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 Unit2: Kinematics One Dimensional Motion



 作者: physics   总分: 98分  得分: _____________

答题人: 匿名未登录  开始时间: 22年07月19日 23:10  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  
  Suppose that an object trk32moz4f z4 bzavels from one point in space to another. Make a comparison between the displacement and the distanczk b m4foz243ze traveled.

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  
  When is the average velocity of an object equal to the in0kwcze .z;9a5ipj 9zc1s5cw hstantaneous velocity?

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  
  A new car manufacturer advertises that their car can go "from zero to sihy+aw kr6u l:)d7 0yvbxty in 8 s". This is a description of k:dh 0b7yvyau6r)+wl

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  
  An object moving in the +x a zia8-vy49yz b3yae x6xis experiences an acceleration of $2.0 \; m/s^2$. This means the object 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  
  Suppose that a car traveling to the East (+x directionlo6 p-hj ,2z5dp*oqul ) begins to slow down as it approache-j z6hpo,p5olqd2l* u s a traffic light. Make a statement concerning its acceleration.

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  
  Suppose that a car traveling to the West (-x direction) begich6k pdi j zzlb(vb:;rq+e9(l79 0vkvns to slow down as it approaches a traffic light. Make a st(9rkz d6v ej:0 l7p+ilch(vqbzbk9v;atement concerning its acceleration.

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  
  Suppose that an object is movit,-(zqa deq vk7p8wj5ng with a constant velocity. Make a statement concerning its accele-a,edzj5q 7kv( tp 8wqration.

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  
  If the velocity of an object is zero, pha( , 4gda kw81b)zqgdoes it mean that the acceleration is zero? Support your answer with an example.8dg ahq zpbk14(a w,g)

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  
  Can an object's velocity+p+-mns8y lguz5h +eh change direction when its acceleration is constant? Supportnh5g e+y 8+p+mlsh u-z your answer with an example.

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  
  Suppose that an object is moving with conf 4i9a * 7aq:rt6bbcnpstant acceleration. Make a statement concerning its motioncbq 7nab6parft:4*9i with respect to time.

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  
  Can an object have increasing speed while its acu:z1o, duo oy(s) ,qohceleration is decreasing? Support yod: ou(h1uq,)s oozoy,ur answer with an example.

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  
  Suppose a can, after an initial kick, moves up along6wwad k6c f;c(0 bhlt* a smooth hill of ice. Make a st;ha0 wlck *df6w b(6ctatement concerning its acceleration.

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  
  Under what condition is average velocity equal to the avervi;l9fat7n u;l03x -fw .qhrzage of the object's initial and finn7z;tha0-.llu 3fq fxr;w iv9al velocity?

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  
  Objects A and B both start at rest. They both accelerate at thenmkp g)3liv*. zns+i 7 same rate. However, object A accelerates for twice the time as object B. What is +v slmi g.7n*ik )pz3nthe final speed of object A compared to that of object B?

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  
  Objects A and B both staus:zch sr0;8brt from rest. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. Wu:zh8 s 0scbr;hat is the distance traveled by object A compared to that of object B?

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  
  When an object is released from rest and falls in the absencqarol,* a3a/vqn g.8ke of friction, which of the following is true concerogl*n.qaa/3ar v,8q k ning its motion?

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  
  When an object is release3szw7nmszu1t6e(6h f ot4-p ad from rest and falls in the absence of friction, which of the following is true concerning impet( 3nh6s tf7uazz s461w-ots motion?

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  
  Suppose a ball is th h wgg*rqf/wp7 s);o5zrown straight up. Make a statement about the velocity and the acceleration whenz7h);or pgqf *gws 5w/ the ball reaches the highest point.

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  
  Suppose a ball is thrown straight up. What is its accelerbquajd.52 s -ration just before it reaches bqjras.-d u52 its highest point?

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  
  Suppose a ball is thrown straight u v-s.( ab,9, usqlyttsp, reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity andtt,( v,y .a9ssb-uslq acceleration as the ball is going up.

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 ball is thrown straight up, reaches a maximum height, then fallsr,+ i xvw17rx34e3yzg mfyb tq v16*rd to its initial height. Make a statement about the direction of the velocity and 3 1d4x x1yqmrg3veifrt67 ,b wvr+y*zacceleration as the ball is coming down.

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  
  Suppose a ball is thrown downward in the absence of air3wgjhtcs+4 hszd3m ,og1 3ar2 resistance. Make a statement concerning its acceleratio,tsj1d 43wrhzagso2+hc m3 g3 n.

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  
  Suppose a skydiver jumps from a high-flying ptn9 +zp htoskjpya b995f75b6lane. What is her acceleration when pjkn+o5 5safy t796b9b tzh9pshe she reaches terminal velocity?

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 ball is thrown vertically upward with a speed v. An iden,sb 4x9zd3zu otical second ball is thrown upward with a speed 2v (twisdou9x 34zb z,ce as fast). What is the ratio of the maximum height of the second ball to that of the first ball? (How many times higher does the second ball go than the first ball?)

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  
  Ball A is dropped from the top of a building. One second late3 q vop4s.syqenlh-8qcs) 1s3r, ball B is droppe4 vyq)os1q h8q.l3p3 ssc sne-d from the same building. As time progresses, the distance between them

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  
  Ball A is dropped from the top of a building. One second later, ball B iyem;mog dcm43k cc/qgj))29m * q p:ios dropped from the) d:c*cq9;q)4ig32k mcy ommjogm /pe same building. As time progresses, the difference in their speeds

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  
  Two objects are thrown fr5a b pu9ad.rvs)p0* 6vu2.x0sxs npohom the top of a tall building. One is thrown up, and the other is29oavsu6n ..0)v r*x0d5xp bap sphus thrown down, both with the same initial speed. What are their speeds when they hit the street?

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  
  A brick is dropped from the top of a buiwmvo7fry 0kn,y i.l3d qhbn:k s*(0u-lding. A second brick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare thsvy- 0n( kd ifkur.m0*,hloq y 7nw:3be accelerations of the two bricks.

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  
  An object is moving with constant non-zero velocity in the +x axisld2( qct)6l tl. The position versus time graph of this object is(lt26 lt)lqd c

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  
  An object is moving with c.95u gpi2ric2pk *cdy onstant non-zero acceleration in the +x axis. The position versup2 95.r*ii cku2 ypdgcs time graph of this object is

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  
  An object is moving with constant non-zero velocity i6jgo ))vpa1qf wbws-kg :-kh4n the +x axis. The velocity versuj)1hw)p-q kbak4:fvwg6sg-o s time graph of this object is

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  
  An object is moving with constan/od vpc+qtzy(jjoy,2du;l0 0 t non-zero acceleration in the +x axis. The velocity ve+y0 l;qz2p0tvd do,(ju/yocj rsus time graph of this object is

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  
  The slope of a position versus time graph g6bv78bmq8 :8tsbn dbb ives

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  
  The slope of a velocity/ks5 rqz2b5j( fcekh/ versus time graph gives

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  
  The area under a curve in an acceleration vers r0l2 :4aoysgvus time graph gives

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  
  The area under a curve in or s k,:ptfk 6m++q 7.qsvlr99 o**y5wetetnpa velocity versus time graph gives

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  
  If the position versus time graph of an object is a horiz5qht:st 85.in,mczgk ontal line, the object itg8 i5th.zm:s c qn,5ks

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  
  If the position versus time graph of an objm:r7u: nrw:jkgn+jr 6 s.bvv1k* 7faqect is a vertical line, the object is:6m vvrrjb jfn*7.uwgka1s::r 7k+ qn

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  
  If the velocity versus time graph of an object iqp ylxfff-92 *c,1 hzis a horizontal line, the object chfqzxilfp-91 ,fy *2is

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 the velocity versus time graph of an object is a straight line making an an6:f: 3hqyvnch gle of 30 degrees hfc q ny3:6hv:with the time axis, the object is

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  
  An object moves 15.0 m north and then 11.0 m south. Fgaz ld tv1q q8a/.76+wh,htr0 -i tenxind both the distance traveled and the magnitude of the displacement ve.teg,h6 qxi-hzwla780va d+q t/ tn r1ctor.

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  
  A boat can move at 30 km/h in still water. How long will pcok uyk1wgz 7nm7( +*p+woog f95-mait take to move 12 km 7up (y9af+7mgwkzo cg*+oo1nkp-5w m upstream in a river flowing 6.0 km/h?

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  
  55 mi/h is how many m/s? (1 mi = 1f ;b8/: a ;dgjq,r qbby9vp-qt609 m)

参考答案:    

标记此题
44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What must be your averal06d (yey t8)a og2ovgge speed in order to travel 350 km in 5.15 h?

参考答案:    

标记此题
45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A runner ran the marathon (approximately 42.0 km) in 2 hours and 57 (i:lsn* ,p3,tr mj6 d/on yfa g8m (rivd9sts3min. What is the average speed of tsp9,fj,i/t: sl 6d(n dgtn msrio8avy* 3 3rm(he runner in m/s?

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 car travels 90 km/h. How long does it take for it 4wauo9am,t0 hf 0plsoyq9 5 n8to travel 400 km?

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 ly (light year) is the distance that light travels in 3hdh -rmxb1riy-2 q4 /w)rutdone year. The speed of light is 3.04xdwdm q1u 2 )/-r-ir3rbhyht0 x 108 m/s. How many miles are there in a ly? (1 mi = 1609 m, 1 yr = 365 d.)

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  
  If you are driving 72 km/h along a straight road anjfm/j2i7* .pel: de hod you look to the side for 4.0 s, how far do you travd o:ij7*f . 2emplh/ejel during this inattentive period?

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  
  If you run a complete loop around an outdoor track (400 m), in ks56 8pcj*pvo z8 x.po100 s, your average velocit.8oxp5cj6*8vop kp szy is

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 polar bear starts at tpo/ a45spp3y 34jmmk hhe North Pole. It travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west k 3shpjp4o ya4 5mp3/mto return to its starting point. This trip takes 45 min. What was the bear's average speed?

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 polar bear starts at the North Pole. It travels 1.0 km sou7p j9fyp y7ozo sa 9+ )7ysk;eaqp5g7 n*ipy;yth, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its star7a*pyaq 5nzyjf k; e7i7o9sg p9yps7 po;yy)+ting point. This trip takes 45 min. What was the bear's average velocity?

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  
  You are driving home onh/g+by+n. gcu:v . mdo a weekend from school at 55 mi/h for 110 miles. It then starts to snow and you slow to 35 mi/h. You arrive hom.mco.dv:bhgn +gu/+y e after driving 4 hours and 15 minutes. How far is your hometown from school?

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 motorist travels 160 km at 80 km/h and 160 km at j hmm1scdvb5lj818d4 100 km/h. What is the average speed of the845s8jb1 dmhvc ldjm1 motorist for this trip?

参考答案:    

标记此题
54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 10sy480og4ms6q alrj e(z p:i* v0 km/h. What is her average spe 0vp4*i rys6 lesqo:4m a(z8gjed for the trip?

参考答案:    

标记此题
55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane travels at 300 mi/hzl;fc:;e klkf3/(v cy south for 2.00 h and then at 250 mi/h north for 7;3vfc/kk e;:fzclly (50 miles. What is the average speed for the trip?

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  
  In a 400-m relay race the anchorman (the petjf;jj h,+et f vrdt61h*tc/)n ou0h 9rson who runs the last 100 m) for team A can run 100 m in 9.8 s. His rival, the anchorman for team B, can cover 100 m in 10.1 s. What iv+*c6oj/f,t)u ;tn1 ttfhej hd9 r h0js the largest lead the team B runner can have when the team A runner starts the final leg of the race, in order that the team A runner not lose the race?

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 car decelerates uniformly and comes to a stop after 10u q2bfrtg :85j s. The car's average velocity during deceleratioqjgfrt82b 5 u:n was 50 km/h. What was the car's deceleration while slowing down?

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  
  An airplane increases its speed from 100 m/s to 160 m/s, at the average rv. xoyo)y+:lfwigk5 3ate of wvo5f.o y) +k ily:gx3$15 \; m/s^2$. How much time does it take for the complete increase in speed?

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  
  A car traveling 60 km/h accu3d* r (al0gqyelerates at the rate of $2.0 \; m/s^2$. How much time is required for the car to reach a speed of 90 km/h?

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 cart starts from rest 3sr3 vu d0kqaazz58a 5and accelerates at $4.0 \; m/s^2$ for 5.0 s, then maintain that velocity for 10 s, and then decelerates at the rate of $2.0 \; m/s^2$ for 4.0 s. What is the final speed of the car?

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 car travels at 15 m/s for 10 s. ic6+a7nc1(+ ; vlhk/lfpf tn cIt then speeds up with a constant acceleration onc6an7c/l l(+h;ktfvfp+ci1 f $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

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  
  A cart with an initial velocity of 5.0 m/s experienra; zg:6i k(yeces a constant acceleration ofz e6:; akiyr(g $2.0 \; m/s^2$. What is the cart's displacement during the first 6.0 s of its motion?

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  
  A bullet moving horizontally to thev psma eite/ke9p76vkv 62h2z-h 4 8ki right (+x direction) with a speed of 500 m/s strikes a sandbag and penetrates a distance of 10.0 cm. What is the avera6 8-t sv7em ehz2hk/p46 kv2v9k ipieage acceleration, in $m/s^2$, of the bullet?

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 jet fighter plane is launched from a catapult on an aircraft carrier. It r,,;ms z bui2-:eur3s ydzt 3bwkee(/eeaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming the acceleration is constant, what is the length of tsez s ,kt2 i 3-:uy(e3wu;,eerd/bbm zhe catapult?

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 car starting from rest moves with constant accelerr y9- av6-ixwkation of $2.0 \; m/s^2$ for 10 s, then travels with constant speed for another 10 s, and then finally slows to a stop with constant acceleration of
-$2.0 \; m/s^2$. How far does it travel?

参考答案:    

标记此题
66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car goes from 40 m/s to 80 m/s iar j6sggc +c6.f,nyk -fa4-fan a distance of 200 m. What is its average accelera- fnyc6a6fac j,g4 r+ka-sg f.tion?

参考答案:    

标记此题
67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object starts from rest and undergoes uniform acceleration. During the f,7ev2qy c 5ivbopg;.cirst second it tpi2bg5q;7o yev,c .vcravels 5.0 m. How far will it travel during the third second?

参考答案:    

标记此题
68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is moving in a straight line w3yd w2 hw-nyr g73y52u rpj(lnith constant acceleration. Initially it is traveling at 16 m/s. Three seconds later rj h5n u (pdwr2n23-wg3lyyy7it is traveling at 10 m/s. How far does it move during this time?

参考答案:    

标记此题
69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car starts from re2 f1ywpg;x0k;u l8tuj st and accelerates uniformly at $3.0 \; m/s^2$. A second car starts from rest 6.0 s later at the same point and accelerates uniformly at $5.0 \; m/s^2$. How long does it take the second car to overtake the first car?

参考答案:    

标记此题
70#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
A car with good tires on a dry road can decelerate at aboun u7qz+-opmj x 8 g7cmgy/d4,ut $5.0 \; m/s^2$ when braking. Suppose a car is initially traveling at 55 mi/h.
(a.) How much time does it take the car to stop?
(b.) What is the stopping distance?
参考答案:    

标记此题
71#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
At the instant a traffic light turns green, a car that has been waiting at thed-2edjaw.2fr4.; kn ;v lqbe o intersectionendj4q-.2;w o;vr2kdelb . af starts ahead with a constant acceleration of $2.00 \; m/s^2$. At that moment a truck traveling with a constant velocity of 15.0 m/s overtakes and passes the car.
(a.) Calculate the time necessary for the car to reach the truck.
(b.) Calculate the distance beyond the traffic light that the car will pass the truck.
(c.) Determine the speed of the car when it passes the truck.
参考答案:    

标记此题
72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is thrown upward with a speed of 12 m/s on the p,bml*c skds69x f/1dsurface of planet X where th,spl9cd/ xd6m* b sf1ke acceleration due to gravity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

参考答案:    

标记此题
73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is thrown upwa)j9aqk9 l whl1rd with a speed of 12 m/s on the surface of planet X where the acceleration due to 1lkjw9hal 9)q gravity is $1.5 \; m/s^2$. How long does it take for the object to reach the maximum height?

参考答案:    

标记此题
74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is thrown upward with a speed of 15 mmh*rcm q4 f*qn2r6d-zip1 yx6/s on the surface of planet X where thriz*dxhy*64 -1cqqmmf6 prn2 e acceleration due to gravity is $2.5 \; m/s^2$. How long does it take for the object to return to where it is thrown?

参考答案:    

标记此题
75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is thrown upward with a speed of 14 m/s7ihyad)(z9 fb on the surface of planet X where the acceler(hybad zfi79 )ation due to gravity is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

参考答案:    

标记此题
76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Human reaction time is usually greater than 0.10 s. If your friend holds a rule: avrimmd 3nj .0 fzj3bd7;2swr b3bais. ddz2j;f: vnjm w7mr30etween your fingers and releases it without warning, how far can you expect the ruler to fall before you catch it?

参考答案:    

标记此题
77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ball is thrown upward at a velocity of 19.6 m/ z:86:s nlgykas. What is its velocity after 3.00yng6 k8lasz:: s?

参考答案:    

标记此题
78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bullet shot straight up returns to its starting point in 10 s. What is the il-iql+s2l i;wnitial speed of the bulll2sqw l-+ lii;et?

参考答案:    

标记此题
79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ball is thrown straight up with a speed of 36.0 m/s. How long does it take to bwx /jobxovu c97.15- sgfdc7rs-f :i return t bjxorsg/7-.vb1uo: 9ccsi -f7fwxd 5 o its starting point?

参考答案:    

标记此题
80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ball is thrown downward from the top of a build1z f/ ux7 t9w/szam(vqing with an initial speed of 25 m/s. It strikes the ground after 2wzza/v s7m9tx1/ qfu(.0 s. How high is the building?

参考答案:    

标记此题
81#
 
填空题 ( 3.0 分) 切至整卷模式 搜藏此题  
  A ball is thrown straight up with a speed of 30 m/s. (only fill in numeric- u(gq xvey:g0al value in the blanks - q0yv:(eggux)
(a.) How long does it take the ball to reach the maximum height?    $s$
(b.) What is the maximum height reached by the ball?    $m$
(c.) What is its speed after 4.2 s?    $m/s$

参考答案:    

标记此题
82#
 
填空题 ( 4.0 分) 切至整卷模式 搜藏此题  
  A foul ball is hit straight up into the air with a speed of lq f1p i5p(b-m30.0 m/s. (only fill in numerical value in the bl iqm -5pb1fpl(ank)
(a.) Calculate the time required for the ball to rise to its maximum height.    $s$
(b.) Calculate the maximum height reached by the ball.    $m$
(c.) Determine the time at which the ball pass a point 25.0 m above the point of contact between the bat and ball for the first time.    $s$
(d.) Determine the time at which the ball pass a point 25.0 m above the point of contact a second time.    $s$

参考答案:    

标记此题
83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-1, what is the velx,ees ld ;njo fv6/7.locity at t = 1.0 s?


本题所包含的其它图片:

参考答案:    

标记此题
84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-1, what is the vegs71 vq mh *,72p zkrah1oaog6locity at t = 2.5 s?


本题所包含的其它图片:

参考答案:    

标记此题
85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-1, what is the velocity at t = 4.0 7p/1rz-a0g ia+z9e stxz ;qp ys?


本题所包含的其它图片:

参考答案:    

标记此题
86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-1, what is the velocity hih0 l50 fb;qfat t = 5.5 s?


本题所包含的其它图片:

参考答案:    

标记此题
87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-1, what is the average velocity from 0 to 4e 0mb gi2z)c,8-yk gil.0 s?


本题所包含的其它图片:

参考答案:    

标记此题
88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-1, what is the average velocity from 0 exsmj c/e+g80g5bt1q pw-b+ nquf3p)to 6.0 s?


本题所包含的其它图片:

参考答案:    

标记此题
89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-2, what is the acceleration at 1.0xe,+yqt0bch85kmd / c s?


本题所包含的其它图片:

参考答案:    

标记此题
90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-2, what is the acceleratr 8sj8 -xfj 3i4hsw,pqng2 v3xion at 3.0 s?


本题所包含的其它图片:

参考答案:    

标记此题
91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-2, what is the avera 5(5+i fh/ otv*rxlhfpge acceleration from 0 to 5.0 s?


本题所包含的其它图片:

参考答案:    

标记此题
92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-2, what is mu4 zfrq*3u*1:/0knxw jap ngthe average acceleration from 0 to 8.0 s?


本题所包含的其它图片:

参考答案:    

标记此题
93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-2, what is the displacement from 0 to 8.*ubn-ed 6ap :c0 s?


本题所包含的其它图片:

参考答案:    

  • :
  • 总分:98分 及格:58.8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 93 道题

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

    GMT+8, 2025-6-28 09:06 , Processed in 0.754238 second(s), 216 queries , Redis On.