cm/s to the left. The total displacement of the car during this time is 10.0 cm to the left of where it started. Which one of the following choices best represents the magnitude of the average rd/m/-cu ou1rvelocity of the car during the five second motion?

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  14.17: A toy car initially moves to the right at 60.g9x4- 0avsr ob0 cm/s. Five seconds later, the car is moving at 40.0 cm/s to the left. The total displacement of the car during this time is 10.0 cm to the left of where it started. Which one of the following choices best r9gbr4-s x0 ovaepresents the magnitude of the average acceleration of the car during the five second motion?

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  14.33: An object moves with constant acbl/8z lksngr (r (7zr7celeration starting with velocity $v_0 = 5.00\;m/s$ and ending with a velocity of $v = -1.00\;m/s$ in a time of 3.00 s. For this motion, what is the average speed associated with the object?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  15.05: An object initially is moving upward while in fih2x e4 kv u+hr9,doj4ree fall. Which one of the following chr29 v,uh4 ijokhexd+ 4oices best represents the direction of the object’s acceleration during its flight?


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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  13.26: An object moving only to the right completes a 20.0 second trip inv,1cv l,v4av ;tr 34ypvecz7 p two stages, I and II. The average speed of the entire trip is 10.0 m/s. For stage I, the object moves with a constant velocity of 6.0 m/s for 12.0 seconds. What constant acceleration must the object have during the 8.0 z,4ev1 4cvr ta ylv37ppc,v;v seconds of stage II?

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  15.32: An object moving along a line completes a 20.04oubmx-lz yy838,p2 kn /nyg 1prn4jd second trip with an average speed of 10.0 m/s in two stages. During stage 1, the object mnr,8m8u xy n -djkz32lg4n1/pbo p4 yyoves with a constant velocity of 6.0 m/s to the right for 12.0 seconds. What constant magnitude acceleration directed to the left must the object have during the 8.0 seconds of stage 2?

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  13.33: At the top of a n2 q 0oogb6-bphigh cliff, a small rock is dropped from rest. A ball is launched straight downward with an initial speed of 36 m/s at a time 2.10 s after the rock was dropped. When the ball has fallen 28.0 m further than the initially dropped rock, what is the speed of the ball relative to the rogq -p2onbo60 bck?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  16.36: On a straight road, a self-drivi n9 qxm9wo28q3vigy;jvgow sz,jl t4j 0i-i*(ng car races with a robot. The robot acceleraty2gn0iixj qw9, q;(tv4 oo3w* 8mj s 9vijg-lzes at $8.50\;m/s^2$ until reaching its maximum constant speed of 15.0 m/s. The car accelerates at $5.60\;m/s^2$ until reaching its maximum constant speed of 25.0 m/s. The car and robot start from rest from the same location. What is the maximum distance that the robot leads the car during the race?

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  17.44: A ball is launct,i +uo-b dfo3hed vertically upward. The vertical position of the ball 0.70 s after release is the same as its vertical position 4.10 s aft+o , f3obu-dtier its release. At what time is the object first at a vertical position that is one-half of the maximum height it obtains during its flight?

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    总分:46分 及格:27.6分 时间:不限时
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