51fly国际课程 (51fly.win)

 找回密码
 立即注册

手机扫一扫,访问本页面

 

      

上传图片附件

未使用图片

小贴士: 允许的图片文件格式为: gif, jpg, jpeg, png, webp,上传完成后会在上方生成预览,用鼠标连续双击缩略图,或拖动缩略图,该图片就被绑定至本题,显示在题目下方

本次作答已使用

小贴士: 此栏目显示的是当前作答使用的所有图片,绑定到某一题目的图片同时会显示在该题目下方; 删除使用的图片会将其转移到<未使用图片>类别


习题练习:Physics Unit3: Kiematics Motion in Two Dimension & Vectors

 作者: physics   总分: 66分  得分: _____________

答题人: 游客未登录  开始时间: 22年07月20日 00:48  切换到: 整卷模式

标记此题
1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which one of the followinoypilmh (l; ht2 ;h:d3g is an example of a vector quantity?

参考答案:    

标记此题
2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following operations will not change a v- pl8d f1sgoj;ector?

参考答案:    

标记此题
3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following is an acc3tx1 5trbv k62java2g urate statement?

参考答案:    

标记此题
4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The resultant of two vectors is the smallest wa-* -hvsptt(bhen the angle between them is

参考答案:    

标记此题
5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two displacement vectors have magnitudes of 5.0 m a8x0se,p ovbelet5 t;7nd 7.0 m, respectively. When these two vectors are added, the magnitude stx7v ,o;80e tbep5el of the sum

参考答案:    

标记此题
6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two vectors, of magni;/uq0q/w c;cded6c gytudes 20 and 50, are added. Which one of the following is a possible answer for thedce; d;ucwqy/cq 06/ g magnitude of the resultant?

参考答案:    

标记此题
7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Three forces, each having a magnitude of 3 7u4q47fendp7r 2e+zr tul938 yygr; * uupgvi0 N, pull on an object in directions thavz2y34eu i +;upgr7*lpgernu4qr 78td u9 7yft are $120^{\circ}$ apart from each other. Make a statement concerning the resultant force.

参考答案:    

标记此题
8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In the diagram shown, the unknown vector i8y55e8duy cfr(i ; gphs


本题所包含的其它图片:

参考答案:    

标记此题
9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Ignoring air resistance,6wly6o*;df8/ wfye/ms iu,p d the horizontal component of a projectile's velocity

参考答案:    

标记此题
10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ball is thrown with a velocity of 20 m/s at -k3i5i goa i0oan angle of 60e above the horizontal. 5 0 iio3o-kgaiWhat is the horizontal component of its instantaneous velocity at the exact top of its trajectory?

参考答案:    

标记此题
11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Ignoring air resistance, the hori q,m1 . b8swbn zbq-r4l+eojw/zontal component of a projectile's acceleration+-1j/mbzeqw so.,lb q4bw8nr

参考答案:    

标记此题
12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A soccer ball is kicked with a ver*rq3xr2qg zje2.q j(ha9(9g 5ppub llocity of 25 m/s at an angle of $45^{\circ}$ above the horizontal. What is the vertical component of its acceleration as it travels along its trajectory?

参考答案:    

标记此题
13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the acceleration vector ofq*lo)mo+o o0s/r 3gwv4zo l u, an object is directed anti-parallel to the velocity ve,4s)*l/ zw0m vqlro+ o3oguooctor,

参考答案:    

标记此题
14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the acceleration of an object is always directed perpendicular t ypypx9:27 wcio its velocity,p2wy x9:p7yci

参考答案:    

标记此题
15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what angle should a water-gun*fpdka4m1 44 -yxvqnt be aimed in order for the water to land with the grea 4*4f xvd kn1ypaq-m4ttest horizontal range?

参考答案:    

标记此题
16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An Olympic athlete throws a javofeerga9m7t, 3 -osuou co/-4elin at four different angles above the horizontal, each with the sa--oo oou3esmt/,guafe4 79crme speed: $30^{\circ}$, $40^{\circ}$, $60^{\circ}$, and $80^{\circ}$. Which two throws cause the traveling to land the same distance away?

参考答案:    

标记此题
17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are throwing a ball for the second time. If the ball lep2yg8s4 )pz6 -ngan rgaves your hand with twice the velocity it had on your first throw, its horizonta p-yzrp6ag8gn)24 nsgl range R (compared to your first serve) would be

参考答案:    

标记此题
18#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ball is thrown at an orig , b 9u i3l:m(iarn)4ovea:gx6g gv4sxinal speed of 8.0 m/s at an angle of $35^{\circ}$ above the horizontal. What is the speed of the ball when it returns to the same horizontal level?

参考答案:    

标记此题
19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  When a football in a field goal attempt reaches its maximum height, how does 8 u 0gx1)pmy0ojv)cbe its speed compare to its imgx0puec)bj8 y0)1 ovnitial speed?

参考答案:    

标记此题
20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A stone is thrown horizontally p65u ,kt)j9oqs fqwu7 from the top of a tower at the same instant a ball is dropped vertic s,7ququ 9fj56k)tpwo ally. Which object is traveling faster when it hits the level ground below?

参考答案:    

标记此题
21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bullet is fired horizontally, and at the same instant a second bullet is drh2mt nr )9tjs9opped from the same height. I2)thsrm9j9n t gnore air resistance. Compare the times of fall of the two bullets.

参考答案:    

标记此题
22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A plane flying horizontally at a speed of 50.0 m/s and at an elevation of 16o t4wfs-m8irkb6l) b.l)y h1z0 m drops a package. Two secony) -fotib4km.lzhrb8l6 )w1s ds later it drops a second package. How far apart will the two packages land on the ground?

参考答案:    

标记此题
23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A package of supplies is dropped from a plane, a;d.2 pw 586awrl:z szarq g,avnd one second later a second package is dropped. Neglecting air resistance, the distance between the fala:rw5vw ,p6sgd rq8a. 2l;zzaling packages will

参考答案:    

标记此题
24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pilot drops a bomb from a plane flying hnpfv8qn; x 04+ad c ilt;f1cs5orizontally at a constant speed. Neglecting qfac+c; 1t5xvl0ni 4 fp8dn;s air resistance, when the bomb hits the ground the horizontal location of the plane will

参考答案:    

标记此题
25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The acceleration of gravity lz ;2e1-9vo 9 qtqoacron the Moon is only one-sixth of that on Earth. If you hit a baseball on the Moon with the same effort (e qr2 va;-9qzclt19ooand at the speed and angle) that you would on Earth, the ball would land

参考答案:    

标记此题
26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are traveling at 55 mi/h in the +x axis relative to a straigg6qj 2+s , rj6un/cnr/blpekd 3xm mu-4)yuj(ht, level road and pass a car traveli+k6g/nucj mle /yp,2us -4jrum)b6(rxj 3nqdng at 45 mi/h. The relative velocity of your car to the other car is

参考答案:    

标记此题
27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are trying to cross a river that flows due south with a s(jx j.cyv 1hgo 6s+t)ktrong current. You start out in your motorboat on the east bank desiring to reach the west bank directly west from your starting point. You sy xjv1hs j gt(+)6.ockhould head your motorboat

参考答案:    

标记此题
28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Your motorboat can move at 30 km/h in still water. How much tif i5.m.b4wk *gkr 4pn m1ghdt3oa6)itme will it take you to m4ii 6kab1ngwrt5k.mdh topm gf.4 *)3 ove 12 km downstream, in a river flowing at 6.0 km/h?

参考答案:    

标记此题
29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Vector A has magnitude 8.0 m at an angle of 30 degrecso u05b,rx r:es below the +x axis. The y component o cxu,50orrs:b f A is

参考答案:    

标记此题
30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a ball is thrown with0*rq0whv8n;n6d ) 5i6 vdlgivv r fy8q a velocity of 25 m/s at an angle of $37^{\circ}$ above the horizontal, what is the vertical component of the velocity?

参考答案:    

标记此题
31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If you walk 6.0 km in a straight line in a direction north ofi-pp gf:6odz b .la6f1 east and you end up 2.0 km north and several kilometers east. How m:pdo6 zpiga16bl f f-.any degrees north of east have you walked?

参考答案:    

标记此题
32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A butterfly moves with a speed of 12.0 m/s. The*rof6;g 3prox x component of its velocity is 8.00 m/s. The angle between the direction of its motion and the rpf oo3x;gr*6 x axis must be

参考答案:    

标记此题
33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 400-m tall tower casts a 600-m lo;a,zp btxn+,kng shadow over a level ground. At what anglezbkp,a;tx+ ,n is the Sun elevated above the horizon?

参考答案:    

标记此题
34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two vectors A and B have components (0, 1) and (-1, 3), respectively. What;qkdcg,wo/(+x zy,e( y y,gl u are the components of the sum of these (uy,,d,gexl y ckqzoy(w/ ;g +two vectors?

参考答案:    

标记此题
35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two vectors A and B have components (0, 1) anf 3a0y*qbhmtl3ou ct n,d2pm 2y;4ff )d (-1, 3), respectively. What is magnitude of the sum of these two vectors?myqpd;f 2n t *4tf323y0lhcmou)b,f a

参考答案:    

标记此题
36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Vector A = (1, 3). Vector B = (3, 0). 3cpn6gmuk 47s Vector C = A + B . What is the magnitud7 gnpkmucs63 4e of C ?

参考答案:    

标记此题
37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car travels 20 km West, then 20 km South. What is the magnitude of its d)e.j5wez8 wq-u1 serrisplacement?) ewe.urrq8-j w 5se1z

参考答案:    

标记此题
38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Three vectors, expressed in Ca a:*g litw/,y3a0 qpaartesian coordinates, are
S = (-3.5,+4.5)
T = (0,-6.5)
U = (+5.5,-2.5)
What is the magnitude of the resultant vector S + T + U ?

参考答案:    

标记此题
39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Three vectors, expressed in zg7*l)q6i rqvCartesian coordinates, are
S = (-3.5,+4.5)
T = (0,-6.5)
U = (+5.5,-2.5)
What is the angle of the resultant vector S + T + U measured from the positive x axis?

参考答案:    

标记此题
40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If vector A = (-3.0, -4.0) and vector B = (+3.0, -8.0), what is thrvp o8vm1r4 b;u1kdr5w 7x; okc2g8nrz :ni;xe magnitude ofi 1 xdo8krvm b5knz cr;7rp4: ;u18gwx2vnro; vector C = A - B ?

参考答案:    

标记此题
41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A runner runs halfway around a circular path of radius 10 m. What is th, vg6ie pz-peb0 otl;1o60vsve displacement of the jogp0,gtb1o li; eo 6s6ezv0-vvp ger?

参考答案:    

标记此题
42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two forces are acting on an object as shown in Fig. 3-1. What is the maa sur* dg;i p/lef0t84gnitude of the resultdt 4arg8 fs0p/;ilue*ant force?


本题所包含的其它图片:

参考答案:    

标记此题
43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two forces are acting on an :b)mylaijj4 jy:4c h4object as shown in Fig. 3-1. What is the direction of the resultant fjc4jb a4yy:ijhm4: l)orce?


本题所包含的其它图片:

参考答案:    

标记此题
44#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
Vector A is 5.5 cm long and points along the b1rilde+a 9r *o zm;;qx axis. Vector B is 7.5 cm long and points at +30e tbr*q9iz1m oe+ ra;ld;o the negative x axis.
(a) Determine the x and y components of Vector A .
(b) Determine the x and y components of Vector B.
(c) Determine the sum of these two vectors in terms of components.
(d) Determine the sum of these two vectors in terms of magnitude and direction.
参考答案:    

标记此题
45#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
Vector A is 75.0 cm long and poin7 ya4k klrjjgy()4(vjoqd .2zts at $30^{\circ}$ above the positive x axis. Vector B is 25.0 cm long
and points along the negative x axis. Vector C is 40.0 cm long and points at $45^{\circ}$ below the negative x axis.
(a) Determine the x and y components of Vector A .
(b) Determine the x and y components of Vector B .
(c) Determine the x and y components of Vector C .
(d) Determine the sum of these three vectors in terms of components.
(e) Determine the sum of these three vectors in terms of magnitude and direction.
参考答案:    

标记此题
46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A stone is thrown horizontally with an initial speedz*2i ds:jl n ,yj1,ddk/ hi6uyn+g8hp of 10 m/s from the edge of a cliff. A stop watch measures68zdn y hlnd/+g, kjsuhp,y* di1:2ji the stone's trajectory time from the top of the cliff to the bottom to be 4.3 s. What is the height of the cliff?

参考答案:    

标记此题
47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A girl throws a rock horizontallyls,ch *+fvpf;:sw yc2, with a velocity of 10 m/s, from a bridge. It 2 swp*+ch:, vflfscy;falls 20 m to the water below. How far does the rock travel horizontally before striking the water?

参考答案:    

标记此题
48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ball thrown horizontally from a point 24 m above the khzk x o:uf3oa/-:l,f ground, strikes the ground after traveling horizontally a distance of 18 m. With what speed was of/zu:, faoxlkhk :3-it thrown?

参考答案:    

标记此题
49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A jumper in the long-jump 6p:w.+x q,0jkck 2zvgh0m fidgoes into the jump with a speed of 12 m/s at an angle of2.q f6d,0k cz 0:xgm+v ikhpwj $20^{\circ}$ above the horizontal. How long is the jumper in the air before returning to the Earth?

参考答案:    

标记此题
50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A jumper in the long-jump goes into the jump with a speed of 12 m/s at an angle ,/rsp0r hhy zx; 7ppo;of hp;;yrxh /os70z,pp r$20^{\circ}$ above the horizontal. How far does the jumper jump?

参考答案:    

标记此题
51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A projectile is launched with an initial velocity of 60.0 m/s a;lj1ox8ql0 n8w)/ af:hse loat an angle of $30.0^{\circ}$ above the horizontal. How far does it travel?

参考答案:    

标记此题
52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A projectile is launched witmf 64)khu: brgh an initial velocity of 60.0 m/s at an angle of $30.0^{\circ}$ above the horizontal. What is the maximum height reached by the projectile?

参考答案:    

标记此题
53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A rifle bullet is fired at an anloa8ja4)np4* ijoq6 ll8zsw:h a8 bc7 gle of $30^{\circ}$ below the horizontal with an initial velocity of 800 m/s from the top of a cliff 80 m high. How far from the base of the cliff does it strike the level ground below?

参考答案:    

标记此题
54#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
A projectile is shot* ublmx9 ,hn;l horizontally at 23.4 m/s from the roof of a building 55.0 m tall.ll* n 9bhxmu;,
(a) Determine the time necessary for the projectile to reach the ground below.
(b) Determine the distance from the base of the building that the projectile lands.
(c) Determine the horizontal and vertical components of the velocity just before the projectile reaches the ground.
参考答案:    

标记此题
55#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
A projectile is firedwx7 d9v,t qd2uu5 cs,s from ground level with an initial speed of 55.6 m/s at an angle t9,q swc2dus5 x7ud v,of $41.2^{\circ}$ above the horizontal.
(a) Determine the time necessary for the projectile to reach its maximum height.
(b) Determine the maximum height reached by the projectile.
(c) Determine the horizontal and vertical components of the velocity vector at the maximum height.
(d) Determine the horizontal and vertical components of the acceleration vector at the maximum height.
参考答案:    

标记此题
56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  On a calm day (no wind), you can run b * situ2e.of.nvq,*qa 1500-m race at a velocity of 4.0 m/s. If you ran th.q,seo*.nv2*b i ufqte same race on a day when you had a constant headwind which slows your speed by 2.0 m/s, the time it would take you to finish would be

参考答案:    

标记此题
57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A plane has an air speed of 200 m/s due North, and isezygn nxfk5. o(o1 hv+a;qg ;9 in a wind of 50.0 m/s to the West. The plane's speed rela.eqnx;ay;g9 v5k 1h go+(nozftive to the ground is

参考答案:    

标记此题
58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A plane is flying due Swo pkjzz:)c )1outh ($270^{\circ}$) at 500 km/h. A wind blows from East to West ($180^{\circ}$) at 45.0 km/h. Find the plane's velocity with respect to the ground.

参考答案:    

标记此题
59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a speed of 120 km/qqo n- qz 5ft0rh i,-ekm368fxh is headed $30.0^{\circ}$ east of north in a wind blowing due west at 30.0 km/h. What is the speed of the plane relative to the ground?

参考答案:    

标记此题
60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A fighter plane moving+sg -pfv8 qugfjt61+i 200 m/s horizontally fires a projectile with speed 50.0 m/s in a forward directi1uq6v fgit gj+s+8 -pfon $30.0^{\circ}$ below the horizontal. What is the speed of the projectile with respect to a stationary observer on the ground?

参考答案:    

标记此题
61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A boat, whose speed in still water is 8.0 m/s, is ziwt s9g7s2 +hdirected across a river with a s hzi7+2w9 tgscurrent of 6.0 m/s. What is the speed of the boat as it crosses the river?

参考答案:    

标记此题
62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The driver of a motorboat that can move at 10 m/s in still water wishes to t,31wf2ft0b8q,fad xkly/hmsxl9c c( ravel directly across a river 1.6tq ,k , dlwh(s 1a93cx/cxflym82bff0 km wide in which the current flows at 5.0 m/s. How long will it take to cross the river?

参考答案:    

标记此题
63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The driver of a motorboat that can move at 10 m/s in still water wishes to h6fy9q3h w9edf y* yh4travel directly across a narrow strait in which the current flows at 5.0 m/s. At what angle upsfhfhh 4d3yq69 *yyw 9etream should the driver head the boat?

参考答案:    

标记此题
64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A swimmer heading directly across a river 200 m wide reaches the5xc 8 r1 whs8db3hszaj+* bar) opposite bank in 6 min 40 s. She is swept dow1h d s35w *bj8 abrz)crhax+s8nstream 480 m. How fast can she swim in still water?

参考答案:    

标记此题
65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A swimmer heading directly across a riv ) 6ome::atlbier 200 m wide reaches the opposite bank in 6 min 40 s. She is swept downstr ):e6litb :amoeam 480 m. What is the speed of the current?

参考答案:    

标记此题
66#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
A boat, whose speed in still water is 1.75 m/s, must ao2+1gn+on 6u cuh+c,9ecm dnpe6d f/ lim upstream at an angle of pucd 2u eoeo1+h,6nndc f+6g/c+ lmn9$26.3^{\circ}$ (with respect to a line perpendicular to the shore) in order to travel directly across the stream.
(a) Determine the speed of the current.
(b) Determine the resultant speed of the boat with respect to the shore.
参考答案:    

总分:66分 及格:39.6分 时间:不限时
未答题: 已答题:0 答错题:
当前第 题,此次习题练习共有 66 道题
本平台(https://autodiscover.51fly.win/)支持练习,作业与考试(自动评分)三种模式,群组成绩统计排序导出,题目动态变量实现同卷千人千题
如果您对本系统感兴趣,想加入我们或者想进行任何形式的合作,请加微信 skysky1258

浏览记录|手机版视频|手机版试卷|使用帮助|51fly国际课程 (https://51fly.win)

GMT+8, 2026-4-18 08:05 , Processed in 1.507898 second(s), 165 queries , Redis On.