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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 travetj21pq2r , ofu)yowodod1z *dz,1,chls from one point in space to another. Make a comparison between the displacement and the distance travehr)ozf , *d2z,cudwp2j,qo1ty 1o od1led.

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 velocity of an object equal to the instau1 z 615*epwm oxi9mqantaneous 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 advertises that their ;;s(,daufu tdcvkwlvv/1- ;jcar can go "from zero to sixty in 8 s".w;/vv v - a ckluu1;fd(,;tsdj 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 experience.tq6w8 cb lip2s 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 direction) begins to slow dow;3 k1 1:ihkr1 zjuwjnqn as it approaches a traffic lighq n1jk:w 3 ;11jkuihrzt. Make a 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 moving with a constant velocity. Make a statement colbo6wi,pinzif+/k g1;3xo g 8ncerning its acceler 3zx;l/16po,igo kwinbg+ f 8iation.

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 zero, does ik1 y bi3gu.y7pt mean that the acceleration is zero? Support your answer with an example.7k3 y1i.uygbp

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 dir4af1mj *qnm -cection when its acceleration is constant? Support you jc41-mf a*mnqr answer 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 is78-vfhs iaoem4rq hjfjq517f z * a-8k moving with constant acceleration. Make a statement concerning its motion with r8*-f78f zvj 7kaq4hq 1eioar-jshmf5 espect to time.

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 increasing speed while i6fk7q h2runu,z,i *oets acceleration is decreasing? Support your answer with an example.o 6,n 2,fur*qiz ukh7e

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 an initial kick, moves up along a smoot ampuzk. ae9ucn:25a/5od 3iyqz a)c ;f/+eiwh hill of ice. Make a statement concerningak/ +efz n wcci3au5em2z a dpoi9q;a.y :5)u/ its acceleration.

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 averagl-*v)q yhh b; u3uhap5e velocity equal to the average of the object's initial an qbhu5l;hvpyh3a u )-*d final velocity?

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 sd-n c)lrsz18izmfx 1n ;rrq/:tart at rest. They both accelerate at the same rate. However, object A accelerates :c rn /rlqr8z m11sxi-d f;)nzfor 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 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 north and then 11.0 m south. Find both w+l irv):c*av the distance traveled and the magnitu +)wv:vr*acl ide of the displacement 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 waterqz u-gq)*61 q xl/wdsp. How long will it take to move 12 km upstream in a river f1lusdpw qq-zg /q x*)6lowing 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 average speed ,o9m*sc.tnf o 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 (approximatq bfol j4d- 2o2x/sft :-0nmcwely 42.0 km) in 2 hours and 57 min. What is the average speed of the runner in m/scb -nlw0ox-oj2s4:2q/df mtf ?

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 takg+1b ):add* az/5 3qnrbq. bbmrqa8p he for it to travel 400 km?

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 look to the maus m7nm6ur2l 286qyi bn7oii(bq ,q )l6 6ulside for 4.0 s, how far do you trave2nqa(2luyi6mniq) 6s,7bql m8 6lu6m bri7uol 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 am(mg;sud 03g pverage velocit(ggpm ; ds0um3y is

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 travpp 3jr i:.z)a oc.dai.0v6bl kels 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 p.la)cvi :3brz.a0 jdpi . ko6speed?

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 south, then 87 gy kzbb+rc-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 bearz+8 7-gbcy rbk'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 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 0hcn2cg ;)p8 ce97uxo, obm.nirxna*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 driving 4 houo am8n09rx*2h) ; ep.unc cgo7,nicb xrs 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 at 8 wn(i, +lysjhae: /0yi0 km/h and 160 km at 100 km/h. What is the average speed of the motorist for thyi:,j lwn /hyesia0(+is trip?

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 forcktw(eu-sio;9e h53 p 3.0 h at 80 km/h and 2.0 h at 100 km/h. What is her average s3h;ws5u c(pik-9e etopeed 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 ab6q u7.l.j66 iyarvcdx5yl .kn) jt )8,vskqlnd then at 250 mi/h north for 75la j xq.tclu qn,)85 dk ky)lyb7s6.6 jrv.i6v0 miles. What is the average 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 m) fdqi6b,8lb j 8ror 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 th8 6qli8 ,jbdrbe 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 - c0yqh/zz:n*zmjz r0greater speed than a second object, does the first necessarily have a greater acceleration? Expln cqz* zrh0my:0jz -z/ain, 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 kmz6dwgc2 e0y/bh xsb/ 9/h to 90 km/h with the acceleration of a bicb9wshb/c 2g6 x zy/d0eycle that accelerates from rest to 10 km/h in 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 velocity and a southvxa 4g0nn9fk ++7rgliward acceleration? 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 br( ika6ltq;hu ; .b1hnegative when its accel- eration is positive? What about vice versa? If yes, give examples in elaq;h;6kt rhbu1 .b(i ach 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 6knp/wu 8hnl+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 acceleration decreases? If s)n(6a, 3je 6flhlkqjs2 mri 3to, give an example. If not, explain.q 66 ej2, asfn33hri(m l)ktlj
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 bykru.)cqyx 8+) oxbztm2(cmg - side from a tunnel. Car A is traveling 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 km/h/min. Which car is passing the other as they come out of qm zgcmto(x-)u+ cxby8.r)2kthe tunnel? Explain your reasoning.
Correct Answer:    

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