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: 游客未登录  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 ig 3ykjhv+u0s9ysn/ 0v fp8)gmn space to another. Make a comparison between the displacemen0m /9 gykvj)yh+8fg 3vpun0sst and the 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 h0y rbg-q wo f1cl;l. /gtrzp3zs:( 9uobject equal to the instantaneous 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 adv) ks.nsn+o* piertises that their car can go "from zero to sixty in 8 s".sn)p+ *.sni ko This 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 thg*hk z1o m4 d8;7bcfafe +x axis 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 direction) begins toq (d.+4p6qgr,y5 cl//tgivii ev3pyl slow down as it approaches a traffic light. Make a statement concerning its acc /ypl6+pdiv leycq.(4i/ tq 5gg,r3 iveleration.

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 travelinz 0s 4db)cvsup+( *shlg to the West (-x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its acceles)p4( *+uvs sbdl 0zhcration.

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 w7,vubg4dt 8bj gn(0d iith a constant velocity. Make a statement concerning its accele8nb 74j vtdudb(,ig0gration.

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, does it mean that the acceleration is zef sz(j837q7q/t. tsassx s,xvro? Support your answerxvs8 z (jtq7fs 3xqsa7s/s ,.t 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 wwr j-xw5j7.kqs*y7vwn :chr( hen its acceleration is constant? Support your answer with an examj *77w5- skrnqcvjw :x.ryhw(ple.

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 acceleration. Make a oi;*one.tzt m,/l1 qu8)vhjystatement concerniuon8* 1; /o),m iveyztlhqt.jng its motion 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 itsm 7 z9zoqpadklob1vc5 s0o8,: acceleration is decreasing? Support 1kv9blo 0,8mpzdzso 5o c:qa7 your 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 in 2qt8kfh r a.(5fd0lwyitial kick, moves up along a smooth hill of ice. Make a h k5rt2f l(w.0qya8df statement 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 equ1 p7wznac .yy;al to the average of the object's initial and final velocity?zp nyw.c;7y1a

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 the same d;8t wn0;hw9sa(r uhnbvn,3 trate. However, object A accelerates for twice the time as object B. What is the final speed of object A compared to tha n;0d rhswt9,nv (b;3nhuta8 wt 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 st9f*;xwhu 4fyc*;qngdy ufx c47 /lq9dart from rest. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the distance traveled by object A compared to that of o*d 9dw*q97yfyg 4n ucfqcx;l;/ xf u4hbject 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 restmp cr1k/uf 4x x8dr47gqe:rv; and falls in the absence of friction, which of the following is true concerning its moti x4m re/ rfqkgvr81c:p 47;duxon?

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 xvr q) 3,9.o7m ffammkof friction, which of the following is true concerning its motovff)qma7,3 9x rk .mmion?

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 velocity anpb:d+m y)ef9t t v5+vjd the acceleration when th9+t ) e:vd pjmfbyt+v5e 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 thrown79vj+ th,awr2r/su zd straight up. What is its acceleration just before it reaches its highesth+vra uwd2r/,79sj tz 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 up, reaches a maximumwgpc: 2r0:oz t oe-f5z height, then falls to its initial height. Make a statement about the gf tr0oe-ow: z5c :p2zdirection 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 straight up, reaches a maximum heiaijl hn svma it7at-,tf +)cof);31,kght, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball is comins1-atfalijkn ,t7 )c )th+m; 3iofav,g 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 air re; 0,rik- c5en via:oo2z zp;zksistance. Make a statement :z v ; ap0c,;nkioe5 o2z-kzirconcerning its acceleration.

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 hig:: i8pykd yvsq -5,efxh-flying plane. What is her acceleration when she she reaches terminalf: e5x-,:yqkpy 8idv s 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 identical second bx 65y7 bxsjgf) ;ik3kf5fxi+mp+nlp5 all is thrown upward with a speed 2v (twice as fast). What is the ratio of the maximum height of the secnpf;+) 7pflkik5+xmfgys b5j 5i6x x3ond 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 bm :wx4)iirl3g uilding. One second later, ball B is dropped from the same building. As time progresses, xii:3m4g) rlwthe 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 seh33) 0bulcohw*z0ms,8zknm z cond later, ball B is dropped from the same building. Anchzh8w k3o3zl mb0 z0m) *us,s 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 from the to lyv)qxwd4 p,j2 kf(3gp of a tall building. One is thrown up, and the other is thrown down, both with the same initial speed. What are tx4j(gqd2 pwy,v3kf l )heir 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. A second 9wh37f)f8 tql- daxr l64sdoobrick is thrown straight down from the same building. They are released at the same t7o4qdo3-f wl8l)x s h6a dt9rfime. 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-zero velocity in the na *mpt +.rkc:+x axis. The position versus ti :*pmcn+ktr .ame 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 non-zero acceleration in the +x axis. The p) +ftuwvyuch) /)lea.ru4xi /osit/ xtare.4uw)uc )ilfv / +yh)uion versus 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 withw-, u hd.;(, zmyt(z/mhsvt iy constant non-zero velocity in the +x axis. The velocity versus time graph of tsm, .dum(yz;h t ti/y,-h (vwzhis 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 constant non-zero acceleratiowvjrjo(/thusrp3(1 x 1z )k bo*spvq3z2:o2wn in the +x axis. The velocity versus 3wsowp1j/2:r2o) vpzots 3qv1b*k rzj (x(hutime 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 giv6eb/9n6rx /fbmj (ow ses

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 hv6 efjv+ b4t)(vp,naives

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 curxnn0y ayg jxu , gb*.1a6x1cb,ve 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 ver+ crcqmwk xmx6c*s402 sus 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 o h w k;))x.ma27v 8xr4xfoyqlvbject is a horizontal line, the object i; 8ovk r2qxl7vfwhm axy4 ).)xs

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 grad1sv+ngok (iaonap6 :qs )k-7ph of an object is a vertical line, the object is7o+qispg6k nsakv )d(-:a1 n o

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 is a horizontalds5i4 01nkk fp line, the object i f50d 4nip1skks

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 and5ghrib,g kel .rlw az -1z84, angle of 30 degrees with the time axis, the obje 4ae ,zr5.81whgzlirgd, -lbkct 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. Find l3tr nl8kx3+t both the distance traveled and the m 8xtn l3lk3t+ragnitude 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 04 x0q+/bdabnnjc w8i water. How long will it take to move 12 km upstream in a river flowing/ a8i0 wcnbd0q4+xbjn 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 8s,hv/is8jm8 . n)pw t*hng/j k,db pqmi = 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 speed in orderrq,wmsm ky;:1 i:xpt93 t8.f,qu fbrv 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 42.0v*j6zq1b- jryg s e. ,jk2mn8z km) in 2 hours and 57 min. What is the average speed of the runner6 r j k e1bvjnz*zmy-j8s2q.,g 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 9*) :bard ictglong does it take for it 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 0+to7ii ay02bj cfrq,the distance that light travels in one year. The speed of light is 3.00 x 108 m/s. How many miles are there in a ly? (1 mi = 1600ay0, co +f2jir7tb iq9 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 alohmo +v+v v:g4ing a straight road and you look to the side for 4.0 s, how far do you travel during thisighvvov+ m+4: 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 10;k3g ;yql14)w/k jg8vnk smt u0 s, your average velockj)4 u vk1km t;3 /g;nwys8lgqity 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 thed,3+anr.*klc7 c kr* bwv 4ond North Pole. It travels 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. This trip takes 45 min. What was the bear's average s 4bwcnco alkd,k3*+*rnrdv 7.peed?

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 Poly c0mgznb, dwh4:kc:mf5v4 2zd9c w6he. It travels 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. This trip takes 4d :wb4mg04vyw ckz,26fd95mh nccz:h5 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 o*xm*15b ivcuun 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 home after dribm*u 5i 1v*uxcving 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 ng3f ik)38-,opc/tgevk r a(q4lml l y eu-/g7average k- ykmggo4l3av/l 8 le/7t)e p,3 ru(gi-nfqcspeed of the 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 100 km/h. Wpr5f6 fq/eltkd w5nhx,af:yd82: w-fhat is her average spee,tk :52fdey:wfxw/a-lp6 nq 85hd rffd 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 thenvgjo+ e -uodf0m:c,5t at 250 mi/h north for 750 miles. What is the average speed for the ttv-ec ,j50g+ o d:ofmurip?

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 person 7v-8 *xssbi8*(gyv 6lokoebr 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 leabrsb6*kov88ov( y-7 ile* sg xd 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 yzxs j xiyk *720edb68di6+pwpp, wo( 10 s. The car's average velocity during deceleratiw68s2+d xoy7i0 wp k(x6zpejpiydb*, on 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 fro+hm1z (c- tkoc s,t8. tgjane y,ft+ r.q/kb2sm 100 m/s to 160 m/s, at the average rate of mytz1ks.f 2t,n+art .q -+ob,c/ 8etkjcg(hs $15 \; m/s^2$. 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 rau*v4x fnqc.s da*8c;cr-f n z7q +7dgste 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 and acempunaxo7x + gxhy 8; 1yo7op27:lah:celerates 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 accpt o0s9jt6 ojra95b)veleratio 0 prbj5tsav)j96ot9on of $2.0 \; m/s^2$ 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 5.0bfibnk3n4.,tj, 9k2 ;qk gnnt m/s experiences a constant acceleration of 2,ngt b,q3i jnk9 kn4;ntf bk.$2.0 \; m/s^2$. 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 righ 5:*j5 e,)/ tmdzet)c oxycrfat (+x direction) with a speed of 500 m/s strikes a sandbag and penetrates a distance of 10.0 cm. What is the aver/*)ct,mf55jzayo :)e texrc dage 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 launc3cvw p-t7m6s;ukc ub/hed from a catapult on an aircraft carrier. It reaches 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 the catawt-cm 3s67b;/ cuvpkupult?

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 accele)0. c 7bqasnsz8mm+wc ration 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 23n7f l -lxo0cy7s zmq700 m. What is its average acc n0m7zqf377o lx lsc-yeleration?

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 ad -xip+t t70blocgea87 kf x(jocm4* :nd undergoes uniform acceleration. During the first second it travels 5.0 m. How far will it travef-i j* p(kx74dotgcct0mo la e+8b:7xl 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 9+ep9wp, zhlvopdy a7fa98iz4n 45 tg constant acceleration. Initially it is travelpgo58zae+t9 hy,v4na9 fz94 d7p iwp ling at 16 m/s. Three seconds later it 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 rest and aknqfy cbvht(sk g9lmn)) w3;0b 7l i56idp0(h ccelerates 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 abouf1mu /lml +ygk;k6 pl4t $5.0 \; m/s^2$ 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 shk:* 48lykn bturns green, a car that has been waiting at the intersec*:n84b skk lhytion 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 surface of planet X wh +; azkl3ppmd0ere the ap0a kmd;3 lz+pcceleration 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 upward with a speed of 12 m/s on thejspx.2ma1gzq uas4 z35,-h ut surface of planet X whejzzs5.a4u 1sxg u3hmp -q2t a,re the acceleration due 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 awz r4 kxc q:q-;x*8mso speed of 15 m/s on the surface of planet X where the acceleration due to gkrs;zwmq 4-o*cqx: x8ravity 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 ofq/ :d9hh .sm /h):7pfwdcf6czh nc4v0fb1b ca 14 m/s on the surface of planet X where the acceleration chad4fpcc0m/f 6 qdz.:b w91cs :fh/ bnv)h7 hdue 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 ux8s )l5v)kfsusually greater than 0.10 s. If your friend holds a ruler between your fingers and releases it without warning, how far can yous fk)8u5x l)vs 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 vemhmhf vam2 hq+ncb*7o)c4 ;*vlocity of 19.6 m/s. What is its velocity after 3.00 s?4mqh b*+chn;ocf2m7 mh* )va v

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 sjtg-5g 8 ct-vytarting point in 10 s. What is the ini gvg5j8ytc-- ttial speed 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 sp01fgdii9 yct;i a0m5cme/(tleed of 36.0 m/s. How long does it take to returm;imdlt(0y ctif9e5ac0i/ g1 n to 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*uxptx.zzr5c ; mleu, . ,9tgh a building with an initial speed of 25 m/s. It strikes the ground after 2.0 s. 5gz xx. ltme,,.cuh;rptz9 *uHow 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 numerical vlif6a -;p )u*pmmhn.balue in m nh.;i up-p*l)fb ma6the 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 30.0 mu d0l6iegh /95 qk/ d4ivto4takho e87/s. (only fill in numerical value in thelkio uv6hoq8 tadth/4 i4 k 0dge5/9e7 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 velociojjze+ k/i :h* q1u+fnty 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 velocit2evj:1 b wq )wu4yk*xi -jalh)y 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 thv3 e;kzvp7e v+ai4lz1e velocity 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 the velocity at oz4w3tlm1+/yri. e t(grxi 2*gyz ;lgp;2syxt = 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 velocllab*d.dq-h 9ity from 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 velo 4 tp9wkpi;-g ecy3o2xcity from 0 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 1.0 sy)0l+*r ilqunv xel./?


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 thewc,u )*xx l3vk acceleration 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 h w2f3jivkj-/ average 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 the average acceleration from 0 to 8.r zh3lu5kb)4c0 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 8.0 s?q c*g1l1kv26cjgec:go(oghu :4ji)u


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
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 00:44 , Processed in 0.638308 second(s), 216 queries , Redis On.