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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 object y y5 eis03jq/j/6(u2naeoooc 2 falls freely for 8.0 seconds. Compared to objeyc joa q os/e0u6(3ei5nyo/j2 ct 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 rest and uniformly accelerates to a finahyu2x3kavf +3/y2d x kl speed of 20.0 m/s in a time of 15.0 s. How far doex3d +y2uy/3xvkfa2 khs 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 wy8mn6 ps2+ chxith no horizontal velocity. It lands 6.0 s later with a velocity of 40 ymxhcp826+s n 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 sehgai98 e5ji4 urface of the earth is accelerating vertically upward j8ee4iaig 59hat $10\;m/s^2$. 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 down iocp/-f,e5mv wards at 27 m/s at one instant. If it continues to fall, one second later the object wp-m5 / eivf,coould 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 accelerates at .o 4bt yaxdmv 28og ,ie/y49sc$0.80\;m/s^2$ 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 sti (vvjx0paqh-8 /mp9(pa:b o;s k3r4z8heiaxrikes the ground with a 8o((z b kpmhphpvqi8x;/a0aei9j a:sr4 3-v xspeed 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 object in free fall has velocity 4.0 m/s skjly 4cf)r(r ; 30wnnin the upward 4( j0kr rys3 l;nnw)fcdirection. What is the approximate velocity of the 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 must aiqxi:ty4()x3) qm,g*p m ed wy $2.5\;m/s^2$ 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 foun; +4myb84 ltf p .,b5sl tfzzc(yq5hted to be moving downward at 18 m/s. If it continues to fall, hmbc;s4e8 yqf ytf5t +lz.(5ztp, b4ltwo 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 and falls freelyk h5 .pt rt5;o s5n5d(tkjp;qr for 4.00 s until reaching the ground. What was the height above t5;orh pst(5 5rd5njk .qtpk; 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 th0so.44h4d hc ;gabhrt7six mdxp1 xtqs92)3tat it rises to a maximum height of 12.0 m above the launch point. Ignore air resistance. When the ball reaches its maximum height, which one of the following choices best represents the magnitude of the net0;) h4 . t9gr4t7s tidqx 3xmhpshbas1 dcx24o 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 laun;0ldo 9zb )oo*jo:edm8j4e n mched straight upward so that it rises to a maximum height of 12.0 m above the launce*8ejb;oloo)j9o:m 4m z dn0dh 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 anel-3y;g*w xaf9 p8r/d srqn3g inclined plane has speed 0.40 m/s two seconds after it begins to slide. Approximately fpy e 9wng d3arg-xl38q; r/*show 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 tower with a sh ;tho /b18lbkpeed of 15 m/s. Coin II is dropped (zero initial speed) from the top of the tower 2.0 s latbh8;1/o bk hlter. 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 twice the initial speedov( .ob sl8fc( *-cund of another, how much higher will it be at (-n*vlds ou f(bcc.8oits 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 trl1mmqiq6 ddl2v ibx20ugmn n . (1vs,;s)m, truck traveling at 30 m/s. After hitting the road, it slides 45 meters to rest. How long does it take the box to come to reqnmtmr16sql02)us ,,vm ng .dxl;mdb 2vii1( st?

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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 30 m/s near the surfacvw6y r/kn4q-zu bmzq3lo20 e,fr(s/pe of the earth. After two seconds what would be the direction of the displacement, vnzlr4e2 3 6/u0 zbmwfk(sy pr- /q,vqoelocity 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 dae(u(tt,m w 1jifferent 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 the maximum height of eac((am 1,wtuejth 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 obje2y29fkl 8zgdjuth;) wcts are launched straight 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 attained height above the launch point in terms of H j)wt2d 2lf;u9 yzh8k g?


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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 thenj :cx; fv.y 3)qmte-g ground as shown. After each bounce, the ball reaches one-half the height of th:.qfne-3yv cj) ;xmgte 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, a8x8a nmw7.fg.ca*ld c 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 angle of launch f*ccg.8daw. mx8al n7from 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 collus o6clg5h. fn(;u g;sision of the pebble wisc ;5( h.uunfo6lg;g sth 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.

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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 arguinb ;:ci(o.( m6srva ks f dwwrq957)jtcg about 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 the 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 tf95(a.swit7 o bcr ( skwd;c6)mj :qvrhe 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 s84 0hw:dnbt axtraight 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, respebn :at4 xwdh08ctively, 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 object *1a qkn5/pyky)e3c(a5 acoqhis 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 longesaqe c5n/yky q3ck1*a(ph 5o)a t 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 anoth 4x4cdaxsc)(l*vw2j ker rock, twice as massive as the first, i4 sx c)(4d ajvkwcx*l2s 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 alon9hg6 1jhn gw9ce gwl,2g a track. The cart comes to rest after traveling 1 m. The experiment is repeated on the same trahwg6 lh192wjce 9g,gnck, 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 mo )dhdz ljtw x/c5,q*4fving at 0.5 m/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 moving at 1 m/s. How far does the cawh/ fzqd,j * )4dltx5crt 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 st.-*uac 1 exxxrug37yzraight line with a constant acceleration of 2xa7 u-1x *.ur3cy egxz$.5\;m/s^2$. 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 heighc1plh:dyf6x 8 kl5 z1dbct+7mt h above the ground. If the ball fbm1dk1y hl8cf7xz6c+ d:l5tpalls the first distance 0.5h in a 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 accelebkul1. *d/q myrate to the right. At time t=0,the objects are at the same initial position. Object 1 has initial speed twice that of Olym/udk *1bq .bject 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 10.0n f9 *1pfi,gi9n;y jjy m/s from a height H above the ground. The object reaches the ground with a sn *ij9gy9fny;j1 i f,ppeed 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 straight upward. Thed;hn 9h.6otb+s 7nqnkvkk3 *k object remains in free fall until it returns to its initial launch point. Which one of the following graphs could represent the velocity of the object as a function othdknn76*k .onbhkkv qs9 3+ ;f 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 droppc)-z-qlxc t9-u 9vyejed into free fall. Through how many meters does the object fall during the firlyxj qc--9tu- )9ce zvst 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 slides 7.50 m to rest across ;uv:+ mrq a*kca flat surface in a time of 12.0 s. What was the initial speed of the box when it started its:ucmq v k+;ar* 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 uniformly.bk lcq-x5j -g accelerates to a speed of 7.60 m/s in a time of 3.00 sc gbl xqk-5j.-. 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 to the rightq fk*6 rbxlj22j biiew,h)27r at 60.0 cm/s. Five seconds later, the car is moving at 40.0 cm/s to the left. The total displacement of th 7i ,2r wh2bx*bfr) ej2iqlkj6e 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 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. Five owljknnnz -0,f9q s7)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 mazo,)nw n-0f7 jnq9kls gnitude 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 acceleration s0 mijyg i4q.oohn:(9e/ q *ysvtarting 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 oy81o lxet6p) zne of the following choices best represents the direction of the object’s a 1t8l yzxoe6p)cceleration 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 injik3i6; cwzir6d17p5i,pwzi 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 durincrii; pw3p 5iz ijzw7k1di,66g 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 seco502olkkd go ,jnd trip with an average speed of 10.0 m/s in two stages. During stage 1, the object moves with a constangjd5 lo2,kk0o t 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 high cliff, a small rock is dropped from rest. A bze, uu15d:mnaj: p2 nball is launched straight downward with an initial speed of 36 m/s at,ud1e 2a:ub mpn5zn :j 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 care wpg lw6 yqu4-ba 89b2s-7ckt races with a robot. The robot acceleratkycgw 9l-7w8bpes 4tq b -u62aes 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 posdbsme//im;8 tfe6 ;kiition 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;d e/ st mbmek/;86ifi of the maximum height it obtains during its flight?

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