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 following is an example of a vector 6e:ax e s41wwzddbr(lb: .4pvquantity?

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 cha70 o,cmpg 0w6jnf g+abnge a vector?

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 accurate s3cb 6nay;+ feen*w:tutatement?

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 when the angle between them is w wqtz3x be.3zx:.v.v

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 and 7.0 m, qb-w1 v0vtei2respectively. When these two vectors are addedi-v1v0eq2b wt , the magnitude 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 magnitudes 20 and 50, are added. n k mvo9kn,(tq h-z(l*Which one of the following is a possible answer for the magnitude of tkzvlmo n*hk(n(9tq, -he 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 30 N, puqzf pv (. t0gb0as/-rwll on an object in directions that0z/v pfqb0 tgw(sr .-a 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 veco;52 d rc5ku ilk:fsq:tor is


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, the horizontal component of a projectile's veloc g,s ;)t42 ahf,aci2jx+y zvdaity

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 ;m8gs6x4 o djtm mad+.rd9d4p 20 m/s at an angle of 60e above the horizontal. What is the horizontal component of its instan dr aod m.49+m8dsx64;pjmgdttaneous 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,akf w3uxlunx3y0* km:z */ v1y the horizontal component of a projectile's accelerationf/yy n wkz 0xu:uk1l*ax*v3m3

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 velocity of 25 m/s at an angle g)6ec6e j;mxsof $45^{\circ}$ 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 of an object is directed anti-parallel to the vk,u 362p cgkbhelocity vectg,32cu6pbkk hor,

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 rr+ir2/l -xizalways directed perpendicular to its velocit2+rzr-xili r/y,

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 be aimed in 2lsgtmzq89n3 ) p(*xwbf mau:order for the water to land with the greatest horizontal ranzam pg82(ql*bxs 3w9 n)fmtu: ge?

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 javelin at i0kx(yb 2,)uh rfcz 8ffour different angles above the horizontal,ifbh8f) yurx20z ck (, each with the same 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 leaves your hand z r)l .qd*.drmwith twice the velocity it had o)*d d.rl.zmrq n your first throw, its horizontal 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 original speed of 8.0 m/s at an angltu;.ws+t v4ck e 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 itl. o8l2rzloe.d/uus, +l v l9x3fd7nu s speed comu. el llfovl.o 37z/u,d2 uxs+dnr9 8lpare to its initial 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 from the top of a towtmd2if o2u,uv6fqs/r;vi2 , di*7 prver at the same instant a ball d7*io62divv ut/2,v;sfpq 2rf r ,u imis dropped vertically. 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 hori /h)op/qw5o1npas bwses1 42m zontally, and at the same instant a second bullet is dropped from the same height. Ignore air resistance. Compare the times of fall of thebe4h1n5 ssq owp o a2p/m)sw1/ 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(, i:hm*j3 1xosklkir 160 m drops a package. Two seconds later it drops a second package. How far apart will the two packages lanrx ,hli13(j *km:kois d 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 fro h;x;etwx(rkp0i7zm 4)j i) iem a plane, and one second later a second package is dropped. Neglecting air resistance, tr;) 4pi eie(k0;wzm i)htj7 xxhe distance between the falling 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 horizontally at a constant speedmjh ;bs(pc)+p *;xwvy . Neglecting air resistance, when the bomb hibs+jhx)cm w;vpp (*;yts 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 on the Moon is only one-sixth of th :rohmy4xk mwwsv*9 h*m ;bo3)at on Earth. If you hit a baseball on the Moon with the same effort (and at the speed and angle) that you would on Earth, the ball wouldwhm yhsov)mow* bk:4 * 3;mxr9 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 rel 3 s7nwfl4x(wegv rb7k)b+u 3sative to a straight, level road and pass a carsg wulnk+() 3fwx77b rvs3b4e traveling 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 crosst )-uaudjhq ,h79xd6 e a river that flows due south with a strong current. You start out in your motorboat on the east bank desiring to reach the west bank directly west from your starting point. You should head yd, ) dj-67uu t9xhhaeqour 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 x5/cr bb g/g,jik, vt1at 30 km/h in still water. How much time will it take you to move 12 km downstream, in a river floj5/g,1 bg/v brktic ,xwing 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 lksx21 /xsnlyrv/ .a0 30 degrees below the +x axis. The y comp02/ys/nrv. xaxkll 1 sonent of 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 with 0gi-f8f6fcwnm*adenry c*7pe1 . 1 tk 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 nortdtw0 . s0kpwxwhw6) h9h of east and you end up 2.0 km north and several kilometers east. How many degrees north of eahwt09dwhx w k)s0wp.6st 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 x component of its velocitj,k+v ;lr rwv *vidb+;q+.samy is 8.00 m/s. The angle between the direction of its motion and thrvv+v +jm b;a,.dqri;l *kw +se 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 long shadow over a level gpwzb52wl6x wam(xemc38 vs 4( round. At what angle is the Sun el34mp5wcwxbv e6w 8s(l 2xa (mzevated 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 componur7o5-b .ru yoents (0, 1) and (-1, 3), respectively. What areour 5bu-o.y r7 the components of the sum of these 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 has1)svprji xyi 286q+ttce n3ms 68w.azbs 3c 2ve components (0, 1) and (-1, 3), respectively. What is magnitude of the sum of these two vecits2px)2s6tmjq63v+ c1.n8c8se a3 zrbsy iw tors?

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). Vba9p/ro wdc )*ector C = A + B . What is the magnitude of C ?9pboa*c w/)rd

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 * r.)vzl7latonm.g bm 9kok56the magnitude of its displacement?bml56ookv n*.akt.9rmzl) g7

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 Cartesian coordinates, bg6 wj4p2n.-) i3+nhdbdta;z ugw;hn 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 Carkd w u7 5lhmvecc; (:jpym6*.mtesian 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 v5w 7eg qtj2zm/, (cyxvlf)r t8np.a*vector B = (+3.0, -8.0), what is the magnitude of vector C = )wq5vjt2gpe (fy m7l8/racvn *,.zxtA - 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 circuv6ty1 bw f2co fr)z 08ph kg3m0ek+i8jlar path of radius 10 m. What is the displacement k8op yg 82ke+zvb frwihfc0mt3106 )jof the jogger?

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 -sl c3e kzan8ub5a)f4 magnitude of the run3)-4 8sab5eck lafz esultant 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 object as shown in Fig. 3-1. What is the0kb5 (gmu:yoap ;x-tu g e +/.i)rntvc direction of the resultant forc+0a:vu te-oy nmp;.gg) 5tk(ub/i r cxe?


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 poin(uis6ia *v zgxv))*h r2i5mfpts along the x axis. Vector B is 7.5 cm long and points at +30e to the negatir ausx6vfi)*h)g*2i v(z5mpive 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 points angnf)z/( ahh3 t $30^{\circ}$ 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 speed of 10 m/sp taco 5xp yzci:n8fo1170l8g n v5:qc from the edge of a cliff. A stop watch measures the stone's trajectory axg1 cnqopn0pccoi5yvt78:flz1 5 8: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 horizontallop /u:pi+hn(c y, with a velocity of 10 m/s, from a bridge. It falls 20 m to the water below. How far does the rock travel horizontally befo u+:hop/ ip(ncre 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 ground, strikes the gzy/5o)gbk1 zrnel 8k 3 hf) .niy)lp8oround after traveling horizontally a dishn)bpkn) kz188 y/.o i5z)g el lr3ofytance of 18 m. With what speed was 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 goes into the jump with a speed of 1*y9ly , o73 6tkzkir fd.ty6a:/q jsip2 m/s at an angle of * ,tpkjyf/36t7droy silyq a6i9 k: z.$20^{\circ}$ 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 7*axcqmg.,y9ik e4 )g+qfv:oxn m 5a cjump with a speed of 12 m/s at an angle of:xm 7aa+ v4c5c mio.,qgnyf *e xqg)k9 $20^{\circ}$ 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 at an anglekf0 o7o7 4ffsp 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 with an initial 2z-,: f6*vv rjwd edycvelocity 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 angle ofr 7kpdj n1)8th $30^{\circ}$ 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 horizontally at 23.4 m/s from the roof olo:1z itn.fmo,0 o s6gf a building 55.0 m sgo ni60:omo.tl zf1, tall.
(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 fired from ground level with an initial speed of 55.6 m/sza l,on(:ouv 0 at an anzunao l (,o0:vgle 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 a 1500-m race at a velocity of 4.0 m/bq5n+87(a l /-tgrw w/ stpgfuwbbh7.s. If you ran the same race on a day when you had a constabg+- bq tfs h wwp utb(/87w.agn5/lr7nt 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 is in a wind of 50.0 m/s to hp hy+ o *lcje8;4sbb;the West. The plane's speed relative to the gro oyj+*s ;hp;ch4e8lbbund 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 South (nl jiwx.)(0w:;ldj w5(yn yqp$270^{\circ}$) 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 speedd,)l+ 4bd vyed of 120 km/h 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 200 m/s horizontally fires a projectile ew* fe, zf9kmsu3; im;with speed 50.0 m/s in a forward imefu;wf3; ,skme*9z direction $30.0^{\circ}$ 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 directed acrg m.;-ovrwyo ;oss a river with a current of 6.0 m/s. What is the speed of the boat as it crosses the rivervm;;wr-o .g yo?

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 motorpdu7 ; kiwc gf1oka/m, )+yrr,v 0p+dqboat that can move at 10 m/s in still water wishes to travel directly across a river 1.6 km wide in which the current flows at 5.0 m/s. How long will it take , mr)pr;cygi 1d k+,/udokvapw0q7f+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 wis36l3 dixre0uxhes to travel directly across a narrow strait in whicx0 e3r 6ilu3dxh the current flows at 5.0 m/s. At what angle upstream 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 3m+. *dle,/ flo2 p+er upwwukxs/y8ea river 200 m wide reaches the opposite bank in 6 min 40 s. She is swept downstreaku,./wedo 2plel p8 mux*/er3s+ y +fwm 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 acrossm oke349t yxd.3n j3kk 1ae3mi a river 200 m wide reaches the opposite bank in 6 min 40 s. She is swept downstream 480jmn3eom k3 d9y13 3k4ix tek.a 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 aim upstream at an angle oul84 +n)s dzofu+ hkz9h1rv.:7 mxm ftf +h1f7ud)mrzx+9v of8t.nhlz :k4um s$26.3^{\circ}$ (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

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, 2025-12-20 05:48 , Processed in 0.346126 second(s), 165 queries , Redis On.