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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 wrtq y za;*x)j -snlr(/d8x)eanother. Make a comparison between the displacement and the dis q8a /sw;rn*y)lr-dt exzxj( )tance traveled.

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 objec)h)*0x21lnm gxzrwbdt 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 advertises that their car can go "from zero to sixty in 8ok2 g rdk32qa( s". This is a descrip 2dkrkg o3qa(2tion 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 axismi)0i:f) ujrhkf cm(uc7,kd 3 experiences 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 (-xx noowef5(25q alx82vv4q lq/ direction) begins to slow down as it approaches a traffic light. Make a stateovx55 x(lq ov8fnw2qq 2ela/ 4ment 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. M:8n2x bxd)p/ot s5rl dake a statement concerning its acceler2ot 5s xrxbpdn/ld )8:ation.

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 it mean that the accelerationpf gb71s/xorb3e ug*4jw c2e)1;gu lc is zero? Support your answer with an examplelcx/1f*owbbg 3 g;g e42) uprcsu17je.

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 changevm- h fde 2e*bjr*te7g4 k7jrwi7a6b5 direction when its acceleration is constant? Support your ard ae5bvweh 62j-t*7 rjmf g77ekbi4*nswer 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 with constant acc9c ih3mjpnq r8ec..gd4q3;x2mjc bk 7eleration. Make a statement concerning its motion with respect m9;4cr.i.3gkhm3n qq c2j xde78pj bc 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 its acceleration is decreasing?pj3 u j8n+7hl7k z4dfo Support your answer with h of j d47j7+8ukzlnp3an 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 an initial kick, moves up along a smooth hill ofh2qa b/ nws4,s ice. Make a statement concerning its acceless4 q2an/b, hwration.

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 to the average 8ve9 . wl*w;7hvqq fmwof the object's initial and final v;q9vw .wlvqe7mf*w8helocity?

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 at rest. They both accelerate at the same rate. l4 r o(6osya *yrlm c*1(6:njvcz.dix However, object A accelerates for twice the time as object B.dir.:**vsoo(l xamn6r l6 czyc1j(4y 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 the distance tg (cek rw4mcs4:lpb7/raveled agw:4 me7br4ls k ccp/(nd the magnitude 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 water. How long will it take to move 12+6p7 fvb eygcu(e 8xb3 km upstream in a river fl3e6cg7b 8bue yp(fv+xowing 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 sexkkfm14im 1bw3n mz3u6x.1 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 4vg-x1c2i dr7/luw ig*2.0 km) in 2 hours and 57 min. What is the averac vuri -/dg1 li72w*gxge speed of 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 k;c yahjp z( :g03ymi,wm?

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 al t.vpqv, u0c5song a straight road and you look to the side for 4.0 s, how far do p cvqs. ,uvt50you 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 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 l, f+l1dc8lx9y3qsaim .d)eu foop around an outdoor track (400 m), in 100 s, your average veloc,si f18)+elfq.yud3 md lcax9ity 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 travels 1.0 km south, then 1.0 kmc(,mx 0 wm8gwb east, then 1.0 km north, then 1.0 km west to return to its starting point(wmwg c 0m8bx,. This trip 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 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 tregv*5 vqd*;sgq *1h:yf6k nnhavels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km wes1kyq evd6hfq:gv;* hng *5*s nt to return to its starting point. This trip takes 45 min. What was 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 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 5o1hqiq4lvc *fh7x3 sschool at 55 mi/h for 110 miles. It then starts to snow and you slow to 35 mivhf5o 1l73qsc4 *hxqi/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 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 80 km/h and 160 km ate12j 8/hngeqd l 0tthorl5w(. 100 km/h. What is the average speed of the egl qtoe2w/h t1.8nhj05(rdl motorist 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 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 2.0 h at 1zifxp z *x((95pol(8ltsc ;r g00 km/h. What is her average speeozlxpxrc si (*5gt8l;(f z9p(d 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 at 250 mi/h north fojnp;7z9q a;m. 6kpoj( j1 f.jdaekw v5r 750 miles. Whp aw67(.jekn f.kpaj5; jod1j; v m9zqat 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 gyq,4xs c ax*l r;pw.;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 ;gyx4 * wl sxp.ra,;qcwhen 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 second objej+ w/yh)qaa) 8jh(t0fw/h hh pct, does the first necessarily have a greater acceleration? Explain, using exam8jwa hqy(jt/+h0 w)/h) ha hfpples.
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 kxyw,o 5s smf2l;r:o4dn i -wq.m/h to 90 km/h with the acceleration of a bicycle 24s:fnm- ;dyi.w roxwlq,os5that 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 southward6va,y fuh/ /uo 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 negative when its a twre/:c-g/ naccel- eration is positive? What about vice versa? If yes, give examples in eac/:e wcgar/n-t 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 accelerat mq* 2piw,)l2tv/alr69fni (m5uzba- o(pm ulion 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 in2s v kv/*pi;mvi0bl :t speed as its acceleration decreases? If so, give an t;/vv* 0k2smi :ilpbvexample. 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 uw/ 1eovo imun79v6b, by 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 othm/6u n9o weoivub71 v,er as they come out of the tunnel? Explain your reasoning.
Correct Answer:    

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