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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, object4at pe6sy4db o; ,8*ysq1hyc q 1 falls freely for 4.0 seconds, and object 2 falls freely for 8.0 seconds. Compared to object 1, ;8obe*a4 ,4yq pshtdq6y1 yc sobject 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 uniforml czbb;)4pislzu30v h) q.w 3oay accelerates to a final speed of 20.0 m/s in a time of 15w)zlzah)b cqi. v3ob4s p;30 u.0 s. How far does the car travel during this 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. It wp l:wk,jvaspo+ 5 *w)lands 6.0 s later with a jw:w)5paw l *pk,+sov velocity of 40 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 vert5kjkm3(yjxflg 4sa+1t/buu 5ically upward 5/4x b(s1kuu+ fyt gjk5alm3jat $10\;m/s^2$. 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 moving da /hu2eg:ckwi2nz s 67tww h-qv: a+3rownwards at 27 m/s at one instant. If it continues tk en:w2whaq6+ utgzs/ai-hc:v r 327wo fall, one second 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 from rest and a)iro i3mkpgx80q+21i l;bvph ccelerates 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 is dropped from the top of a building strikes t 6+kefcy:h.5piav /)0w7gyonqiamt5he ground withog hi)k/y av i6.awf+:5enyct50p 7qm a speed of 30 m/s. Assume air resistance can be ignored. The height of the 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 objf7b6r ktw.2c qxm:i9 yect in free fall has velocity 4.0 m/s in the upward direction. What is the approximate velocity of the object one second l 76t.rqby:cwx2i9 fkmater?

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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(euz i3ki w,wo9/ ,4xotxs,fg a $2.5\;m/s^2$ 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 is found to be h-+2k w if-lkx /+trjomoving downward at 18 m/s. If it continues to fall, two seconds later the object would be moving with a speftro/++kw kj2-i h-x led 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 and falls mk ;q6f/2me kv/sy *3ngtf*v rfreely for 4.00 s until reaching thev ye/f v f2/smg;r *kn*kq36mt ground. 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 =0.100 kg is launched straight upward so that it rises tyiq 5n *f)7gjx,. yk:j)uiq;empp6y q o a maximum height of 12.0 m above the launch point. Ignore air resistance. When the ball reaches its maximum height, whip7 ny y.u 65e)jmgxqk,)yq if; *ij:pqch 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 =0.100 kg is launched straight upward so that 3.jdn2jj2 fil ;..0tdms cm nsit rises to a maximum height of 12.0 m above the launch point. Ignore air resistance. Appsi02.jt 3.md;lf2. nnsdcjj mroximately 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 has speed 0.40 mzo 7u*uv rgj)2v;ji+ u/s two seconds after it begins to slide. Approximately how far do7zj+u*r2uu;oi) j vgves 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 tower/u ea.nliw; h4 with a speed of 15 m/s. Coeia .u4/ lh;nwin II is dropped (zero initial speed) from the top of the tower 2.0 s later. 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 with sy /d -hucvl 6f ez6926ouwv0vtwice the initial speed of another, how much highes6w-lv0o u c2y/fvv9eh 6ud6z r 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 a delivery truck traveling at 3or 0,cp-qcw)5 k 7rozn0 m/s. After hitting the road, it slides 45 meters to rest. How long does it take the box to cocrko5-7nqwc p)o zr0 ,me 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 upwards with a velottf 2l 2h9cio9city of 30 m/s near the surface of the earth. After two seconds what would be the direction of the displht ic29olf2 9tacement, 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 different mass (1m, 2m& 3m) are throgz60 m16(s d qlxqysn.wn vertically upward with different velocities (1v, 2v& 3v respectively). The diagram indicates the mass and velocity of each stone. Rank from high to low the maxs q0y(mq.1sz d6 xnl6gimum 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 straight upward with identical linearke9)(z eb/zww jg7ot4o30tq u6 l.sch 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 attained height above the launch point in terms of H ?kcol)e g936z ezuwt7/w t0boh(4.sqj


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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 each bounj cv0n1:ljry0;7nk ctce, the ball reachrt7cj1 kcv 0j0y nnl;:es 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 between 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 launch, a projectile in free fall achieved its minimui.6f g vkyvokju-x9 qb2y7;f5m speed during flight. If that minimum speed was 15.0 m/s, what was the projectile’s initial angle of launch from the hor6y5 k ovb.vj2k xyigquf; -7f9izontal?

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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 dro2oadu6/dp.e p pped from a high vertical cliff. The collision of the pebble with the ground below is seen 1.50 seconds after the pebble is dropped. With what speed did the pebble hit the ground? Ignore air resistance. ae6odu/pdp.2

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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 adh,j..sn 8bjbbout the height of a parking garage. One student suggested that to determine the height of the garage, they simply had to drop tennis balls from thj,jn8.d .bb hse top and time the fall of the tennis balls. If the time for the ball to fall was 1.4 seconds, 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 a7lo)(ugjtxg caq(vd ; ly1622rtt2 hx long a straight line. Its initial position is x0 = -5 meters and it is moving away from the origin and slowing down. In this coordinate system, the signs of the initial position, initial velocity and acceleration, respectively, a2t(oxv2uxl6g7 lh g(c 2;qtay t) 1rjdre

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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 object is pulled downwtmx2r(y/ ln,- +qzhqrards by gravity (down the plane of the page) but is constrained to exactly follow each of the frictionless pathways shown. R r+nl 2qqh,(zmyrtx-/ank 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 changing 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 later anot/ bz 3nq ya;td6spa4a mgt8n71her rock, twice as massive as the first, is dropped. Ignoring air resistt7n8n;bys4 adtqzp3m1 6/ gaaance,

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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 n pa(46sw 1ukjm/s along a track. The cart comes to rest after traveling 1 m. The experiment is repeated on the same track, but now the cart is initially mosawnk (u146jp ving 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. The cart com82eep y/byu5res to rest after traveling 1 m.yr uep28b 5/ye 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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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 straight linelgdk 5ypi;gs/rk1- c)9nm9qv with a constant acceleratio cd 9m qry)/gkvn5p;i9-g 1lksn 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 ab) jvi5mju71vb 9sjw. jove the ground. If the ball falls the first distance 0.5h in a time t, how much time is rv).jb5j sjvi1u9mjw7 equired 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 acp/ef gb y::1uzcelerate 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 time T, the velocity of the two objects is the same. What is the ratio of the distance traveled in this timef u1/ zepybg:: 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 horizontally with6 zh wy7-h5jcc speed 10.0 m/s from a height H above the ground. The object reaches-6jz 5cyh c7hw the ground with a speed of 20.0 m/s. Which 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 straightyvx3nrs g kai4m13 l-4 upward. The object remains in free fall until it returns to its initiali- xnkl 13 ras3m4vyg4 launch point. Which one of the following graphs could represent the velocity 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 *5zchxwjy8(f o.qvr; free fall. Through how many meters does the object fall during the first 3.00 seconds of f8*f w5;qho(xv zcyj.rlight?

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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 slides 7.50 m to rest across a 9ysski d1rp42 flat surface in a time of 12.0 s.pr ds2kiy19s4 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 crfs wody l( ui 01l5nq nvq(+ae4 9npzb98by38art uniformly accelerates to a speed of 7.60 m/s in a time 94bopl qn8avy n(+rd5ul 9 z1 wfsq0 y8n3e(biof 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(.z-kkhimks) yyu6t.m p /)tij.2gqs 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 -.). mpms)/ 6iz ujh .kskqkity2 ytg(to the left of where it started. Which one of the following choices best represents the magnitude of the average velocity 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 inidm 0l uv3wor49tially moves 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 tim9rl3u0 v owm4de is 10.0 cm to the left of where it started. Which one of the following choices best represents 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 wit ags:n yyq lvuz;9+.a2h constant acceleration 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 free fall. Which onmt +m toneil2 50/f/xwe of the following choices best represents the direction of the object’s acceleration during its flight?2/tit of +w50nemmx/l


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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 seconvwb6l3 rxsjboaj ;-j enqi,u.4 6-4f yd trip in two stages, I and II. The aviwy,qsbne u6f -6 v-j4br oj3 x4aj;l.erage 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 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 20.0 second trip with an av,6ts :lwl6pi:d zx5,-ankwmderage speed of 10.0 m/s in two stages. During stage 1, the object moves 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 l6dplws-, 5m,:dtax izn6: kw.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 high cliff, a small rock is dropped from rest. )1nsba (bo6 - ikplal)A ball is launched straight downward with an initial speed of 36 m/s at a time 2.lb6bo skalpn))(i1-a10 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 rock?

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单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  16.36: On a straight road, a self-driving car races with a robot. The robote:jl(0ozi xbya) df*/ accelerate*jozy/e: f )(ab dix0ls 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 launched vertically upward. The vertical posirr w3ub9av)q0 tion of the ball 0.70 s after release is the same as its vertical position 4.10 s after its release. At what time is the object first at a vertical3) wbr 9rqv0ua position that is one-half of the maximum height it obtains during its flight?

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