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习题练习:Physics Bowl by Topic 4: Kinematics - part III Projectile Motion



 作者: admin   总分: 23分  得分: _____________

答题人: 匿名未登录  开始时间: 24年04月06日 08:39  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  
  07.14: An object moves to the East across j 2kf+e2l-mxqa frictionless surface with constant speed. A person then applies a constant force to the North on the object. What is the resulting paqjx2+m2e -flkth that the object takes? A. A straight line path partly Eastward, partly Northward

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  07.15: Two identical mass objects are la r9j ,,wpk;:q swnt r8f. m97wjirpxv*unched with the same speed from the same starting location. Object 1 w w rp;.vxrf,9k97,r:j*q mpt8in w sjis launched at an angle of $30^{\circ}$ above the horizontal while Object 2 is launched at an angle of $60^{\circ}$ above the horizontal. Ignore air resistance and consider the flight of each object from launch until it returns to the same launch height above the ground. Which object returns to the starting height with the greatest speed?

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  07.16: Two identical mass objects are launched with the saovjf8(1(rvmxq9bk b; emx.n6me speed from the same starti r((mbe kx.jv;n 9xb8fvo1 6qmng location. Object 1 is launched at an angle of $30^{\circ}$ above the horizontal while Object 2 is launched at an angle of $60^{\circ}$ above the horizontal. Ignore air resistance and consider the flight of each object from launch until it returns to the same launch height above the ground. Which object experiences the greatest change in the linear momentum?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  94.14: An arrow is aimed horizontally, direcpswpp-ihb9 cc 3sp: +1tly at the center of a target 20 m away. The arrow hits 0.050 m below the center of the target. Neglecting air resistance, what was the initial+ppc1 sbis9wpch p:-3 speed of the arrow?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  03.05: Two arrows are launchgbu58 h2 n pd5qy-,1fsf3xt tmed at the same time with the same speed. A at an angle greater than 45 degrees, and arrow B at an angle less than 45 degrees. Both labh, tpfq2f5gs1m58-dyun3 xt nd at the same spot on the ground. Which arrow arrives first?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  95.19: A baseball is thrown horizontally from a cliff. At the y2+qg7c z7hpy same instant, a bowling ball is dropped from the same height. Assuming air resistance can be ignorz pcy+g277hq yed, which of the following statements is correct?

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  96.08: A ball is rolled off the edge of a horizontal tabk3,3fax*b yxole. The ball has an initb o3a3 *yf,xkxial speed $v_0$ and lands on the floor some distance from the base of the table. Which of the following statements concerning the fall of the ball is FALSE?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  00.36: A ball is thrown vertically upward witffc bp+)3+hw/y b;u tmh an initial velocity v and an initial kineth pbucwff) / t+bm+3;yic energy $E_k$. When the ball is half way to the top of its flight, what is its velocity and its kinetic energy respectively?

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  00.37: During a recent wintery 7*uo c(c-g (swj ;ao6n-lxxz storm, bales of hay had to be dropped from an airplane to a herd of cattle below. Assume the airplane flew u- -l j(xoaxygn ;c76cw( *sozhorizontally at an altitude of 180 m with a constant velocity of 50 m/s and dropped one bail of hay every two seconds. It is reasonable to assume that air resistance will be negligible for this situation. As the bales are falling through the air, what will happen to their distance of separation?

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  00.38: During a recent winter storm, bales of hay had to be dropped /fh.s 9ra-tns 2hu7su from an airplane to a herd of cattle below. Assume the airplane flew horizontally at an altitude of 180 m with a constant velocity of 50 m/s and dropped one bail of hay every two seconds. It is reasonable to assume that air resistance will be negligible for this situation. About how far apart from each other will ts u-7tfah.9/nss u h2rhe bales land on the ground?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  01.14: A football is kicked a distance of 5cyu8 c) joq*gn3n w6l/0 yards down field. Neglecting air resistance, which of the following statements would be INCORRECT when the foo86*nqlyg/ow3 ju)ncc tball reaches its highest point.

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  03.10: A ball is thrown into the air at an angl w7.me,sme:dmf;kw/ 0qu4njn e $\theta$ as measured from the horizontal with a velocity $v$. The horizontal velocity of the ball will be directly proportional to which of the following

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  05.35: An arrow is shot horizontally towardhv 5wrv zt7s r *z;p7z7rg3*ld a target 20 m away. In traveling first 5m horizontally, the arrow falls v*rt;7zv 5wrs zrd37hg *7zpl0.2 m. In traveling the next 5 m horizontally it will fall a additional

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  06.04: An arrow is shot from a bow-zr ms*tz 9kdm12nfc( at an angle of $40^{\circ}$ from the horizontal at a speed of 24.0 m/s. Ignoring air resistance, what is the arrow’s maximum height above its launch point?

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  09.20: A projectile launched from the ground landed a horizdw0h9qj f1j lq.c9 ju7ontal distance of 120.0 m from its launch point. The projectile was in the air for a time of 4.00 seconds. If the projectile landed at the same vertical position from which it was launched, what was the launq9 qu17lcf0jh. j9dwjch speed of the projectile? Ignore air resistance.

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  13.14: A small ball is throwi )cumi oa 19+dr0e5lin at an angle of $30.0^{\circ}$ above the horizontal ground with a speed of 20 m/s. To what maximum height above the launch point does the ball rise during its motion? Ignore air resistance.

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17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  13.43: A small 1.0kg mass is launched from the top of a cli.*lty9ivc,vw) tz i7gff with speed $V$ at an angle of $30.0^{\circ}$ above the horizontal. When it reaches the ground, its velocity is directed at $45.0^{\circ}$ below the horizontal. Which one of the following choices is the magnitude of the total impulse that was imparted to the mass during its flight? Ignore air resistance.

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18#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  09.09: The free fall trajectory of an object thrown horizontallyve-3-8x u 0 )onqaepxi from the top of a building is shown as the dashed line in the figure. W ap)n-0q xeixv-ou38e hich sets of arrows best correspond to the directions of the velocity and of the acceleration for the object at the point labeled P on the trajectory?


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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  02.41: A person throws a small object from the tic4 u-j zhzf+8v(i:vr op of a building at an angle of ivvz8rjuh:z 4 f(-+c i$30^{\circ}$ above the horizontal. At the instant that the object returns to the same height from which it was thrown, at what rate is the speed of the object changing? Ignore air resistance and let g be the acceleration due to gravity.

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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  15.21: An object is l-lkbxqs0n8r )aunched from the ground at an angle of $60^{\circ}$ above the horizontal with a speed of 20.0 m/s. What is the magnitude of the average velocity of the object from just after launch until it reaches its highest vertical position during flight?

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  16.41: A small object is launched 30° above the horizontal from a height eg464bvpkt ju+e8(cs/r2ivo of 10.0 above the ground. If the initial speed of the object is 15.0 m/s, at what angle below the horizontal is t+tcj /(rks4 pvu b6eieo48 2vghe object moving when it reaches the ground? Ignore air resistance.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  17.32: A projectile is launched at an angle ofyx3vs8 e0:4o-m7i lpyo6xv/mq uw 3ak 40° above the horizontal with a speed of 30 m/s . How much time passes before the position of the projectile makes an angle of 20° above the 3vuv80-mx wmy6xia p4klyeo/:7oq s3horizontal from the original launch point?

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  14.40: A small 1.35-gram mass is launched f h k17*q2t;dur:zf s2 gyhcdu0rom the top of a cliff at an angle of t qguk d02s ;d7hyr:*fchu z21$15.9^{\circ}$ above the horizontal. When the mass reaches the ground 4.33 seconds later, its velocity is directed at $34.4^{\circ}$ below the horizontal. What is the speed of the mass when it reaches the ground? (ignore air resistance)


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