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 in spaceoq9h1ihfpf ash-rk245 k m;2e to another. Make a comparison between the displace4; mq59pfhk 12oarfkh-2si hement 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 anqh kys+pe :j(eel)m05 object 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 manufacturq 9aw za1*u 4;;lsb0jnp2g wjfer advertises that their car can go "from zero to sixty in 8 sq;0z4ls2pj1g wwbn;u *9jfaa ". 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 the +x axis experiences an accelecehr/-t;qn,ci d4jy m ,v- pl;ration 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 tvs)jav)*3 mox/h0gggrm:k x8o the East (+x direction) begins to slow down as it approaches a traffic light. Make a statement concerrm8*ggojx)vm)x /: avh03 sgkning 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 Wel+a6,eqe+ jga3bip .nst (-x direction) begins to slow down as it approaches a traffic light. Make a statement cona nqp bij. ++a6lg,e3ecerning 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 mzg+b oc.d go+pkpo55 (ocq 9:eoving with a constant velocity. Make a statement concerning it5 op od c(pz:kqe cg++9o.ob5gs acceleration.

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 zv zx *27 st28r2qfdpbah1c w3lero, does it mean that the acceleration is zero? Support your answer with an exax3d2 ap2 f1c v72 tlqwzbsh*8rmple.

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 direct4zc5xy1xh1/9z q ukorew9s1q ion when its acceleration is constant? Support your answer with an exam 1hso/w ke qxy994z1qc51xuzrple.

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 acce9dg*k4,k wx imleration. Make a statement concern4 xw,m9ig*kk ding 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 its a uvx, i28kh v5vxf(r0wcceleration is decreasing? Support your answer2(vfv v85ru0wxxk, ih 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 bdp9bw1p (ik, :d8hwm up along a smooth hill of ice. Make a statement concerning its accelerati 9hbwd8:( k ,bipd1pwmon.

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 *y ;j1rg0gqwlnq5 b8ci gjl5wy;b 0 cg1rqq*8ntial 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. They k :ex-fc1fa7-rz 1 py2rj27ohepwc c5both accelerate at the same rate. How7 1xcr5e: zh-7ck pewryop j f2cfa1-2ever, object A accelerates for twice the time as object B. What is the 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 start from rest. They both accelertafsup4+ y) e*ate at the same rate. However, object A accelerates for twis*)p eufy 4ta+ce the time as object B. What 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 ,6;5ddds yt.+jb.5lw u vpdcoabsence of friction, which of the following is true conco,ul. j d5.y5d;dws6+cptdb verning 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 f 0schz 6nox/4irom rest and falls in the absence of friction, which of thezi4son /hc0x 6 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. Make a statement about the velocity aenlebh x 6db5n.8e yo1gq ..w+nd the acceleration whene+.6l qyewd5 go.b .bnxnh e18 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 acceleration just be40gbmfri dz 99fore it reaches its h9r gb9zfi4m0 dighest 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, the2 mipx ,(gczqa tqk+7/n falls to its initial hzq /+pikm7 t,a(qc xg2eight. 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 height, then falls to its/ 9eou2is07e vuf;wj y initial heighj i fw29;eyu veu/s07ot. Make a statement about 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 downward in the absence of air resistance. Make a st6.jygd9bvq x3z*1b m tatement cdy.vx b19gb3*jz qt6m oncerning 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-flying plane. What is her acceldr1 . /fymhen8eration when m8renh/d.1yf she 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.yfbsmirw aa-:,5h ) /s An identical second ball is thrown upward with 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 manys/aim,s wya5 -)r:hbf 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, bxjzm8n7m5 pw3 01zv29 w5npp zz1d zszall B is dropped from the same building. As time prosx7 jzwzz w0n zndm ppz5mzpv 1289513gresses, 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, baqy+ gm,*lsdxn 8pzn3om/576h yf/rnp7esx 8sll B is dropped from the same building. As time progresses, thmehy gsns,nfpmys n/8x x 56qpl7r+do3/78z *e 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 tazr z,9v k:c l.6hlri gw6e1;the top of a tall building. One is thrown up, and the other is thrown down, both with the same initial speed. What are their speeds hlrc; kze:lrg iz wt1v a.669,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 b7rou c16kfc46 / qza/4m wqgjauilding. A second brick is thrown straight down from the same building. They are released at the same time. Neglect air u6c47a/14zrc 6 fgoqwja qmk/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 velz udxfna08,kxk-78y2 h na q6mocity in the +x axis. The position ver yfn hm 08aka62xdxq ,7nzk-8usus 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 accelet.jo;d:f jh,l pq,-nsration in the +x axis. The position versus time graph of th;npfs, jh,q:.d-o tjlis 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 velocu /w+ yprwee0uji4q ,3ity in the +x axis. The velocity versus time graph of this object isru3uj iye+qp 0ww/4,e

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 constl2w oriq vsi:ud*g.d bi7) )dlgij0;;ant non-zero acceleration in the +x axis. The velocity versus time i)id b2j rii.w:;l0sdol 7ugqg*d v);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 givesd*k2 / ec;hf nyp8ysm)

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 g;b8h3w8oaz vtime 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 versus wcdd m/,*xqe3d /.u pcoz/t6ktime 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 velocja k85l qb6e ,is ,zy 9c.-vfvez9aox7ity 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 horizontal line, thbvle9ke u dv30bht--hve9)hj16mr6m e object i3v1ee ml)muv-h0h6d6bek jvh-9 br9t s

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 is a vertical lift *wye8,.-kz8 p+cy zg.w) si+fqg29 ackfgtne, the object is eyqg++ gt)g. ws f*,c9 kwckf.zpaz2fi-8 ty8

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 d t6sfqj24so1, the object sfsjq14 to2 6dis

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 o;w 0*f )k03 rsudkhhs7j p6lmdf an object is a straight line making an angle of 30 degrees with the time axis, the objechwkd*3d07j 6; lu0ss )frphkmt 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 ahp1 yr4 l,dd+xnd then 11.0 m south. Find both the distance traveled and the magnitude of the displacemen1,l y+4ddx rhpt 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 30y-c pbd2y0vi6, z *dbfw2d0e z km/h in still water. How long will it take to move 12 km up0 d-zdbv*ybz20i6 2, c wpdfeystream 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 = 16ph iy89/uevpi3 4d +m4o -ngij09 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 order to travel 350 km in 5.15 h?/5m7xzuloh5nq52rems -r7 ti

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 (approximatkmhlc76koj ( wy76ey 1ely 42.0 km) in 2 hours and 57 min. What is the 6k67j7ckmoy l eyw(h 1average 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 it to travelqve)91zp* z, a*jeh ko 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 dib-q3xq3h+ge x stance that light travels in one year. The speed of light ih+xeq3q b -g3xs 3.00 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 and you look to the sidx v .qq/9.ma-wc0 qrng.f 3wkue for 4.0 s, how far do you trave-.vwg.w .xm n0c 3q9 kf/rquaql 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 100 s, yo/x/ a(giqpxa5v*) fqxzdc5 +iur average velocity is /qzqpi5 +faadvcx*gix)(5 x/

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 travelsh+gxv9 vl5 lq+*k9l cj 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 beark9c lqh* +vl5lv9g xj+'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 travez( .9: zz(ydf .yxqunols 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 t n :yu.o9yz .(qdfz(xzrip 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 school at 55 mi/h for 110 miles. Itct; h d9w *nf:8orcav6/wm v-w then starts to snow and you 6t8dawf rwh;omnwv/* c9c v -:slow to 35 mi/h. You arrive home 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 100 km/h. What is thekiztg;:zp f-+g2s g-g average speed of the motorist for this g z i+g:p gfszg-t-2;ktrip?

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. What is her ave3 * a a8zpi8.j)qmimw8ze ae.arage speed fo.za3zi*8ae8aq. a jmime8w) p r 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/wvac 5li(p :dyu 4d,qy9/mwvxg60g) jh south for 2.00 h and then at 250 mi/h north for 750 miles. What is the average speew)6apxucyy , qggv5/( i jddmv90:l4wd 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 person who runs tztv -u4955ouy3ykxf y he 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 larg 4 5uyt9xyf-v uk5oy3zest 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 co2zm (6cjes xwv1,6 zmxmes to a stop after 10 s. The car's average velocity during deceleration was 50 km/h. What was the car's d(j v6 m62ewx1zsm,cxzeceleration 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 x+m es yl, 3y1fy3iwswes tix,.52g*om 100 m/s to 160 m/s, at the average rate of 2es ily *mx yfgsxei3ws,o .,5y1+wt3$15 \; m/s^2$. 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/hl q6cax:;i6 s+bzg. mo accelerates 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 aacb 1c)t)r m/fnd 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 cg4ha .g/t*qhod r)c h 7.fw7md,q: exxonstant acceleration of aqrch) d*hmxef7 /xg 4o,w7tg: .dh.q $2.0 \; m/s^2$ 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 qq+9tf g 3*e1a)pknf facceleration o qe*1+pfq)3na9ftk fgf $2.0 \; m/s^2$. 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 horizontallypc)a4ldv : gul7-oq l* to the right (+x direction) with a speed of 500 m/s strikes a sandbag and penetrates a distance of 10.0 cm. What is thu:)a*-l 7p o4lcldvqg e 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 launcoh7kb6qs 5;y jhed from a catapult on an aircraft carrier. It reaches a speej hkq5;y6o7 bsd 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 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 acceleration o5t+snrs16r saa j:)zc f $2.0 \; m/s^2$ 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/z/wof8 d w+dcz3e* fq onibtf2.lw 3g9j.-u7xs in a distance of 200 m. What is its average accelqf +o9j.z c u * ndx3wo-8z.ew7fd3gfw/bil2teration?

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 fro4:b9ks5(ztobvse,8n m i6x/ m *vu asum rest and undergoes uniform acceleration. During the first second it travels 5.0 m. How far will it travel durine5zi 4vx svmo a b,s:k/(t su9m6u8b*ng 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 w .b7:kvxxy74uo; wzt a straight line with constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How farzk7 u: w ;ovxxb7wy4t. 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 accelerates uniformlya qjto;u 5cm9: 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 tireotm3u 7bm mzt9nhx 5n,2m,c b+s 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 green, a car that has been waiting at nz;l-* v3tm rkthe intersection starts ahead with a consta z-m* ;rkv3tnlnt 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 ovez n04q4 jx3where the accelerax0j 3nqezv44 otion 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 w5 xu 1j*xpj:bnith a speed of 12 m/s on the surface of planet X whe :1jb*p5xnj uxre 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 a speed of 15 m/s on the surface of plaa:2twk 8 xrku8net X where the accelerkk ux28: atw8ration 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 /s65h) v ue *bcw5miloupward with a speed of 14 m/s on the surface of planet X where the acceleration due toum6l5h ebso5) i c*w/v 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. hlk00 f(+wzh6ify mft lz4*l- If your friend holds a ruler between your f f lf4l zw*kfyl0hzh+(6-0timingers 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/s. What is its vgqq6gc )o-2g kp05g cwelocity after 3.00 kw gq-gc50qg) po2g6cs?

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.msth 5+3ge :o;.hggo;c, cb, akgm mr+ What is the initial speed of the bulleaggcg gh h:5ootr,s+m e,3c ;km+;b.mt?

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. 9wwi-h mem+g,- utu*b How long does it take to return to +mu9-hgt wu -ibm *e,wits 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 building with an initial speedrqd3k ,el5 6 phnr(ak lf +n(/*lkt4k -hv7qpf of 25 m/s. It strikes the ground aftek6fh,rah5l/ fr3e- kq*kdknnl7 p+ lpt ( (4vqr 2.0 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 n:w i4h1r3z2oi8vmh v lumerical value in the 2roh1 zv4 3:mhl8viiwblanks)
(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 straigv4wd j34a 3dvow;l,(itx i86 ykn7fd mht up into the air with a speed of 30.0 m/s. (only fill in numerical value in tid3 li,j3(4 8 fd;awvnodm4yt7x 6v kwhe 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 at tz .ulkvt-06g9xl s vb. zzsz6- = 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 iseg fs1m.x;-)z g(efhk the velocity 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 l /mm7yjjs.aq8k4vqr +r.kvi 3lm 3c4at 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 tgu : wgxy7dh51 = 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 ;zcdptg vnav66n :b,/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 6.0 s?5pvj:pnk:w4faag/: h


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 *x5)n8p 0 x*ayvn7ey+ 5rcmdq*e zkjqat 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 at 3.0 mxr3 p7 , wpr5o/;kfxys?


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 acceleration from 0 to 5.0w1ml.u9n 7 dwe 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 q,22qiv,b0ll z*m(qw w ft7fz 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 displawyefqgp *15d +vk4,swz 5u fg3y,iez0cement 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://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, 2026-8-16 16:45 , Processed in 0.711603 second(s), 216 queries , Redis On.