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 travels from one point in space tn vx5ntz tm)o,m12m/0mmf p p1 3yjzw-o another. Make a comparison between the displacement and thpmnoxnmz f/mtv 1) 2 zj0tmw5,m1p-y3e distance 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 instantaneo*j zmefl1:b(h us 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 2- kdz4yw s-rftheir car can go "from zero to sixty in 8 s". Th4 -sky zwd-2fris is a description of

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 ax6mtou0qf-/),y bg clpis 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 directionf md gv btoj3y3h/d49.) begins to slow down as it approaches a traffic light. Make a statement conv f34mbjh./ytdg o9d3cerning 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) begins to slow down vev j)k fsg b5o1x32vbqyu*) em +lit 8br/0:gas it approaches a traffic light. jo05x)mr b/ gl:fsi2eu1ve)g38k yvv*+bbt q Make a statement 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 moving with a constant velocity. Make a statement civ9 2m:uejsz dh2c /2qoncerning its accelerat9 iudqeh2cjs zvm22 /:ion.

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 zezpvj2knro:v2:ka5a ,e ) 5rhp ro, does it mean that the acceleration is zero? p ,rh)vn5k5z2ar e:jovak : p2 Support your answer with an example.

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 change direction when its acceleration is constant?*lb 1 qufmlolil6k4+ 1 Support b k*1l6 q1fl uol4lmi+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 constant accelqdf)gl3so,cl,mx)3 g t8z1pj eration. Make a statement concerning its motion witglpx,8,gz jl)1c f3 ds3 o)tqmh 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 w2 /no z( vx;ibl8yiwd1hile its acceleration is decreasing? Support i2vdil1x( y8/wz ; nobyour 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, h ow h 1mul(-dm;rtqz-f( q x51zg-8mmmoves up along a smooth hill of ice. Make a statement concerning its acu-mogz1m z(-(-qm q8rl dfw htx;h51mceleration.

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 average of the object's in(cv k1 qq87xgeit1g(7c vxk8eq qial and final 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. sci1whlqm4fx: 6 0 sx0b+lxa* They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the final speed of object A compared to that of object B?qi*m: 1xbxlws6cx0 0 4afl+ sh

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 start from rest. They both:6heqoeu 0r+ z accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the dista hu+6 rzoeq:0ence 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 t0nnp9 x/ v8 8,ilqwfv:k5cvdehe absence of friction, which of the fonx9nkv8,/cevv8l 5 p fq 0d:willowing is true concerning 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 released from rest and falls in the absence of friction, whibjle,,wcb op9 ; 9x5ncch of the following icce,bx9l;b pw9njo ,5s true concerning its 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 thrown straight up. Make a statement about the vvf,;cg63/qky/ yw a:9be nspgelocity and the acceleration when the ball reaches the highest pe9/6yga sgpy,k/c bf3;:wqv n oint.

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 acceleratio+xj 2bk+ fak32gxtg(wn just before it reaches its highest point? xk gf +b(txg2a3+2jwk

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 up, reaches4sow3xox- ebl7pj z( 8 a maximum height, then falls to its initial height. Make zb 4(oolxj-exs83 7wp a statement about the direction of the velocity and 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 straue(,1ob-4g2q e*c8(/ zxz hhfyprdty ight up, reaches a maximum height, then falls to its initial height. Make a statement aboutxy(/rzh(d*gotz1 he8,e y-bu q42cf p the direction of the velocity and acceleration 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 doavexptm+3vpp/ un50 1 wnward in the absence of air resistance. Make a statement concerning its ac3p0mp5tvxe+1 u anpv/celeration.

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 plane. What is howa2ux m5dr5(er acceleration when shea2u5 (ordxwm5 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 vertical: zi6+yuk1f 6kb/wwj jly upward with a speed v. An identical second ball is thrown upward with a speed 2v (twice as fast). What is the ratio of/i6 kbj+w wf61 yzuj:k 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 han),j 8 .njsgzi2ta3second later, ball B is dropped from the same building. As time prog iz2n. jta8n,g3)jas hresses, 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 laorm4.i s dp,q5) d.nhdter, ball B is dropped from the same building. As time progresses, the differencn,sdmpo d hiqd.5r4. )e 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 fro4 jhd d;7sid5nm the top of a tall building. One is thrown up, and the other is thrown down, both with 74ndi5sd jdh ;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 building. dtetgs/ zv0zm)3c z,22pyf.e A second brick is thrown straight down)2c/3,etzvsdt y.2zep zm0gf from the same building. They are released at the same time. Neglect air resistance. Compare the 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-zerzo0 :emo f*ag4o velocity in the +x axis. The position versus :gzof*e4o ma0time graph of this object 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  
  An object is moving with constant no5*)xuomjx4 + 5idexsmn-zero acceleration in the +x axis. The position vsdxx 4)ex5o mmuj5*+ iersus 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 vbf9 sz 5;cn*ta4 onzkyh0,v7i elocity in the +x axis. The velocity v4 tvnc9h5;,iy7z szb*fna0ko ersus 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 cey p 44nokgi;b8at 07wonstant non-zero acceleration in the +x axis. The veloci0w np7 by;gti 8okae44ty versus 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 tilyl7 hhjd93a( md3w;t me graph gives

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 versus time graph g(2 cvr,g7 anf1jz os2aives

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 cury)jhfloo69t ( v5tl53v kwp tio48.a ave in an acceleration versus 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 a velocity versus time g n(gjjc + *ld8y(g2bsnraph 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 /i1fqrz kpqdj e r+xqzl-7* /pu16rk. object is a horizontal line, the object / q.rlqx *pz6+r7rp1e- d/k1kifq uj zis

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 qad ex g- buo58(9dlltb. ,9eeobject is a vertical line, the object isubg(.-o q59eelax 9dl,t 8deb

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 wf p6a0xzco4 j(9o;pm graph of an object is a horizontal line, the object is 0xwapc;fzo46j9(m op

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 timew8 +-sb ( or)z+higv)xbkn (eo graph of an object is a straight line making an angle of 30 degrees with the time axis,z) ib(h)vrkson eowb+ g+(x-8 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 sox(oi6gnm 45mz(/ wjwy uth. Find both the distance traveled and the magni5om4nw(w /m 6zy(xgji tude of the displacement vector.

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 n--hy zk( 2/l64a5t u xpema:.j zozmhit take to move 12 km upstream in a river flo.ux ez-4-za6n m5j(tlzyh/ po mak:2h wing 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 =p3aj(ovrl0;d yyu,1 f 1609 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 average spee2 s0klbq 9b5)4grp 3fc jcs.hod 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 mins3n3e0zf2y d klhg/oc.b d2d+. What is the avera3 0+g.ydc2onf bh32sklz/ded ge speed of the 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 ie*9 rbne+t6di t to 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 distance6qk;i5c1*p iyb ico ,p that light travels in one year. The speed of light is 3.00 x 108 m/s. How many miles a cicb5kop1ip,q 6 ;y*ire 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 stig9x5yu9s ;m1(bgr/c vz.kvo raight road and you look to the side for 4.0 s, how far do you travel durigb5/ ;oz9 1v9 vimy(u .gkrxscng 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 arounf);yuiq( p g4fd an outdoor track (400 m), in 100 s, your average velocity i)4(uf qypfgi ;s

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 the North Pole. It travels 1.0 km south, z2m pp3)dy *vj-)h2zylw r 6pjthen 1.0 km east, then 1.0 km north, then 1.0 km west to return to its pp rj2zm 6vy hyj)wl2-) zp*d3starting 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 tra+ e0b dk 0jc+b:jsspcn -rxq87vels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its starting point. +jcxb+ eqs80 -j7 k:0pdcnsbr 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 on a weekend from s;a8 880xwqz w7c+u* dnifc iyfchool at 55 mi/h for 110 miles. It then starts to snow and you slow to 35 mi/h. You arrive home after drx78zwn 0 u8d wyqi+*fc;afci8 iving 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 100 km/h. What is the d6-cxy9do hn(average speed of the motorist for y6-xn odhd9(cthis 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 100 km/h. Wko 0 w9hnp 3wi/*frd0bhat is her average sphw 3 b /dnor0f9*ipwk0eed 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/h south for 2.00 h and then at 250 mi/h north ) +6vz wii4drxfor 750 miles. Wh)xwi 6i4v+rdz at 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 (t h aiw . 8qocr-t j.so28vqo7sog(f+,the person 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 is the largest lead the team B runner can have when the team A runner starts the final leg of the race, in order t-t.ior8tcoa.w ghq+sq 2j (7o, ofs8v hat 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 cowfbjaej)s,v -0 r;qm8dyg. o *mes to a stop after 10 s. The car's average velocity during decelera8rog dbys e-f0a.jv ;,m*)qjwtion 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 rat8-)lllr ji5*b ravcugg 3k;6 w+rwnx*e of c ljb3 ruw8 *v;-r)* l rxkaglinw+g56$15 \; m/s^2$. 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 accelerates at the f0xnms)x6hx+ f z7m z/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 isvn m,t76(s f-jo9u cand 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. It then speeds up with a constant acc(kpw+nej :+ ooeleration of ewpnjo+:k+(o $2.0 \; m/s^2$ 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 experiences a constant accelerat,2i7 /mem)k y bflo 8jdzd6p0jion odbip,ylmkf70o82 6 jjzm)/def $2.0 \; m/s^2$. 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 the right (+x direction) with a spgo :rh;+qnqa ;5 -zklceed of 500 m/sr h+o:;ck lqznqg5 -a; strikes a sandbag and penetrates a distance of 10.0 cm. What is the average 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 aawq/;tc(q3q (fkvex4x +f f) st f3+inircraft carrier. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s.as3+t (ff fc qx3/ni ;x qt)4fkvwqe+( Assuming the acceleration is constant, what is the length of the 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 constantef9eohuzl s h.:47:attj2e9fzf )ty0 acceleration 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 in a distance of 200 m. What is e)n3a) 5bawh 6w)r.zi o1bsru its average acceleration?. iwor1 53nzw6ebaus rhb))a )

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 firidsu)lypys)td:)i *, st second it travels 5.0 m. How far willui)*yyd p :, )sidls)t 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 with constant accelitgs,o-1 17zfugm qu6eration. Initially it is traveling at 16 m/s. Three seconds later it is travelii7gm,u1 tuf6g z-q o1sng 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 re t+ a4vi4/emfmst 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 decelerd,l0twlgdwu1s0g 1;s ate at about $5.0 \; m/s^2$ 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 ta75)jdd2knrd9 k t3 ebeen waiting at the intersection starts aheaj5d t)kn932ka7 d dertd 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 spt*wc fn4)kdpy6 ja75i y,h, vurface of planet X where the acceleration duey tp fij)cdkw*hpav 5,n6,y74 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 upward with a speed ow z*5w*-gf j:rl;hjh df 12 m/s on the surface of planet X where the acceleration due-r*g:wz 5;*fjjdwhhl to 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 m/sw 0 ox+lay)ep9 on the surface of planet X where th)op0+ae9yw l xe 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 tl 83e):mk d 8(:vuwdn(zeiysdpjvj*6f-,tdupward with a speed of 14 m/s on the surface of planet X where the accelerati:l8 pd (sudty:iz*jen6 j e, v-mfdv8)tw(3kd on 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 usualw v3 8wsfvg:3bly greater than 0.10 s. If your friend holds a ruler between your fingers and releavw3wfs b83:vgses 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/s. Wharfzb/(di1/jvq1k z a;t is its velocity after 3.001q//i zj;kvdbr( fza 1 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 vit:/ k,jfrp2 initial tp/r:jikf,v 2speed of the bullet?

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 v)67bw x0lz4hgs;af ,qqw5u c take to return to its starting poina7;b0,c4xvq wq )6uszhg f5wl t?

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 downplcr0.+o24wp; tuzm j ward from the top of a building with an initial speed of 25 m/s. It strikes the ground after 2.0 s. How high is the uom .0pprt +;2wljcz4 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-hle.,n47+cilg eq of 30 m/s. (only fill in numerical value in tn-ole4 ,l7cq eh+ifg.he blanks)
(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 30.0ds)(u4/ce4*d n vh zxe m/s. (only fill in numerical vdxn/h)u 4 e4cse(zd *value in the blank)
(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 veloci ebik; k3;fxd,ty 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 velocity at t = 2+dudo ox1q 0;h.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 velocit s bjuqb:r0jttu28,7py at t = 4.0 s?


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 t(d0lc (s ljkuezn3: c5zu;sr*u( 5bc che velocity at 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 fjue*-0c/va6wbger* : - fztxlrom 0 to 4.0 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 to 6.2*vl awtzrggv5 6o 4h: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 1.0 s?ksn:yp5 /7xzc


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 acceleration at 3.pemew0b03k6 zq ff1k9 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 average acceler fpu9c*m5a2kt ation 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 the av zo2es,myd -f (;xi1sgerage 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 displ-wa* .g6xq ;scl89ujzd c9f ntog(;ciacement from 0 to 8.0 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, 2025-5-8 06:43 , Processed in 0.439230 second(s), 216 queries , Redis On.