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PRACTICE：Science 10 April 17 in-class Practice

  Author: cwphysics    Total: 34 Marks  Marks Earned: _____________

User Name: No Login  Start Time: 25/04/17 08:15 End Time: this month 25 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 152:86  Correct Percent: 64%  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 anoths a+- pb5bb0 xum:ds/:a bnr 1.6cwzjler. Make a comparison between the displacement and the distance trav 0 bra6 /c:s zbbnm1.5+pw-usjlxdb: aeled.

Correct Answer:    
Mark Problem
2#
 
Single-Choice ( 1.0 marks) (No. in Group 2/27) Whole-Paper View eid: 783  R:W 191:57  Correct Percent: 77%  Difficulty: *****  
试卷已过期，处于只读浏览模式，无法保存作答
  When is the average vely)0u5inm sg0 d v5u.qmrxl o93ocity of an object equal to the instantaneous velocity?

Correct Answer:    
Mark Problem
3#
 
Single-Choice ( 1.0 marks) (No. in Group 3/27) Whole-Paper View eid: 784  R:W 151:97  Correct Percent: 61%  Difficulty: *****  
试卷已过期，处于只读浏览模式，无法保存作答
  A new car manufacturer adverto 35 p,mpf-ogxises that their car can go "from zero to sixty in 8 s". xom-3gp,opf5 This is a description of

Correct Answer:    
Mark Problem
4#
 
Single-Choice ( 1.0 marks) (No. in Group 4/27) Whole-Paper View eid: 785  R:W 170:66  Correct Percent: 72%  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 experkh2tlc k29+ lriences 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 131:92  Correct Percent: 59%  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 directj bgrcxnoq)/cq;9) y:ion) begins to slow down as it approaches a traffic light. Make acr qng:9 ;qb/xy)o)cj statement concerning its acceleration.

Correct Answer:    
Mark Problem
6#
 
Single-Choice ( 1.0 marks) (No. in Group 6/27) Whole-Paper View eid: 788  R:W 184:53  Correct Percent: 78%  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 movl uy982 g2bq)gucph 6rc9qi5u c6.yzying with a constant velocity. Make a statement concerning its acc y2gquc9.6)b9z ulhr6c2quyg y8i5p celeration.

Correct Answer:    
Mark Problem
7#
 
Single-Choice ( 1.0 marks) (No. in Group 7/27) Whole-Paper View eid: 789  R:W 133:126  Correct Percent: 51%  Difficulty: *****  
试卷已过期，处于只读浏览模式，无法保存作答
  If the velocity of an object is,-mrjm uei7n/ zero, does it mean that the acceleration is zero? Support your answer with an eer7mnuj,m -/i xample.

Correct Answer:    
Mark Problem
8#
 
Single-Choice ( 1.0 marks) (No. in Group 8/27) Whole-Paper View eid: 790  R:W 147:127  Correct Percent: 54%  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 cyggz o(b01y:t onstant? Support your answ0bo:g y(y g1tzer 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 163:77  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 wipw-5maj v-,fs th constant acceleration. Make a statement concerning its motion with respect to time-5a w -,mjfsvp.

Correct Answer:    
Mark Problem
10#
 
Single-Choice ( 1.0 marks) (No. in Group 10/27) Whole-Paper View eid: 792  R:W 141:113  Correct Percent: 56%  Difficulty: *****  
试卷已过期，处于只读浏览模式，无法保存作答
  Can an object have inq60hasbmuu;k n 9b3w jx*sgn r,d61 s-creasing speed while its acceleration is decreasing? Support your answe -assm ;6j dqux6bh03 unn9sgwbk1,*r r with an example.

Correct Answer:    
Mark Problem
11#
 
Single-Choice ( 1.0 marks) (No. in Group 11/27) Whole-Paper View eid: 793  R:W 92:112  Correct Percent: 45%  Difficulty: *****  
试卷已过期，处于只读浏览模式，无法保存作答
  Suppose a can, after z.t(d1 af 7tphq(o d0ban initial kick, moves up along a smooth hill of ice. Make a statement concerning its acceleration ho1za( dd(.0tpfqb7t.

Correct Answer:    
Mark Problem
12#
 
Single-Choice ( 1.0 marks) (No. in Group 12/27) Whole-Paper View eid: 794  R:W 156:99  Correct Percent: 61%  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 equal * 2mmgzon8dqm0)4 cyo e*qq 5h1nnle :to the average of the object's initial and final velocith5g:qmym *0 14nmonqdlcen*)eqz 82oy?

Correct Answer:    
Mark Problem
13#
 
Single-Choice ( 1.0 marks) (No. in Group 13/27) Whole-Paper View eid: 795  R:W 199:46  Correct Percent: 81%  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 atevs 8q.l4px)uh8 / :y q*qoxuw rest. They both accelerate at the same rate. However, object A accelerates for twice the time aq/qp * y.ox84)xluwq:8e ushvs 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 194:31  Correct Percent: 86%  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 y*3 /jz4sht;uydow dj*6+tc k north and then 11.0 m south. Find both the distance traveled and the magnitude of the displacem;d6 ysd c/4k **yz3otwtu+ jjhent vector.

Correct Answer:    
Mark Problem
15#
 
Single-Choice ( 1.0 marks) (No. in Group 15/27) Whole-Paper View eid: 823  R:W 153:64  Correct Percent: 71%  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 30 km/h in still water. How long will it take to move 12pltq+5*okzz5 km upstream in a river f +qt5ozpl5z *klowing 6.0 km/h?

Correct Answer:    
Mark Problem
16#
 
Single-Choice ( 1.0 marks) (No. in Group 16/27) Whole-Paper View eid: 825  R:W 154:54  Correct Percent: 74%  Difficulty: *****  
试卷已过期，处于只读浏览模式，无法保存作答
  What must be your averaghng0i9a3vi 5ozs) s. fe speed in order to travel 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 178:63  Correct Percent: 74%  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.s v)snm: qr;4biuv9osq74l 2x/qal,u 0 km) in 2 hours and 57 min. What is the average speed ofxv /uilsv9u2o qq4qarl,:m 7sn; b 4)s the runner in m/s?

Correct Answer:    
Mark Problem
18#
 
Single-Choice ( 1.0 marks) (No. in Group 18/27) Whole-Paper View eid: 827  R:W 158:32  Correct Percent: 83%  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 kmf)ii4vb+ jop7h,qng) m3ds t5?

Correct Answer:    
Mark Problem
19#
 
Single-Choice ( 1.0 marks) (No. in Group 19/27) Whole-Paper View eid: 829  R:W 167:73  Correct Percent: 70%  Difficulty: *****  
试卷已过期，处于只读浏览模式，无法保存作答
  If you are driving 72 km/h along a straight road and you loow9(rj9/ rps cdk to the side for 4.0 s, how far do you travelc drws 9p(/9jr 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 118:167  Correct Percent: 41%  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 (400 m), in 100 s, your 8vbfl z*9yz w)average velocity i wvzz8b9y* )fls

Correct Answer:    
Mark Problem
21#
 
Single-Choice ( 1.0 marks) (No. in Group 21/27) Whole-Paper View eid: 831  R:W 137:96  Correct Percent: 59%  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 trzy07rvqgk d5 p d8(hm5avels 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. Whahq 08r5z(7k5dv dp mygt 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 138:108  Correct Percent: 56%  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 km soujg2+ zrf ttl+:th, 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'j:2 +zftlr+ tgs average velocity?

Correct Answer:    
Mark Problem
23#
 
Single-Choice ( 1.0 marks) (No. in Group 23/27) Whole-Paper View eid: 833  R:W 169:76  Correct Percent: 69%  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 5 l(*n8v9lk ,zu24rue/kxj yefs w2td.t 1p+ub 5 mi/h for 110 miles. It then starts to snow and you slow to 35 mi/h. You an t+ewub28* 1rk4 ,ve lpkdl2z ujs9fxt/.y( urrive 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 147:86  Correct Percent: 63%  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 5*po zhsl4 j2bat 80 km/h and 160 km at 100 km/h. What is the average speed of the motorist for this trip*pbsjzo 45l 2h?

Correct Answer:    
Mark Problem
25#
 
Single-Choice ( 1.0 marks) (No. in Group 25/27) Whole-Paper View eid: 835  R:W 174:51  Correct Percent: 77%  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 and 2.0ggir)lwj* *wm4d1 j5 h h at 100 km/h. What is her averh gr)jjldw5gi1 * wm4*age speed for the trip?

Correct Answer:    
Mark Problem
26#
 
Single-Choice ( 1.0 marks) (No. in Group 26/27) Whole-Paper View eid: 836  R:W 164:68  Correct Percent: 71%  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 h and then zj *h373ms,hy1zwihhtv 7i5 s;-z.6 zv cf tmqat 250 mi/h north for 750 miles. What is the avzmhvq 3tzh yh 75zvih*-zcjtf m;3swi1 , 7s6.erage speed for the trip?

Correct Answer:    
Mark Problem
27#
 
Single-Choice ( 1.0 marks) (No. in Group 27/27) Whole-Paper View eid: 837  R:W 146:76  Correct Percent: 66%  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 the last 100 mj6 ((ee +ywepu )y;yu3yjipg+) for team A can run 100 m in 9.8 s. His rival, the anujepy(yj+py wg+i ;y3) 6ue(echorman 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 the team A runner not lose the race?

Correct Answer:    
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 speed than a s9m. f:k.b e+tdfjt )rmvvdxx-e+ p rw:k 8h*:second object, does the first necessarily have a greater accelera v8r+h k .x:f.+pdbrvjdwt)e*9xs:kf:emtm- tion? 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 80 e /3r aq 57ihvbb+zmn-km/h to 90 km/h with the acceleration of a bicycle that accelerates from rest to 10 km/h in the same tim-me73vqn5a h /rzbib +e.
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 velocity and a southward acceleratinqqtc;o3 yy ft+o;6/gz) ljf,zz (2ekon? Explain.
Correct Answer:    

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 poa;b gwgxu lf1: ,k1n*ositive? What about vice versa? If yes, give examples in e ;g xng ow1*u:akfl,b1ach 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 botgrxq gjqpgy4f 652 pxbs 5utnp;:v)58h the velocity and acceleration are negative.
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 speed as its acc36v(qhb,b.bng l re5 peleration decreases? If so, give an example. If not, explainlq b( 5 3p6gbev.,bhrn.
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 traveling with a speed ofdrb)ow,, :n ft 60 km/h and has ot:w ),fd,bnr an acceleration of 40 km/h/min. Car B has a speed of 40 km/h and has an acceleration of 60 km/h/min. Which car is passing the other as they come out of the tunnel? Explain your reasoning.
Correct Answer:    

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