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PRACTICE：Science 10 April 17 in-class Practice
本Practice来源于https://webassign.org，是在线Practice的打印版，您也可以访问本平台网站(https://webassign.org/)直接在线完成(注册并登录账号后在首页左侧输入试卷号 705 即可在线作答)，，作答电子化后可随时回放，查看每题答案与详细解析，搜藏保存任意题目；教师使用本平台可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力。本试卷的直接作答链接 https://webassign.org/test705.html
 Author: cwphysics    Total Marks: 34 mks  Marks Awarded: _____________

User Name: No Login  Start Time: 25年04月17日 08:15 End Time: 当月25日 09:35  Switch to Whole-Paper Mode

Mark Problem
1#
 
Single-Choice ( 1.0 marks) (No. in Group 1/27) Whole-Paper View eid: 782  R:W 73:80  Correct Percent: 48%  Difficulty: *****  
试卷已过期，处于只读浏览模式，无法保存作答
第 1 题组 (共 27 题 27 分)
  Suppose that an object travels from one point in space to another. Make azu .*u*tj 6nx)ee: nki comparison between the displacement a u )nxk*nju *i6z.t:eend the distance traveled.

Correct Answer:    
Mark Problem
2#
 
Single-Choice ( 1.0 marks) (No. in Group 2/27) Whole-Paper View eid: 783  R:W 114:51  Correct Percent: 69%  Difficulty: *****  
试卷已过期，处于只读浏览模式，无法保存作答
  When is the average velocity of an object equal to the instant5vcf5o vbl +x2aneous velocity?

Correct Answer:    
Mark Problem
3#
 
Single-Choice ( 1.0 marks) (No. in Group 3/27) Whole-Paper View eid: 784  R:W 80:79  Correct Percent: 50%  Difficulty: *****  
试卷已过期，处于只读浏览模式，无法保存作答
  A new car manufacturer advertises that their car can go "from zea8 nfjb)wi l -ve,/w7st,5 uzfro to sixty in 8 s". Thisuf7 nv/t5wjf) es8a ,zi lb,w- is a description of

Correct Answer:    
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Mark Problem
4#
 
Single-Choice ( 1.0 marks) (No. in Group 4/27) Whole-Paper View eid: 785  R:W 94:58  Correct Percent: 62%  Difficulty: *****  
试卷已过期，处于只读浏览模式，无法保存作答
  An object moving in the +x axis w pbwqt05ov gxdn)+f2d* e 4j/rpxj+ 2experiences an acceleration of $2.0 \; m/s^2$. This means the object is

Correct Answer:    
Mark Problem
5#
 
Single-Choice ( 1.0 marks) (No. in Group 5/27) Whole-Paper View eid: 787  R:W 57:83  Correct Percent: 41%  Difficulty: *****  
试卷已过期，处于只读浏览模式，无法保存作答
  Suppose that a car traveling to the West (-x direcup h0+xq:b 1pztion) begins to slow down as it approaches a traffic light. Make a statement concerh1zp: +qu0pxb ning its acceleration.

Correct Answer:    
Mark Problem
6#
 
Single-Choice ( 1.0 marks) (No. in Group 6/27) Whole-Paper View eid: 788  R:W 106:51  Correct Percent: 68%  Difficulty: *****  
试卷已过期，处于只读浏览模式，无法保存作答
  Suppose that an object is moving with a constant velocity i)dpx -hco:v9. Make a statement concerning its acc-9d) p:vohx cieleration.

Correct Answer:    
Mark Problem
7#
 
Single-Choice ( 1.0 marks) (No. in Group 7/27) Whole-Paper View eid: 789  R:W 72:88  Correct Percent: 45%  Difficulty: *****  
试卷已过期，处于只读浏览模式，无法保存作答
  If the velocity of and5wa2wt3p nt7 object is zero, does it mean that the acceleration is zero? Satpt5d 7wn2 3wupport your answer with an example.

Correct Answer:    
Mark Problem
8#
 
Single-Choice ( 1.0 marks) (No. in Group 8/27) Whole-Paper View eid: 790  R:W 74:112  Correct Percent: 40%  Difficulty: *****  
试卷已过期，处于只读浏览模式，无法保存作答
  Can an object's velocity change direction when its acceleration is consta .xdz 2 xitfi: spkt;mf*w-z**s+)sodnt? Support your atikf.;xsx*zo) p mzfs* +t:2d*idw -snswer with an example.

Correct Answer:    
Mark Problem
9#
 
Single-Choice ( 1.0 marks) (No. in Group 9/27) Whole-Paper View eid: 791  R:W 91:60  Correct Percent: 60%  Difficulty: *****  
试卷已过期，处于只读浏览模式，无法保存作答
  Suppose that an object is moving with constant acceleration. Make an g;3axhx:rw, statement concerning its motion withx; 3rn:hwxag, respect to time.

Correct Answer:    
Mark Problem
10#
 
Single-Choice ( 1.0 marks) (No. in Group 10/27) Whole-Paper View eid: 792  R:W 74:95  Correct Percent: 44%  Difficulty: *****  
试卷已过期，处于只读浏览模式，无法保存作答
  Can an object have increasing speed while its acceleration is decreasinkc2kb4)( kcjo35 ue ocd d9 k31ojk9htg? Support your answer with a3ko j(e kc9b1 khc4k)2duo 9jco3tk5dn example.

Correct Answer:    
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Mark Problem
11#
 
Single-Choice ( 1.0 marks) (No. in Group 11/27) Whole-Paper View eid: 793  R:W 45:92  Correct Percent: 33%  Difficulty: *****  
试卷已过期，处于只读浏览模式，无法保存作答
  Suppose a can, after an initial kick, moves up along a smooth hill of ice. /k(s bnc 0iai qtph+s t;w9j34q/v-nt Make a statement concerning its acceler4s ;a h /n+iw i/qtqcbksnt3v-(9pt0jation.

Correct Answer:    
Mark Problem
12#
 
Single-Choice ( 1.0 marks) (No. in Group 12/27) Whole-Paper View eid: 794  R:W 92:72  Correct Percent: 56%  Difficulty: *****  
试卷已过期，处于只读浏览模式，无法保存作答
  Under what condition is average velocity equai 9/+ mt:jj d.37w2rhtyp4 waqnrug v;l to the average of the object's initial and w;idy jjg tv34+nq/7prr uht awm:2.9final velocity?

Correct Answer:    
Mark Problem
13#
 
Single-Choice ( 1.0 marks) (No. in Group 13/27) Whole-Paper View eid: 795  R:W 124:41  Correct Percent: 75%  Difficulty: *****  
试卷已过期，处于只读浏览模式，无法保存作答
  Objects A and B both start y.fyvsq5w .2r at rest. They both accelerate at the same rate. How 2sfvyy.r5. qwever, object A accelerates for twice the time as object B. What is the final speed of object A compared to that of object B?

Correct Answer:    
Mark Problem
14#
 
Single-Choice ( 1.0 marks) (No. in Group 14/27) Whole-Paper View eid: 822  R:W 119:29  Correct Percent: 80%  Difficulty: *****  
试卷已过期，处于只读浏览模式，无法保存作答
  An object moves 15.0 m norgw;snkgv/.rzevs bj98;f*3l th and then 11.0 m south. Find both the distance traveled and the magnitude of the v;gs*b9jr k l8 nwvfs/;3zge. displacement vector.

Correct Answer:    
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Mark Problem
15#
 
Single-Choice ( 1.0 marks) (No. in Group 15/27) Whole-Paper View eid: 823  R:W 78:57  Correct Percent: 58%  Difficulty: *****  
试卷已过期，处于只读浏览模式，无法保存作答
  A boat can move at 30d2(3 sn, pufot km/h in still water. How long will it take to move 12 km upstream in a rod 2fpsn,( t3uiver flowing 6.0 km/h?

Correct Answer:    
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Mark Problem
16#
 
Single-Choice ( 1.0 marks) (No. in Group 16/27) Whole-Paper View eid: 825  R:W 80:51  Correct Percent: 61%  Difficulty: *****  
试卷已过期，处于只读浏览模式，无法保存作答
  What must be your average speed in order to tr+ za6)t( 0zvriyntr,, p, docgavel 350 km in 5.15 h?

Correct Answer:    
Mark Problem
17#
 
Single-Choice ( 1.0 marks) (No. in Group 17/27) Whole-Paper View eid: 826  R:W 101:60  Correct Percent: 63%  Difficulty: *****  
试卷已过期，处于只读浏览模式，无法保存作答
  A runner ran the marathon (approximately 42.0 km) in 2 hours and 57 in5 f ag a:da+qxz+*k,min. What is the avergia +aqk fa5*z:,dn+xage speed of the runner in m/s?

Correct Answer:    
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Mark Problem
18#
 
Single-Choice ( 1.0 marks) (No. in Group 18/27) Whole-Paper View eid: 827  R:W 83:31  Correct Percent: 73%  Difficulty: *****  
试卷已过期，处于只读浏览模式，无法保存作答
  A car travels 90 km/h. How long does it take for it to travel 400 km? b+h)i ;iwsn.t

Correct Answer:    
Mark Problem
19#
 
Single-Choice ( 1.0 marks) (No. in Group 19/27) Whole-Paper View eid: 829  R:W 92:68  Correct Percent: 58%  Difficulty: *****  
试卷已过期，处于只读浏览模式，无法保存作答
  If you are driving 72yagazv 9vr.mo u8h16, .bgk7y km/h along a straight road and you look to the side for 4.0 bm.yy 1 . az978rovgkav6,uhg s, how far do you travel during this inattentive period?

Correct Answer:    
Mark Problem
20#
 
Single-Choice ( 1.0 marks) (No. in Group 20/27) Whole-Paper View eid: 830  R:W 53:135  Correct Percent: 28%  Difficulty: *****  
试卷已过期，处于只读浏览模式，无法保存作答
  If you run a complete loop around an outdoor track (mk)vs7 yl6o5 ;a , fwl dsylfyo1g8d/;400 m), in 100 s, your averagel1ddy/); ,7k ;a5w 6lffvlgms8o yy so velocity is

Correct Answer:    
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Mark Problem
21#
 
Single-Choice ( 1.0 marks) (No. in Group 21/27) Whole-Paper View eid: 831  R:W 64:88  Correct Percent: 42%  Difficulty: *****  
试卷已过期，处于只读浏览模式，无法保存作答
  A polar bear starts at the Northj(3vn( z:ls,wu/qo ql 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 tn: ou/vs wq,3jllz ((qrip takes 45 min. What was the bear's average speed?

Correct Answer:    
Mark Problem
22#
 
Single-Choice ( 1.0 marks) (No. in Group 22/27) Whole-Paper View eid: 832  R:W 67:93  Correct Percent: 42%  Difficulty: *****  
试卷已过期，处于只读浏览模式，无法保存作答
  A polar bear starts at the North Pole. It travels 1.0 k1l7w39mmrjq pm 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 wrp jwlmm37q 91as the bear's average velocity?

Correct Answer:    
Mark Problem
23#
 
Single-Choice ( 1.0 marks) (No. in Group 23/27) Whole-Paper View eid: 833  R:W 97:69  Correct Percent: 58%  Difficulty: *****  
试卷已过期，处于只读浏览模式，无法保存作答
  You are driving home on a weekend from school at +6 (ljptte hf z,n6bk(g9 7fpx55 mi/h for 110 miles. It then starts to snow and k,t zgtl6pfne( j p6hx+7fb 9(you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutes. How far is your hometown from school?

Correct Answer:    
Mark Problem
24#
 
Single-Choice ( 1.0 marks) (No. in Group 24/27) Whole-Paper View eid: 834  R:W 74:74  Correct Percent: 50%  Difficulty: *****  
试卷已过期，处于只读浏览模式，无法保存作答
  A motorist travels 160 km at 80 km/h and 16 5 )x 9b2y3i8qqzc:6ubm/b+eq tr ivyk0 km at 100 km/h. What is the average speed of the motoq96t:y82qiybem+5v/ )qkb3zbx ci u rrist for this trip?

Correct Answer:    
Mark Problem
25#
 
Single-Choice ( 1.0 marks) (No. in Group 25/27) Whole-Paper View eid: 835  R:W 104:47  Correct Percent: 69%  Difficulty: *****  
试卷已过期，处于只读浏览模式，无法保存作答
  A motorist travels for 3.0 h at 80 km/h a,-1k 2ltsa+ fbo4 gb/jeyiar ;p1kdj8nd 2.0 h at 100 km/h. What is her average speek lsg1ir 4a ykpjoj, ; f-db1be/t+28ad for the trip?

Correct Answer:    
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Mark Problem
26#
 
Single-Choice ( 1.0 marks) (No. in Group 26/27) Whole-Paper View eid: 836  R:W 91:64  Correct Percent: 59%  Difficulty: *****  
试卷已过期，处于只读浏览模式，无法保存作答
  An airplane travels at 300 mi/h south for 2.00 ho)5(;7y*dc j0xvpm0b sha qe p.d r0dtq0yj1q and then at 250 mi/h north for 750 miles. What is the average speed for the trip?od0p 1 0q;(edd *hxpjstby.rcqm qv 7y5j0)a0

Correct Answer:    
Mark Problem
27#
 
Single-Choice ( 1.0 marks) (No. in Group 27/27) Whole-Paper View eid: 837  R:W 77:63  Correct Percent: 55%  Difficulty: *****  
试卷已过期，处于只读浏览模式，无法保存作答
  In a 400-m relay race the anchorman (the person who runs th-u , qil j39heokm iug.n5w3y-e 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 r ,5huonw. il9jug3 3i--em ykqunner 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?

Correct Answer:    
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Mark Problem
28#
 
Free-Response ( 1.0 marks) (No. in Group 1/7) Whole-Paper View eid: 10136  
试卷已过期，处于只读浏览模式，无法保存作答
第 2 题组 (共 7 题 7 分)
If one object has a greater speef 67s xiw.opqmtz (,l)d than a second object, does the first necessarily have af ow7pmq.tx (zsl)6 i, greater acceleration? Explain, using examples.
Correct Answer:    

Mark Problem
29#
 
Free-Response ( 1.0 marks) (No. in Group 2/7) Whole-Paper View eid: 10137  
试卷已过期，处于只读浏览模式，无法保存作答
Compare the acceleration of a motorcycle that accelerates from 80digc . mtd; mv4xdvw 66a/+n(d km/h to 90 km/h with the acceleration of a bicycle that accelerates from rest to 10 km/h igd+/dm; vmv6xi4wcn.(d6d t an the same time.
Correct Answer:    

Mark Problem
30#
 
Free-Response ( 1.0 marks) (No. in Group 3/7) Whole-Paper View eid: 10138  
试卷已过期，处于只读浏览模式，无法保存作答
Can an object have a northward v fv ,:pq.yoae3 piad;*elocity and a southward acceleration? Explain.
Correct Answer:    
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Mark Problem
31#
 
Free-Response ( 1.0 marks) (No. in Group 4/7) Whole-Paper View eid: 10139  
试卷已过期，处于只读浏览模式，无法保存作答
Can the velocity of an object be negative when its accel- eration is posqngmhic2 o-c6gss/ 66itive? What about vice versa? If yes, give examples in eacm6ih 6c-ss6c/gq2ogn h case.
Correct Answer:    

Mark Problem
32#
 
Free-Response ( 1.0 marks) (No. in Group 5/7) Whole-Paper View eid: 10140  
试卷已过期，处于只读浏览模式，无法保存作答
Give an example where both the velocity and acceleration are negatit bm 0tdwu2yxdp;539d vt6o j5ve.
Correct Answer:    

Mark Problem
33#
 
Free-Response ( 1.0 marks) (No. in Group 6/7) Whole-Paper View eid: 10141  
试卷已过期，处于只读浏览模式，无法保存作答
Can an object be increasing in s6-4a4jvi d ) iu2gpci+r*urlrpeed as its acceleration decreases? If so, give an exdri4 j lgru+)vu2r6*4ac pii-ample. If not, explain.
Correct Answer:    

Mark Problem
34#
 
Free-Response ( 1.0 marks) (No. in Group 7/7) Whole-Paper View eid: 10142  
试卷已过期，处于只读浏览模式，无法保存作答
Two cars emerge side by side from a tunnel. Car A is g32+e4u i . hprsf,a/ajj h/ovs0swo1traveling with a speed of 60 km/h and has an acceleration of 40 km/h/min. Car B has a speed of 40 km/h and has an acceleration of 60 kms e uhsr 2pw0 oso/ahj1fg.i,3+4/ajv/h/min. Which car is passing the other as they come out of the tunnel? Explain your reasoning.
Correct Answer:    

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