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;46 ysy8 -f6sdbtzsg vk(ke x bgu fb2v,:3sk* travels from one point in space to another. Make a comparison between the displaceme(kvey6svs2-;g 4 bf*ktb8kbx:yf3g z ds ,su6nt 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 obje c dvcr,x1q+ stona179ct 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 advertises that thg cjm(z91dx5 neir car can go "from zero to sixty in 8 s". This is gzn cd95(1x jma 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 axis experieh yxqn.r 516ons* 3hk (ng 1um -8szts5vnbp6unces 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 (+j6 ox+t khe42nt+gkg:x direction) begins to slow down as it approaches a traffic light. Make a stat xk2 6+g4hto ng+jt:ekement 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 trarpk**(a4n a mn+w/uggveling to the West (-x direction) begins to slow down as it approaches a traffic light. Make a*+4/(aagrgwpnn* k mu 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 co5:o au ,lx5ugd oy4a8bnstant velocity. Make a statement concerning its acceleoy4g, 5axd: luu5 8aobration.

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 accele(i 1xz v)ihuv*ration is zero? Supp h *1zuvvxii)(ort 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 ch 2hlup0m36 s:h 7bzlvi0.gim yange direction when its acceleration is constant? Support your answer with an mhb6ph20lvmgi s.z : y07uil3example.

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 accelwscp5sh1 l/va9s4n0cut/v 7 pitvj; +eration. Make a statement concerning its motion with respecj5c+v u14i;tn7/9vp asw p /c0tshvslt 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 ac;f3db+d 8px muwjl/,dceleration is decreasing? Support your an; p+djblu3,mwddf8 x/ swer 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, afterw0wjm hkl56 ., dlxv8(po6x zf an initial kick, moves up along a smooth hill of ice. Make a statement concerning its accelera5,wl6jx. x(mwfvd0khp oz8l6 tion.

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 equa hk2 qb5,);8k ijtq:s-do:ljdfuqrh * l to the average of the object's initial and final velocityst fql2h;i)u: ,oq-kkjbj5* 8dqh :dr ?

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 samc2-(p,.t ig gvk0vj thly0n/be 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?(licjv 2bv g, nt.kg0hy0p/t -

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 accelerate at the samf kt9qsxh8 d*s (h).awzl.2mxe rate. However, object A accelerates for twice the time as object B. What is the distance traveled bzw.)2 d(as9 .x t8xhhs qfmlk*y 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 a: ggafg+: zb6and falls in the absence of friction, which of thg+ a:gfbzg6a:e following 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 frictio0ps 0+kowb t4u53wqtx *nl2y on, which ofbntt 4+u l0o2qww3yx*5 sp0o k the following is 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. np,ubo l:op jfj*9:)w Make a statement about the velocity and the acceleratilj:jp*n)ufo p , wob:9on when 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. Whatawuqm6yih y0w4f 7y*9 is its acceleration just before it rey* w9m4 fiuq6hayy07waches 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 up, reaches a maximum height, then falls to h8 (n mc3kxkpzw .1w1h7r7uli its ( c.kxwim37n 1ur pkhh7w1lz8initial height. Make 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 straight up, reaches a maximum hyt/j,b:bd /cseight, then falls to its initial height. Make a statement about the ,j/ct:s bb/dy 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 downward in the absence of air resistan+ ;4cd6ysgtdnw(xsb3 +t o0zpa4w s+nce. Make a statement concer4y bw6s+g0tts+s(+dc ox; nza 3wpd4nning 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 high-flyspuc,q .s5i bwkya(:pbd 39l9ing plane. What is her acceleration when she she reaches 9kla upb5cwy s9i:,bs.p3q d( 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 identical second batx; i02 -(dx. uu+m2nwuighckll is thrown upward wmitxu-; cx 0.w+ ki2 2nhdug(uith a speed 2v (twice 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 later, ball *x/beo,;pyb a j )ni;aB is dropped from the same buia n;p/,)bxeby; oi j*alding. 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. uqz) (s,e4ahu One second later, ball B is dropped from the same buildingqu(ezs4)h ,au. 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 from the ogha;*w 3 a)wvpx5.mitop of a tall building. One is thrown up, and the other is th w;mo*3wvgia)p x.a h5rown 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 ofu 6 7g iyt8em*r x,+gp2o*iiko a building. A second brick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare the accelerations of tk 8o* 6i*mx2y,+e7griputo ig he 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 axis. The positi tshx-5r qvgx:2.ldb +c0(tveonq5tx-ldr (0 ecb+st:v2vhg. x versus time 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 axisy o l:sc0n;*qd tjm-a1. The position versus time graph of this object i l;*mns jc0q:d -oa1yts

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 const b8kfej )q3k8jant non-zero velocity in the +x axis. The velocity versus time qe8f)b8j 3jkkgraph 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 ;e h75m8bxz s,8z( iglvfxh/jvt 57 aowith constant non-zero acceleration in the +x axis. The velocity vexo, zbx v8 5m gv/i7;h(sf ajlte785zhrsus 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 grartxb b zsq 016ooahn,e.o 0y92ph 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 v; d u.cl2*pyisersus 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 a/p3ynt8f r 4mucceleration 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 gre(cd. yvuj:; xaph 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 h14r50 edf ahzdorizontal line, the object iszdhdar5 0f4e1

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 object ,zyeo no+q0w-is a vertical line, the object is-ooyzqe0+ w,n

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 horizontal line, thedc/8ci 7cv np9d5 h0vd object isd8 7/c cinvdvdp 9c0h5

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 versfq 8tcpbmv 256wzq() qus time graph of an object is a straight line making an angle of 30 8tqz vf)2bw qq6cpm(5 degrees 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 :)xqw+ pseg p.south. Find both the distance traveled and the magnitude of the displacement vector.xp:.)s+p wge q

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 u,o(4esb8i1 lu lwj-ulong will it take to move 12 km upstream lo i4 blw(j8u u1use-,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 = 1609 m)wzegbjvd/,dk +:;rw1(s6wz d

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 i ga bgu+6wjudoc1kx6n- (b-1n n 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 (approximate xb3 gkr.j6r/rly 42.0 km) in 2 hours and 57 min. What is the average spegr/k.xj6 r3rb ed 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 it to travel 400 kmk hnm gp9d3n f62/et sum9)x*5qi2xnn?

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 l;)ma 5r)p bsxeight travels in one year. The speed of light is 3.00 x 108 m/s. How many miles are there in a psam;b)e5 x)rly? (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 and you look to tejdz02v3uw d(m*b: ol he side for 4.0 s, how far do you travel during this inattentive peri ( l0udeov3m2b w:jz*dod?

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 100 s, your 7fsoy)4b tl, th0bup9eql4c sd;i1h5average velocity 4lbsfb4y ) d5;hsuolptec01ti 9 ,7qhis

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 Nor eoxo ppg w i(e2m jg5-ly77m49eu5 r8qgym;b0th 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. Wh5 8m5l9euippoyw ;7 j q4 -ogm72gb( xgreye0mat 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 tjd* u9ffw;tol9e /.o at the 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 9/9 j*d ofw o.ul;tfetaverage 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 f)awdk7f yacp-+z 8 b;jrom school at 55 mi/h for 110 miles. It then starts to snow and you slow to 35 mi/h. You arrive home after drivi;+7a)jca-zpfk b wy8dng 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 +br w wou7 t97s3kal,ze jnf*ec*)r uknn(.+rat 80 km/h and 160 km at 100 km/h. What is the average speedl.*ew7nw7 jo ktnksn+,rrf3b ez( c+ au *r)u9 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;w nln1 se e;sqm5e8. bk:fa9t.0 h at 100 km/h. What is her averman 9f.nks;;qe15ewe l8bst: age speed 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/ wp:+ld+oiid4/sl v: eh south for 2.00 h and then at 250 mi/h north for 750 miles. What is the ave:l/ldsiviwo d pe++ :4rage 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 an7ks gxntiol+5v1tub4*v b7 h8(v5g rjchorman (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 that v*xgr(u7vh s5ito4tkj v+8lg 5b 7n1bthe 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 uniform beu6b)iem4od9td t6 7ly and comes to a stop after 10 s. The car's average vedi m9t o e7)b6d64eubtlocity during deceleration 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 taxd8;g. p6;mffwk8l*ff bm+ ro 160 m/s, at the average rate of fgf p*bxmmd6ra+k ;; wf8.8lf$15 \; m/s^2$. 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 rate of z5n ojch,/ bdbpw9z+ dg,g85n :*ejhn$2.0 \; m/s^2$. 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 accelerates+ rf3oq s/vz:b 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 c76a-0xvitw-dc 0 o;nrk aua 5tonstant acceleration ; 5d7inrt awouct xa60akv-0- 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;9bd,so h9 uzr1tlaqo6; ol,d velocity of 5.0 m/s experiences a constant acceleration o9loor;b9u atd6hsdo; l z,,1 qf $2.0 \; m/s^2$. 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 speed of 500 k2.qn ,cfa vcbvwgt;;:tk:zuw 9 m9t9m/s strikes a sandbag and penetrates a distance of 10.0 cm. What is the average acceleration, i g:9m kfv, nc k 9;:ut2;twqctab9wzv.n $m/s^2$, 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 cecsnoo 3,;5 v 3)6 oi y+a*jzxs;wttnratapult 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 ot)tw 3+s3zno6 c;ineo5 vayo , ;sj*rxf 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 6 xo.+rk vgg vl8)v6f79v xjaxconstant 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 its averag xceuwt 3x+sgvzod137vtya5fbh.q;fp,m +07 e acceler+wezshuy;x 0vc7oq m5. 7v tf+1pxad ,3tfg3bation?

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 unipxi6umr 8( pc,form acceleration. During the first second it travels 5.0 m. How far will it travel dur xu8(cim p6p,ring 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 st8ijh7 l((udsvz(rc+n ec 76:8my heo nf6m y;uraight line with constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is travelie h(68( c8m (nuvmse:7 ry7ujzfnicod;h+ l 6yng 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 (ha cc hn;0u1n-eklj/ 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;:5ci kzdclgvp (zx21 on a dry road can decelerate 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 gre;74a r cmzrtp8en, a car that has been waiting at the intersection star8 rprt a4z;7mcts 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 surffel 34tw/mlg2 ace of planet X where the acceleration due to grag2/fet wm3 ll4vity 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 the surface of planet X whe k:kpdw.7iij. re the acceleration due ik i.7jd:p.w kto 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/s4t00jsiy7v3e ep rek83 nu ee6 on the surface of planet X where the acceleration due to grsu7 6ee pr3 e0yeje8kv0i34nt avity 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/s on .w/hui3lghe4-d9j rnrs0c9 p+2x zro the surface of planet X wheouh/shjr+2 49pr -rcd3 xei0z.gn9 l wre the acceleration 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 hol7 8*mq4apq oc9nswb3tds a ruler between your fingers and releases itn4pt*qo 3 9wmsc7aq b8 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. What is its velocity +d zoc6g5z7 cbpm;a x.after 3.00gm+ob5;x6pza 7c .dzc 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. oz+4,z-sx wpzyn.ld 6 What is the initz.y4zz nw + ,6so-lpdxial 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 spe6tj37p bff*mqql e3*led of 36.0 m/s. How long does it take to return to its startingfmjpqtl* *6fq7e3 l3b 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 building witv*) b*5prki2qg z) z6o/jbuvkh an initial speed of 25 m/s. It strikes the ground after )*vk6og zr5 k*2qip) /ub bzjv2.0 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 s3rsuv(m;. ;rg+aies t;g *cbmpeed of 30 m/s. (only fill in numerical value in the bg.bm c3vegt mra *;ir+(;sus;lanks)
(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 thecul :0 f*sg3ckusv8o, air with a speed of 30.0 m/s. (only fill in numerical valuel,us3gccv s0uf*o8:k 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 velocity armeaijas ): -p.f5cz.t 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 tubme j0 19at 5jts,, .ex-rdzv = 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 velocn1f*fn 5ep 0hr8li. srity 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 t =m.8( dt6xww fq 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 hp;. fpdt /x+xthe average velocity 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 velocity from 0 ttz1-hyx ;c/c2 h8 wcmghg)h 2i/id1 ezors()zo 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 accelera fy- a(jhpm*8ction at 1.0 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 acceleration ,l0 ( h.awofsiat 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 isis;yvf.i :m2 i the 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 q4os v;.2jq+pyz7kq o 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 iso.s 7xi+p5yd5vll e g) the displacement 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
本平台(https://mail.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, 2026-8-16 23:54 , Processed in 0.532390 second(s), 216 queries , Redis On.