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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 sxa 4jbs)c4 r fq)*fj7one point in space to another. Make a comparison between the displacement and the distance travel 7faj c))rs4s b*4jxqfed.

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 velocityecrfw /q7/8 bl 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 advertises that thm 9fmccp+-- qpy2s2( vkwm sm9eir car can go "from zero to sixty in 8 s". Thywm cpmqms(2ps -ck9m-2 v9+fis 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 exp4osw4l5 nqxl:dgf+go /- (meweriences 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 direc2eqa x;68tqr0 r;okk ution) begins to slow down as it approa 2qka0 ru8;kx;6qte orches a traffic light. 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 +6w3nfl t jk-rmoving with a constant velocity. Make a statement concerning its k lwr -3jnft6+acceleration.

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 acceleration d 5/:b2psdajk is zero? Support you/spjd kdb5: 2ar 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 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 accelel ;zi5my;xm+d ration is constant? Support your answer with anymdzm+;x; i 5l 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 xxuo u 8qvj-fu:2/1 wsmoving with constant acceleration. Make a statement concerning its motion wit:j1u2w qfv- / uuso8xxh 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 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 acce/s8g*e cp-r) btzxyzk.muv*3 leration is decreasing? Support your answer with an example.rg/xt kc)z.uvb m*z3yp s-8*e

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 of ice. 7/o.can5lc rvMake a statement concerning its oc 5rcan. 7vl/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 average velocity equal to the average of the object's inc9xgsd s, bii6pgi pq 1028je/-0 9wzxgwyhh( itial and f0es (-wp12, xb d8ywigi0/igjhh9 qx6c9pgsz inal 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 start at rest. They both acceleratz:fs b)nh9/jkq49ncrit / d2ue at the same rate. However, object A accelerates for twice the time as object B. What is the final sntbc//h: q9 2fu)r4d z9nkjispeed 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. Finqn m*y41eoj m:3 wwj9vd both the distance traveled and the magnitude of the displacement v n:ymj3w 4 *v9jeo1qwmector.

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 ixvh . q;93r o1z50i: gxsaggztake to move 12 km upstream in axg.gqrs1xi3i5o 0z g: 9a;hzv river flowing 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 in order to travel 350 km in 5.1 mf5tv3amyf h)dz7 e.6f;wxt 05 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 )553mh36w kiw h e5itap9grcj .njh3e42.0 km) in 2 hours and 57 min. What is the average speed of the runnr e3pm5)heih i gh9ak5w35n.jt6 3cwjer 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 d3h /a /lwztbq* :z c9b:4ndabooes it take 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 s8nhts dnxl9k+wrt;o/ oul59h;t ,1q yide for 4.0 s, how far do you travel during this inatt9dlxh hs+tt1 l nu/otw;q;nkr85y,9oentive 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 complet, u,er( xvogm5e loop around an outdoor track (400 m), in 100 s, your average velocit5(rxg eovu, m,y 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 Nor +3 ( ylebe;lb4flnpkt9z *5hjth Pole. It travels 1.0 km south, then 1.0 km east, then 1.0 km north9ylnkl*et hp34zf5 ;lbe +b(j , then 1.0 km west to return to its starting point. 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 Noldu(4lly - wo8rth Pole. It travels 1.0 km south, then 1.0 km east, then 1.0 km north, llywd8-(l o4 uthen 1.0 km west 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 os9 .edtii 8k2a 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 afteri2 sk odet.98i 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 fe0 zbv0 2/pdyat 80 km/h and 160 km at 100 km/h. What is the average speed of the mot yv 0/bzef2dp0orist 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 fmoq.d 0+4 3s lyb3ygcqor 3.0 h at 80 km/h and 2.0 h at 100 km/h. What is her average speed for thec+yso. 343y bg0qqm dl 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 nortipy2msvrj bey-x p i3z(.8c5 )h for 750 miles. What is the average speed i v 23py)c8y5zr ebm-ipx(sj .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 runs2lyl f8zbj8e7) /l v6z5zyndt the last 100 m) for team A can bn7lll6 j5z 8ye v8f 2tz)yd/zrun 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 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 object, does the firshyb,( ol-u/j 92svy -xheix4nt necessarily habinvyyou4l-e, x h- hs9xj/2( ve a 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 accel ) 2.1byntjr+huhk5 a4+h rnfuerates from 80 km/h to 90 km/h with t +y rr+bu5hjh k1nu4 .ath)f2nhe acceleration of a bicycle 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 southward accelerat6g v6wm,liqte ts01 i6ion? 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 1mzfbgz -k ,l*,u j/qaobject be negative when its accel- eration is positive? What about vice versa? If yes, - ,/u*km z alqzjbfg1,give examples in each 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 nega *u*k(*xbe ycmtive.
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 so, gvgl240akbbw , ive an exa av40b,w2l kgbmple. 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 gkrt85im.x 6o traveling with a speed of 60 km/h and has an acceleration of 40 km/h/min. Car B has a 56o x.rgmk8itspeed 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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