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习题练习:Physics Bowl by Topic 3: Kinematics - part II Uniformly Accelerated Motion

 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 res9 8y1 9o, avwl o)c0auivnpo/kt, object 1 falls freely for 4.0 seconds, and object 2 falls freely for 8.01akocy90 8w, vvpnoli9o /a )u seconds. Compared to object 1, 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 wu-ahk/3ey jo, () wgerest and uniformly accelerates to a final speed of 20.0 m/s in a time of 15.0 s. How f 3-/ue)o(gjyh ,aewwkar 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. Itq2 rxszjy +/;amhdn2( lands 6.0 s later with a velocity of 40 m/s. What was the initial velozm(2 rj2sh;yd aqnx+ /city 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 fr j+/.vrs 8f(6uanm mis accelerating vertically upward at (mffn/s ar8r+.vm6 uj$10\;m/s^2$. 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 b)go v/p5 8gtg qjdo/l3e moving downwards at 27 m/s at one instant. If it continues to fall, one d5go )glo 8j//g 3qvtpsecond 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 accele)q +mekyu)evja4 +:k6p f aze:s4h (mbrates 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 bp(g9d ;ht- gzthe top of a building strikes the ground with a speed of 30 m/s. Assume air resistance can be ignored. The height of the building is approximgdp-(gthz; 9bately:

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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 velocitv h k3l3j/6haoy 4.0 m/s in the upward direction. What is the approximate velocity of 6hvk3h jl a3/othe object one second 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 mustzta46(2 v8r d ab)xl 9ws+xok;p, ctdl 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 moving downward atg2 tsbt7*kgo-y6.tsx 18 m/s. If it continues to fall, two seconds later the object would be moving with a speed6k 7-2 tysg.bsttgx*o 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 ) im+r c, o wbvxj(/6++iur68p hmruwwis released from rest and falls freely for 4.00 s until reaching the ground. What was the height above the ground from which the object was rerv jw( ++o8bu/wc6,+6 )imwuxr pirhm leased?

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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 rigm8p ql) d2m4dses to a maximum height of 12.0 m above the launch m)qd2 p8gm 4dlpoint. Ignore 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 =0.1uyr 96n2fny- p00 kg is launched straight upward so that it rises to a maximum height of 12.0 m above the launch point. Ignore air resistance. Approximately how much time does it take the ball to reach the maximum height from its launcnr n2 y-fu9yp6h?

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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 0.4cib1, ef v4w0*up a 2dp)jlw6a0 m/s two seconds after it begins to slide. Approximately how far does ia*0e2w a1 lfpp) , b4u6iwdcjvt 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 frohh2d ku gi*2+:3/a fian;vtb9zi(po a m the top of a 100-m tower with a speed of 15 m/s. Cof 3a: 2o k;vbh+*pah9z2it (indi/au gin 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 twic6pkq:olijx;rcac( , n2..;lj 1he paye the initial speed of another, how much higher will it be at its rlxj 6pki1h;ca: lpoj; .nc2y,a .eq( 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 30 m/ )( d1azd8sr: f3qjfvdj/lgy5s. After hitting the road, it slides 45 meters to rest. How long does it taj adj3d5)f: zl/1r8fdq vs (gyke the box to come 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 velocity of 3l3 q +qbvb;uqd( 4boi;0 m/s near the surface of the earth. Aq4bbib(q 3 lq+u;vd; ofter two seconds what would be the direction 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/wtlsac2oh1 a1)tihe j0ml(/ different 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 hm2ojle/ ws0l t)t c(a/ih1a 1high to low the 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 arx*k txa:)a o bmj20 gx5(oqntbqz ;5s5e launched straight upward with identical linear momentum. Object kmqbxb s: 0 ;*o5tagzxqj)5n2ato5x( 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 ?


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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 bou 7ej56qs+/yhde5jpoce na;2gnce, 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 bouncea eqg2phn5jo /;5 s7d+ ce6eyj 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 afternt ye+7,bnck ppy06z5 launch, a projectile in free fall achieved its minimum speed during flight. If that minimum speed was 15.0 m/s, what was the projectile’s initial angc y5e70npk nz6b+ typ,le 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 l5 dzq 9em+e+azes u2(a high vertical cliff. The collision of the pebble with the ground below is seen 1.50 seconds after the pebble is d mlu5(d9azeez 2e+q +sropped. With what speed did the pebble hit the ground? Ignore 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 y sth: zvuvtri3v:,+k(b9ls c ma(j:4garage. One 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 s u:j :(vz9ktsbistar(hm vl4+cv:, y3econds, 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 straigz7 o 7khq93d 47o:qjyyqvxyn9iammn+4 ao 4i0ht 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 i qn94moki qyv90moy4a+7y7jo xa z :h4n7i3 dqnitial 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-liks15galy cduen*upow9 key i4xyv:/zq25j , )0e object is pulled downwards by gravity (down the plane of the page) but is constrained to exactly follow each of the frictionless pathways shosq4 u kjyvxy0zu5loe /gpwy )ca *: ,i5n2de19wn. 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 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 t5m)m x4.- ng*hxbmdjqower. Half a second later another rock, twice as massive as the first, is dropped. Ignoring air 4 .qmhx-)n5x*mgd bmj 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 along a track. Tz(pd3l)xuw+.8hd kg jtp7rz* he cart comes to rest after traveling 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 car tkjd p) (rh7z.3*p+x d8lguzwt 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 0bv+wmf -g3pc along a track. The cart comes to rest after traveling 1 m. The experiment is repeated on the same track, but now the0+mw p gvc3b-f 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 r aeo:n4- 4mlac;j bm7yest and runs in a straight line with a constant accelerat:m- be jcyaan44;mo l7ion 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 heighb0gh/eh5b9znj* uu;*8 ve u lot h above the ground. If the ball falls the first distance 0.5h in a time t, how much timh*hobjn/8euvgl 9zb; euu0*5e 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 p6 wr*0;t8 bw ri7 mhb;opt(euuniformly accelerate to the right. At time t=0,the objects are at the same initial position. Object 1 has initial speed twice that of r8 ;obte*p; w bhpw(i0 76urmtObject 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 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 horizontally with speed 10.05wjh4pq qmtmcxd79sx, p9l7.a r(ep- m/s from a height H above the ground. The a(px9jqs7xm7w95h ml.4 p q-tp, rcedobject reaches 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 ;v8t0 (uw;rbny f+v lrthrown straight upward. The object remains in free fall until it returns to its initial launch point. Which one of the following graphs could represent the velociu8 nfv 0r(byw+rlt;v ;ty 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 doeldp23h 3crq9di 3h rm,s the object fall during the first 3.00 seconds of flight?p923ihdrq c r33hlm,d

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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 flat surface in a timet 6j4phsa 5a(x of 12.0 s. What was the initiala x6t(s h4p5aj 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 cart *k0-foap4l*e3.v afo2 mhpkt uno:8h uniformly accelerates to a speed of 7.60 m/s in a time of 3.00 s. Through what distance does the cart move:koum*vnhlh a0fo -a4 p ot k3.fep8*2 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 to the right at 60.0 cm/s. Five seconds e,4dlq6z )j d 5 5y0ncsiow,cllater, 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 ofn5soyqdzw ec4 jd,6,l0l5ic ) 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 initially moves to the right at 60.0 cm/s. /wfwsp ,ht099 m:mc g 5lsb,juFive seconds later, the car is moving at 40.0 cm/s to the left. Thef/t9,9 scm: ,jb5pwg0lsuw mh 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 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 w1hy*vhrl )zmy6e8h;w ith 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 u)k 3 d8iskpx0sx:xw f7pward while in free fall. Which one of the follox k:is7x s0w3x8)d pkfwing choices 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 riga3pzsjec 4vi/ sl f8/8ht completes a 20.0 second trip in 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 velocityzl43a8/sci/8sep jv f 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 completenxta(o ,m6a:+;kjgb ke.te2h g in 1e-s a 20.0 second trip with an average 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 durijh-e(a6nktiat 2 x1 oek e,.b+gn:mg; ng 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 high cliff, a small xwtx(dp 00uk2xxmh* ; rock is dropped from rest. A ball is launched straight downward with an initial speed of 36 m/s at xwt*pxkm; x0d( 20xhu 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 rock?

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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-driving car races with a rob ws nl0m2 /qj;7dm*z2mvhn.u yot. The robot accelerat0m/;ud7 2z. lj mv snmn*qwh2yes 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 l yv+;k tz mp3c/:vga9upward. The vertical position 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 vertical position that is one-half of the maximum height it obt+y3tvz9l:mvgp;/ak c ains during its flight?

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